epos-con.f

CMSSW/GeneratorInterface/ReggeGribovPartonMCInterface/src/epos-con.f

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1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323	`c-----------------------------------------------------------------------` `subroutine conaa(iret)` `c-----------------------------------------------------------------------` `c determines interaction configuration` `c-----------------------------------------------------------------------` `include 'epos.inc'` `include 'epos.incems'` `include 'epos.incsem'` `include 'epos.incpar'` `common/geom/rmproj,rmtarg,bmax,bkmx` `common/nucl3/phi,bimp` `common /cncl/xproj(mamx),yproj(mamx),zproj(mamx)` `* ,xtarg(mamx),ytarg(mamx),ztarg(mamx)` `common/cfacmss/facmss` `double precision yyrmax` `common/scrangle/ phik3(kollmx),thetak3(kollmx)` `call utpri('conaa ',ish,ishini,4)` `iret=0` `c initialisations` `c ---------------` `vel=tanh(ypjtl-yhaha)+tanh(yhaha)` `c determine phi, bimp, coll, iproj, itarg, x/y/zproj, x/y/ztarg` `c ---------------------------------------------------------------` `if(iokoll.eq.1)then` `koll=matarg` `do k=1,koll` `do n=1,4` `coord(n,k)=0.` `enddo` `enddo` `bimp=0` `phi=0` `xproj(1)=0` `yproj(1)=0` `zproj(1)=0` `lproj(1)=koll` `lproj3(1)=0` `do k=1,koll` `bij=bkmxsqrt(rangen())` `bk(k)=bij` `iproj(k)=1` `itarg(k)=k` `phi=2.pirangen()` `xtarg(k)=bijcos(phi)` `ytarg(k)=bijsin(phi)` `ztarg(k)=0` `ltarg(k)=1` `kproj(1,k)=k` `ktarg(k,1)=k` `ltarg3(k)=0` `ktarg3(k,1)=0` `kproj3(k,1)=0` `if(iscreen.ne.0.and.bij.le.bkmxndif)then` `if(zbrmax.le.0..or. bij.lt.zbcutx+zbrmaxrangen())then` `lproj3(1)=lproj3(1)+1` `ltarg3(k)=1` `kproj3(1,lproj3(1))=k` `ktarg3(k,1)=k` `endif` `endif` `enddo` `elseif(maproj.eq.1.and.matarg.eq.1)then` `b1=bminim` `b2=amin1(bkmx,bmaxim)` `if(b1.gt.b2)call utstop('conaa: bmin > bmax&')` `bimp=sqrt(b1b1+(b2b2-b1b1)rangen())` `koll=1` `do n=1,4` `coord(n,1)=0.` `enddo` `bk(1)=bimp` `iproj(1)=1` `itarg(1)=1` `phi=2.pirangen()` `xproj(1)=bimpcos(phi)` `yproj(1)=bimpsin(phi)` `zproj(1)=0` `xtarg(1)=0` `ytarg(1)=0` `ztarg(1)=0` `lproj(1)=1` `ltarg(1)=1` `lproj3(1)=1` `ltarg3(1)=1` `kproj3(1,1)=1` `ktarg3(1,1)=1` `kproj(1,1)=1` `ktarg(1,1)=1` `else` `call conxyz('p',mamx,xproj,yproj,zproj,ypjtl-yhaha)` `call conxyz('t',mamx,xtarg,ytarg,ztarg,yhaha)` `bx=0` `by=0` `if(maproj.gt.0)then` `if(bimevt.lt.0)then` `b1=bminim` `b2=amin1(rmproj+rmtarg,bmaxim)` `if(b1.gt.b2)call utstop('conaa: bmin > bmax&')` `bimp=sqrt(b12+(b22-b1*2)rangen())` `if(nbarray.gt.0)bimp=barray(mod(nrevt,nbarray)+1)` `if(jpsi.gt.0)then` `bimp=b1+(b2-b1)(float(mod(nrevt,12))+rangen())/12.` `bimevt=bimp` `endif` `phi=phimin+rangen()(phimax-phimin)` `else` `phi=phievt` `bimp=bimevt` `endif` `bx=cos(phi)bimp` `by=sin(phi)bimp` `endif` `if(jpsi.lt.0)then !modify b` `bx=xtarg(1)` `by=ytarg(1)` `endif` `if(maproj.eq.0)goto1000` `koll=0` `do i=1,maproj` `lproj(i)=0` `lproj3(i)=0` `enddo` `do j=1,matarg` `ltarg(j)=0` `ltarg3(j)=0` `enddo` `do 12 i=1,maproj` `do 11 j=1,matarg` `if(jpsi.lt.0.and.ztarg(j).le.ztarg(1))goto11` `bij=sqrt((xproj(i)+bx-xtarg(j))2+(yproj(i)+by-ytarg(j))2)` `if(ish.ge.7)write(ifch,)'i_p:',i,' i_t:',j,' b_ij:',bij` `if(bij.gt.bkmx)goto 11` `koll=koll+1` `if(koll.gt.kollmx)call utstop('conaa: kollmx too small&')` `bk(koll)=bij` `bkx(koll)=xproj(i)+bx-xtarg(j)` `bky(koll)=yproj(i)+by-ytarg(j)` `iproj(koll)=i` `itarg(koll)=j` `lproj(i)=lproj(i)+1` `ltarg(j)=ltarg(j)+1` `kproj(i,lproj(i))=koll` `ktarg(j,ltarg(j))=koll` `phik3(koll)=0.` `thetak3(koll)=0.` `if(iscreen.ne.0.and.bij.le.bkmxndif)then` `if(zbrmax.gt.0..and.bij.gt.zbcutx+zbrmaxrangen())goto 11` `lproj3(i)=lproj3(i)+1` `ltarg3(j)=ltarg3(j)+1` `kproj3(i,lproj3(i))=koll` `ktarg3(j,ltarg3(j))=koll` `c define angle for anti-shadowing` `if(abs(bky(koll)).gt.1.e-6)then` `if(abs(bkx(koll)).gt.1.e-6)then` `phik3(koll)=atan(bky(koll)/bkx(koll))` `else` `phik3(koll)=sign(0.5pi,bky(koll))` `endif` `elseif(bkx(koll).lt.0.)then` `phik3(koll)=pi` `endif` `if(bk(koll).gt.0.)then` `thetak3(koll)=atan(bglaubx/bk(koll))` `else` `thetak3(koll)=0.5pi` `endif` `endif` `11 continue` `12 continue` `do k=1,koll` `do n=1,4` `coord(n,k)=0.` `enddo` `enddo` `endif` `if(ish.ge.3)write(ifch,)'koll=',koll` `if(koll.eq.0)goto 1001` `c determine coord` `c ---------------` `do kl=1,koll` `i=iproj(kl)` `j=itarg(kl)` `dist=ztarg(j)-zproj(i)` `coord(1,kl)=(xproj(i)+xtarg(j))0.5` `coord(2,kl)=(yproj(i)+ytarg(j))0.5` `coord(3,kl)=(zproj(i)+ztarg(j))0.5` `coord(4,kl)=dist/vel` `enddo` `if(iscreen.ne.0)call CalcScrPair(bimp)` `!~~~~~redefine energy in case of imposed radial flow~~~~~~~~~~~~~~~~` `yrmaxi=max(0.,yradmx+yradmilog(1.+engy/sqrt(float(koll))))` `if(yrmaxi.gt.1e-5)then` `yyrmax=dble(yrmaxi)` `fradflii=sngl(1d0/` `& ((sinh(yyrmax)yyrmax-cosh(yyrmax)+1d0)/(yyrmax*2/2d0)))` `else` `fradflii=1.` `endif` `if(ish.ge.3)write(ifch,)'yrmaxi=',yrmaxi` `c exit` `c ----` `1000 continue` `if(ish.ge.5)then` `write(ifch,)'ia,x/y/zproj:'` `do mm=1,maproj` `write(ifch,)mm,xproj(mm),yproj(mm),zproj(mm)` `enddo` `write(ifch,)'ia,x/y/ztarg:'` `do mm=1,matarg` `write(ifch,)mm,xtarg(mm),ytarg(mm),ztarg(mm)` `enddo` `write(ifch,)'iret',iret` `endif` `call utprix('conaa ',ish,ishini,4)` `return` `1001 continue !iret=1 causes redo of whole collision` `iret=1` `if(ish.ge.3)then` `write(ifch,)` `write(ifch,)'**** subroutine conaa:'` `write(ifch,)'**** no nucleon pair found --> no interaction'` `write(ifch,)` `endif` `goto 1000` `end` `c-----------------------------------------------------------------------` `function frdmzcut(b)` `c-----------------------------------------------------------------------` `c determines interaction configuration` `c-----------------------------------------------------------------------` `include 'epos.inc'` `include 'epos.incpar'` `frdmzcut=zbcutxexp(-(brangen()))` `c frdmzcut=zbcutxrangen()` `c bdum=b` `return` `end` `c-----------------------------------------------------------------------` `subroutine CalcScrPair(b)` `c-----------------------------------------------------------------------` `c determines interaction configuration` `c-----------------------------------------------------------------------` `include 'epos.inc'` `include 'epos.incems'` `include 'epos.incpar'` `common/scrangle/ phik3(kollmx),thetak3(kollmx)` `logical lascr(kollmx),cont` `c order pairs for splitting as a function of b` `c ---------------` `do i=1,maproj` `if(lproj3(i).gt.1)then` `do l=2,lproj3(i)` `m=l` `100 continue` `kp=kproj3(i,m-1)` `kl=kproj3(i,m)` `if(bk(kl).lt.bk(kp))then` `kproj3(i,m-1)=kl` `kproj3(i,m)=kp` `m=m-1` `if(m.gt.1)goto 100` `endif` `enddo` `endif` `enddo` `do j=1,matarg` `if(ltarg3(j).gt.1)then` `do l=2,ltarg3(j)` `m=l` `200 continue` `kp=ktarg3(j,m-1)` `kl=ktarg3(j,m)` `if(bk(kl).lt.bk(kp))then` `ktarg3(j,m-1)=kl` `ktarg3(j,m)=kp` `m=m-1` `if(m.gt.1)goto 200` `endif` `enddo` `endif` `enddo` `if(koll.gt.1)then` `c Define anti-shadowing as a consequence of geometrical screening of` `c nucleons at large b by the one at small b` `c Projectile` `c Check phi not to be in the range of a nucleon with smaller b` `do i=1,maproj` `if(lproj3(i).gt.1)then` `kl=kproj3(i,1)` `lascr(kl)=.true.` `do 300 l=lproj3(i),2,-1` `kl=kproj3(i,l)` `lascr(kl)=.true.` `if(bk(kl).ge.frdmzcut(b))then` `do m=1,l-1` `km=kproj3(i,m)` `if(kl.ne.km.and.bk(km).ge.frdmzcut(b)` `& .and.phik3(kl).ge.phik3(km)-thetak3(km)` `& .and.phik3(kl).le.phik3(km)+thetak3(km))then` `lascr(kl)=.false.` `goto 300` `endif` `enddo` `endif` `300 continue` `endif` `enddo` `c suppress screened pair from the list` `do i=1,maproj` `if(lproj3(i).gt.1)then` `do l=1,lproj3(i)` `kl=kproj3(i,l)` `enddo` `endif` `enddo` `do i=1,maproj` `if(lproj3(i).gt.1)then` `n=2` `cont=lproj3(i).gt.1` `do while(cont)` `l=lproj3(i)` `kl=kproj3(i,l)` `c suppress end of the list in order to have the last pair active` `do while(.not.lascr(kl).and.l.gt.1)` `kproj3(i,l)=0` `lproj3(i)=lproj3(i)-1` `l=lproj3(i)` `kl=kproj3(i,l)` `enddo` `cont=lproj3(i).gt.n` `if(cont)then` `c compress list` `kn=kproj3(i,n)` `if(.not.lascr(kn))then` `m=lproj3(i) !last pair always active` `km=kproj3(i,m)` `kproj3(i,n)=km` `kproj3(i,m)=0` `lproj3(i)=lproj3(i)-1` `endif` `endif` `n=min(lproj3(i)-1,n)+1` `cont=lproj3(i).ne.n` `enddo` `endif` `enddo` `c Target` `c Check phi not to be in the range of a nucleon with smaller b` `do j=1,matarg` `if(ltarg3(j).gt.1)then` `kl=ktarg3(j,1)` `lascr(kl)=.true.` `do 400 l=ltarg3(j),2,-1` `kl=ktarg3(j,l)` `lascr(kl)=.true.` `if(bk(kl).ge.frdmzcut(b))then` `do m=1,l-1` `km=ktarg3(j,m)` `if(km.ne.kl.and.bk(km).ge.frdmzcut(b)` `& .and.phik3(kl).ge.phik3(km)-thetak3(km)` `& .and.phik3(kl).le.phik3(km)+thetak3(km))then` `lascr(kl)=.false.` `goto 400` `endif` `enddo` `endif` `400 continue` `endif` `enddo` `c suppress screened pair from the list` `do j=1,matarg` `if(ltarg3(j).gt.1)then` `n=2` `cont=ltarg3(j).gt.1` `do while(cont)` `l=ltarg3(j)` `kl=ktarg3(j,l)` `c suppress end of the list in order to have the last pair active` `do while(.not.lascr(kl).and.l.gt.1)` `ktarg3(j,l)=0` `ltarg3(j)=ltarg3(j)-1` `l=ltarg3(j)` `kl=ktarg3(j,l)` `enddo` `cont=ltarg3(j).gt.n` `if(cont)then` `c compress list` `kn=ktarg3(j,n)` `if(.not.lascr(kn))then` `m=ltarg3(j) !last pair always active` `km=ktarg3(j,m)` `ktarg3(j,n)=km` `ktarg3(j,m)=0` `ltarg3(j)=ltarg3(j)-1` `endif` `endif` `n=min(ltarg3(j)-1,n)+1` `cont=ltarg3(j).ne.n` `enddo` `endif` `enddo` `endif` `end` `c-----------------------------------------------------------------------` `subroutine xGeometry(iii)` `c-----------------------------------------------------------------------` `include 'epos.inc'` `include 'epos.incems'` `include 'epos.incsem'` `common/xgeom/nnn,naa(kollmx),nbb(kollmx)` `character5 fmt1,fmt2` `if(iii.eq.0)then` `do k=1,kollmx` `naa(k)=0` `enddo` `nnn=0` `elseif(iii.eq.1)then` `ngl=0` `do k=1,koll` `r=bk(k)` `if(r.le.sqrt(sigine/10./pi))ngl=ngl+1` `enddo` `if(ngl.ne.0)then` `nnn=nnn+1` `naa(ngl)=naa(ngl)+1` `endif` `elseif(iii.eq.2)then` `if(xpar1.eq.0..and.xpar2.eq.0.)then` `print,'---------- xGeometry -----------------------'` `return` `endif` `x1=1-0.01xpar2` `x2=1-0.01xpar1` `kmx=0` `nbb(1)=naa(1)` `do k=2,kollmx` `if(naa(k).ne.0.)kmx=k` `nbb(k)=nbb(k-1)+naa(k)` `enddo` `k1=0` `k2=0` `do k=1,kmx` `x=nbb(k)/float(nnn)` `if(x.lt.x1)k1=k` `if(x.lt.x2)k2=k` `enddo` `k1=k1+1` `k2=k2+1` `x=0` `av=0` `su=0` `p1=0.` `p2=0.` `do k=1,kmx` `xb=x` `x=nbb(k)/float(nnn)` `y=naa(k)/float(nnn)` `dx=x-xb` `p=0.` `if(k.eq.k1)then` `p=(x-x1)/dx` `p1=p` `elseif(k.eq.k2)then` `p=(x2-xb)/dx` `p2=p` `elseif(k.gt.k1.and.k.lt.k2)then` `p=1` `endif` `av=av+ypk` `su=su+yp` `enddo` `av=av/su` `n1=nint(100p1)` `n2=nint(100p2)` `if(n1.eq.0)then` `k1=k1+1` `n1=100` `endif` `if(k1.le.9)fmt1='i1,4x'` `if(k1.gt.9.and.k1.le.99)fmt1='i2,3x'` `if(k1.gt.99.and.k1.le.999)fmt1='i3,2x'` `if(k1.gt.999.and.k1.le.9999)fmt1='i4,1x'` `if(k2.le.9)fmt2='i1,4x'` `if(k2.gt.9.and.k2.le.99)fmt2='i2,3x'` `if(k2.gt.99.and.k2.le.999)fmt2='i3,2x'` `if(k2.gt.999.and.k2.le.9999)fmt2='i4,1x'` `write(6,'(i4,a,i5,a,'//fmt1//',i6,a,i5,a,'//fmt2//',5x,a,f8.2)')` `& nint(xpar2),':MIN',n1,'%',k1` `& ,nint(xpar1),':MAX',n2,'%',k2 ,'av:',av` `endif` `end` `c-----------------------------------------------------------------------` `function conbmx()` `c-----------------------------------------------------------------------` `double precision om1intbc,p,eps` `include 'epos.inc'` `include 'epos.incsem'` `conbmx=0.` `b1=0.` `b2=7.` `eps=5.0d-3` `p=1.d0-dexp(-om1intbc(b2))` `if(p.gt.2.d0eps)return` `ntry=0` `10 ntry=ntry+1` `b=b1+.5(b2-b1)` `p=(1.d0-dexp(-om1intbc(b)))` `if(p.gt.eps)then` `if(p.gt.2.d0eps)then` `b1=b` `else` `conbmx=b` `return` `endif` `else` `if(p.lt.eps/5.d0)then` `b2=b` `else` `conbmx=b` `return` `endif` `endif` `if(ntry.le.1000)goto 10` `write(ifmt,)'Too much try in conbmx ... bmax=',b` `conbmx=b` `return` `end` `c-----------------------------------------------------------------------` `function conbmxndif()` `c-----------------------------------------------------------------------` `double precision om1intbc,p,eps` `include 'epos.inc'` `include 'epos.incsem'` `iomegasave=iomega` `iomega=2` `conbmxndif=0.` `b1=0.` `b2=7.` `conbmxndif=b2` `eps=1d-10` `p=1.d0-dexp(-om1intbc(b2))` `if(p.gt.2.d0eps)goto 100` `ntry=0` `10 ntry=ntry+1` `b=b1+.5(b2-b1)` `p=(1.d0-dexp(-om1intbc(b)))` `if(p.gt.eps)then` `if(p.gt.2.d0eps)then` `b1=b` `else` `conbmxndif=b` `goto 100` `endif` `else` `if(p.lt.eps/5.d0)then` `b2=b` `else` `conbmxndif=b` `goto 100` `endif` `endif` `if(ntry.le.1000)goto 10` `write(ifmt,)'Too much try in conbmxndif ... bkmxndif=',b` `conbmxndif=b` `100 iomega=iomegasave` `return` `end` `c-----------------------------------------------------------------------` `function conbmxdif()` `c-----------------------------------------------------------------------` `c find b to have (1-exp(-om))pmax=pdiff` `c-----------------------------------------------------------------------` `double precision om1intbc,pmax,drootom,pdiff` `include 'epos.inc'` `include 'epos.incsem'` `conbmxdif=0.` `b1=0.` `bmax=7.` `iomegasave=iomega` `iomega=2` `eps=1.e-5` `pmax=1.d0-dexp(-om1intbc(b1))` `pdiff=facdif` `if(pmax.gt.eps)then` `conbmxdif=drootom(pdiff,pmax,bmax,eps)` `endif` `iomega=iomegasave` `return` `end` `c-----------------------------------------------------------------------` `subroutine conre` `c-----------------------------------------------------------------------` `c initializes remnants` `c-----------------------------------------------------------------------` `include "epos.incems"` `include 'epos.inc'` `call utpri('conre ',ish,ishini,6)` `c proj` `c ----` `la=laproj` `ma=iabs(maproj)` `las=0` `mas=0` `do l=1,ma` `if(la.lt.0)then` `if(iabs(idproj).lt.20)then` `id=idproj` `else` `ia=iabs(idproj/10)` `is=idproj/iabs(idproj)` `if(ia.ne.111.and.ia.ne.222.and.ia.ne.333)id=idproj/1010` `if(ia.eq.111.or. ia.eq.222.or. ia.eq.333)id=idproj/1010+is` `if(ia.eq.213)id=1230is` `endif` `else` `id=1220` `if(rangen().le.(la-las)1./(ma-mas))id=1120` `if(id.eq.1120)las=las+1` `mas=mas+1` `endif` `ic1=idtrai(1,id,1)` `ic2=idtrai(2,id,1)` `icproj(1,l)=ic1` `icproj(2,l)=ic2` `enddo` `c targ` `c ----` `la=latarg` `ma=iabs(matarg)` `las=0` `mas=0` `do l=1,ma` `if(la.lt.0)then` `if(iabs(idtarg).lt.20)then` `id=idtarg` `else` `ia=iabs(idtarg/10)` `is=idtarg/iabs(idtarg)` `if(ia.ne.111.and.ia.ne.222.and.ia.ne.333)id=idtarg/1010` `if(ia.eq.111.or. ia.eq.222.or. ia.eq.333)id=idtarg/1010+is` `if(ia.eq.213)id=1230is` `endif` `else` `id=1220` `if(rangen().le.(la-las)1./(ma-mas))id=1120` `if(id.eq.1120)las=las+1` `mas=mas+1` `endif` `ic1=idtrai(1,id,1)` `ic2=idtrai(2,id,1)` `ictarg(1,l)=ic1` `ictarg(2,l)=ic2` `enddo` `call utprix('conre ',ish,ishini,6)` `return` `end` `c-----------------------------------------------------------------------` `subroutine conrl` `c-----------------------------------------------------------------------` `c initializes target remnant in case of appl lepton` `c-----------------------------------------------------------------------` `include "epos.incems"` `common/nucl1/laproj,maproj,latarg,matarg,core,fctrmx` `common/hadr2/iomodl,idproj,idtarg,wexcit` `c targ` `c ----` `la=latarg` `ma=iabs(matarg)` `las=0` `mas=0` `do l=1,ma` `if(la.lt.0)then` `id=idtarg` `else` `id=1220` `if(rangen().le.(la-las)1./(ma-mas))id=1120` `if(id.eq.1120)las=las+1` `mas=mas+1` `endif` `ic1=idtrai(1,id,1)` `ic2=idtrai(2,id,1)` `ictarg(1,l)=ic1` `ictarg(2,l)=ic2` `enddo` `return` `end` `c-----------------------------------------------------------------------` `subroutine conwr` `c-----------------------------------------------------------------------` `c writes /cptl/` `c-----------------------------------------------------------------------` `include "epos.inc"` `include "epos.incems"` `double precision XA(210,3),XB(210,3),BQGS,BMAXQGS,BMAXNEX,BMINNEX` `COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX` `common/nucl3/phi,bimp` `common /cncl/xproj(mamx),yproj(mamx),zproj(mamx)` `,xtarg(mamx),ytarg(mamx),ztarg(mamx)` `parameter(iapmax=208)` `double precision bqgs2,bmaxqgs2,bmaxnex2,bminnex2,xan,xbn` `common /qgsIInex1/xan(iapmax,3),xbn(iapmax,3)` `,bqgs2,bmaxqgs2,bmaxnex2,bminnex2` `common/photrans/phoele(4),ebeam` `integer ic(2)` `call utpri('conwr ',ish,ishini,6)` `bx=cos(phi)bimp` `by=sin(phi)bimp` `c write /cptl/` `c ------------` `nptl=0` `if(iokoll.eq.1)then ! precisely matarg collisions` `nptl=nptl+1` `do 3 i=1,4` `3 xorptl(i,nptl)=0` `tivptl(1,nptl)=-ainfin` `tivptl(2,nptl)=0` `istptl(nptl)=1` `iorptl(nptl)=-1` `jorptl(nptl)=0` `do 1 k=1,koll` `nptl=nptl+1` `do 4 i=1,4` `4 xorptl(i,nptl)=0` `tivptl(1,nptl)=-ainfin` `tivptl(2,nptl)=0` `istptl(nptl)=1` `iorptl(nptl)=-1` `jorptl(nptl)=0` `1 continue` `elseif(iappl.ne.7)then` `c print ,'proj'` `do 6 i=1,maproj` `nptl=nptl+1` `istptl(nptl)=0` `iorptl(nptl)=0` `jorptl(nptl)=0` `if(model.eq.2)then !QGSJet` `xproj(i)=XA(i,1)` `yproj(i)=XA(i,2)` `zproj(i)=XA(i,3)` `istptl(nptl)=1` `iorptl(nptl)=-1` `elseif(model.eq.7.or.model.eq.11)then !QGSJetII` `xproj(i)=xan(i,1)` `yproj(i)=xan(i,2)` `zproj(i)=xan(i,3)` `istptl(nptl)=1` `iorptl(nptl)=-1` `elseif(model.ge.3)then !Gheisha, ...` `istptl(nptl)=1` `iorptl(nptl)=-1` `endif` `xorptl(1,nptl)=xproj(i)+bx/2` `xorptl(2,nptl)=yproj(i)+by/2` `xorptl(3,nptl)=zproj(i)` `xorptl(4,nptl)=0` `tivptl(1,nptl)=-ainfin` `c for visualisation uncomment` `c-c tivptl(1,nptl)=-100` `tivptl(2,nptl)= ainfin` `c print ,i,xorptl(1,nptl),xorptl(2,nptl),xorptl(3,nptl)` `6 continue` `c print ,'targ'` `do 7 i=1,matarg` `nptl=nptl+1` `istptl(nptl)=0` `iorptl(nptl)=0` `jorptl(nptl)=0` `if(model.eq.2)then !QGSJet` `xtarg(i)=XB(i,1)` `ytarg(i)=XB(i,2)` `ztarg(i)=XB(i,3)` `istptl(nptl)=1` `iorptl(nptl)=-1` `elseif(model.eq.7.or.model.eq.11)then !QGSJetII` `xtarg(i)=xbn(i,1)` `ytarg(i)=xbn(i,2)` `ztarg(i)=xbn(i,3)` `istptl(nptl)=1` `iorptl(nptl)=-1` `elseif(model.ge.3)then !Gheisha, ...` `istptl(nptl)=1` `iorptl(nptl)=-1` `endif` `xorptl(1,nptl)=xtarg(i)-bx/2` `xorptl(2,nptl)=ytarg(i)-by/2` `xorptl(3,nptl)=ztarg(i)` `xorptl(4,nptl)=0` `tivptl(1,nptl)=-ainfin` `c for visualisation uncomment` `c-c tivptl(1,nptl)=-100` `tivptl(2,nptl)= ainfin` `c print ,i,xorptl(1,nptl),xorptl(2,nptl),xorptl(3,nptl)` `7 continue` `if(abs(idprojin).eq.12)then !electron for fake DIS` `c electron projectile` `nptl=nptl+1` `istptl(nptl)=41` `iorptl(nptl)=-1` `jorptl(nptl)=-1` `iorptl(1)=nptl !pi0 (porjectile) coming from lepton` `xorptl(1,nptl)=bx/2` `xorptl(2,nptl)=by/2` `xorptl(3,nptl)=0.` `xorptl(4,nptl)=0.` `tivptl(1,nptl)=-ainfin` `tivptl(2,nptl)=0.` `c target nucleons (in lab frame)` `do i=1,matarg` `nptl=nptl+1` `istptl(nptl)=41` `iorptl(nptl)=-1` `jorptl(nptl)=-1` `xorptl(1,nptl)=xtarg(i)-bx/2` `xorptl(2,nptl)=ytarg(i)-by/2` `xorptl(3,nptl)=ztarg(i)` `xorptl(4,nptl)=0` `tivptl(1,nptl)=-ainfin` `c for visualisation uncomment` `c -c tivptl(1,nptl)=-100` `tivptl(2,nptl)= ainfin` `enddo` `c electron remnant` `nptl=nptl+1` `istptl(nptl)=0` `iorptl(nptl)=maproj+matarg+1` `jorptl(nptl)=-1` `xorptl(1,nptl)=bx/2` `xorptl(2,nptl)=by/2` `xorptl(3,nptl)=0.` `xorptl(4,nptl)=0.` `tivptl(1,nptl)=0.` `tivptl(2,nptl)= ainfin` `endif` `endif` `nptl=0` `if(iappl.le.2)then` `do i=1,maproj` `nptl=nptl+1` `ic(1)=icproj(1,i)` `ic(2)=icproj(2,i)` `id=idtra(ic,0,0,0)` `c id=idtra(ic,0,0,3) !tp071107 imix=3 ??????????` `call idmass(id,ams)` `idptl(nptl)=id` `pptl(1,nptl)=0.` `pptl(2,nptl)=0.` `pptl(3,nptl)=pnullx` `pptl(4,nptl)=sqrt(pnullx2+ams2)` `pptl(5,nptl)=ams` `ifrptl(1,nptl)=0` `ifrptl(2,nptl)=0` `ityptl(nptl)=0` `enddo` `endif` `if(iappl.ne.7)then` `do i=1,matarg` `nptl=nptl+1` `ic(1)=ictarg(1,i)` `ic(2)=ictarg(2,i)` `id=idtra(ic,0,0,0)` `c id=idtra(ic,0,0,3) !tp071107 imix=3 ??????????` `call idmass(id,ams)` `idptl(nptl)=id` `pptl(1,nptl)=0.` `pptl(2,nptl)=0.` `pptl(3,nptl)=-pnullx` `pptl(4,nptl)=sqrt(pnullx2+ams2)` `pptl(5,nptl)=ams` `ifrptl(1,nptl)=0` `ifrptl(2,nptl)=0` `ityptl(nptl)=0` `enddo` `if(abs(idprojin).eq.12)then !electron for fake DIS` `c electron projectile` `nptl=nptl+1` `id=idprojin` `call idmass(id,ams)` `idptl(nptl)=id` `pptl(1,nptl)=0.` `pptl(2,nptl)=0.` `pptl(3,nptl)=sqrt(max(0.,(elepti+ams)(elepti-ams)))` `pptl(4,nptl)=elepti` `pptl(5,nptl)=ams` `ifrptl(1,nptl)=1` `ifrptl(2,nptl)=1` `ityptl(nptl)=40` `c target nucleons (in lab frame)` `do i=1,matarg` `nptl=nptl+1` `idptl(nptl)=idptl(maproj+i)` `pptl(1,nptl)=0.` `pptl(2,nptl)=0.` `pptl(3,nptl)=-pnll` `pptl(4,nptl)=ebeam` `pptl(5,nptl)=pptl(5,maproj+i)` `ifrptl(1,nptl)=maproj+i` `ifrptl(2,nptl)=maproj+i` `ityptl(nptl)=50` `enddo` `c electron remnant` `nptl=nptl+1` `idptl(nptl)=id` `pptl(1,nptl)=phoele(1)` `pptl(2,nptl)=phoele(2)` `pptl(3,nptl)=phoele(3)` `pptl(4,nptl)=phoele(4)` `pptl(5,nptl)=ams` `ifrptl(1,nptl)=0` `ifrptl(2,nptl)=0` `ityptl(nptl)=40` `endif` `else` `nptl=nptl+1` `id=idproj` `call idmass(id,ams)` `idptl(nptl)=id` `pptl(1,nptl)=0.` `pptl(2,nptl)=0.` `pptl(3,nptl)=pnullx` `pptl(4,nptl)=sqrt(pnullx2+ams2)` `pptl(5,nptl)=ams` `ifrptl(1,nptl)=0` `ifrptl(2,nptl)=0` `ityptl(nptl)=0` `iorptl(nptl)=-1` `jorptl(nptl)=0` `istptl(nptl)=0` `do 5 i=1,4` `5 xorptl(i,nptl)=0` `tivptl(1,nptl)=0` `tivptl(2,nptl)=0` `endif` `c exit` `c ----` `call utprix('conwr ',ish,ishini,6)` `return` `end` `c------------------------------------------------------------------------` `subroutine conxyz(ch,n,x,y,z,ynuc)` `c-----------------------------------------------------------------------` `include 'epos.inc'` `real x(n),y(n),z(n)` `character ch1` `massnr=0` `iii=0` `if(ch.eq.'p')then` `massnr=maproj` `iii=1` `elseif(ch.eq.'t')then` `massnr=matarg` `iii=2` `else` `call utstop('conxyz: nucleus neither proj nor targ&')` `endif` `if(massnr.eq.0)return` `if(massnr.gt.n)call utstop('conxyz: massnr.gt.n&')` `if(massnr.eq.1)then` `x(1)=0` `y(1)=0` `z(1)=0` `return` `endif` `rad=radnuc(massnr)` `if(massnr.ge.10)then !---wood-saxon density---` `rad=rad/difnuc(massnr)` `cr1=1.+3./rad+6./rad2+6./rad3` `cr2=3./rad` `cr3=3./rad+6./rad*2` `do i=1,massnr` `1 zuk=rangen()cr1-1.` `if(zuk.le.0.)then` `tt=rad(rangen().3333-1.)` `elseif(zuk.le.cr2 )then` `tt=-log(rangen())` `elseif(zuk.lt.cr3 )then` `tt=-log(rangen())-log(rangen())` `else` `tt=-log(rangen())-log(rangen())-log(rangen())` `endif` `if(rangen().gt.1./(1.+exp(-abs(tt))))goto 1` `rim=tt+rad` `zz=rim(2.rangen()-1.)` `rim=sqrt(rimrim-zzzz)` `z(i)=zzdifnuc(massnr)` `call pscs(c,s)` `x(i)=rimcdifnuc(massnr)` `y(i)=rimsdifnuc(massnr)` `enddo` `elseif(massnr.ge.3)then ! ---gaussian density---` `rad=radsqrt(2.massnr/(massnr-1.)) !van hove simulation` `do l=1,3` `summ=0.` `do i=1,massnr-1` `j=massnr-i` `aks=rad (rangen()+rangen()+rangen()-1.5)` `k=j+1` `if(l.eq.1)x(k)=summ-akssqrt(float(j)/k)` `if(l.eq.2)y(k)=summ-akssqrt(float(j)/k)` `if(l.eq.3)z(k)=summ-akssqrt(float(j)/k)` `summ=summ+aks/sqrt(float(jk))` `enddo` `if(l.eq.1)x(1)=summ` `if(l.eq.2)y(1)=summ` `if(l.eq.3)z(1)=summ` `enddo` `elseif(massnr.eq.2)then ! ---deuteron---` `!.........r=tdifnuc(massnr), t~exp(-2t)(1-exp(-at))` `a=radnuc(massnr)` `2 t=-0.5alog(rangen()) !~exp(-2t)` `if(rangen().gt.(1-exp(-at))*2)goto2` `r=tdifnuc(massnr)` `zz=r(2.rangen()-1.)` `call pscs(c,s)` `rxy=sqrt(rr-zzzz)` `z(1)=0.5zz` `x(1)=0.5rxyc` `y(1)=0.5rxys` `z(2)=-z(1)` `x(2)=-x(1)` `y(2)=-y(1)` `else` `stop'conxyz: wrong massnr. '` `endif` `c...plot preparation` `rmax=(radnuc(massnr)+3)` `drnucl(iii)=rmax/mxnucl` `nrnucl(iii)=nrnucl(iii)+1` `do i=1,massnr` `r=sqrt(x(i)2+y(i)2+z(i)2)` `k=1+int(r/drnucl(iii))` `if(k.le.mxnucl)rnucl(k,iii)=rnucl(k,iii)+1` `enddo` `c...lorentz trafo` `do i=1,massnr` `z(i)=z(i)/cosh(ynuc)` `enddo` `return` `end` `c-----------------------------------------------------------------------` `subroutine conini` `c-----------------------------------------------------------------------` `include 'epos.inc'` `imax=max(maproj,matarg)` `if(idtargin.eq.0)imax=max(imax,40)` `do massnr=1,mamxx` `dif=0.54` `rad=0.` `if(massnr.gt.imax.or.massnr.eq.1)then` `dif=0` `rad=0` `elseif(massnr.eq.197)then` `dif=0.562` `rad=6.5` `elseif(massnr.ge.10)then` `rad=1.12massnr*0.33333-0.86massnr*(-0.33333)` `elseif(massnr.ge.3)then` `rad=.9float(massnr)*.3333` `elseif(massnr.eq.2)then` `dif=4.316` `rad=4.68` `endif` `difnuc(massnr)=dif` `radnuc(massnr)=rad` `enddo` `end` `c-----------------------------------------------------------------------` `subroutine xConNuclDens(iii)` `c-----------------------------------------------------------------------` `c plots distribution of nucleons in nuclei` `c iii = 1 (proj) or 2 (targ)` `c-----------------------------------------------------------------------` `include 'epos.inc'` `if(model.ne.1)return` `massnr=1` `if(iii.eq.1)then` `massnr=maproj` `elseif(iii.eq.2)then` `massnr=matarg` `endif` `if(massnr.eq.1)return` `a=1./4.316` `b=4.68` `write(ifhi,'(a)') '!-----------------------------------------'` `write(ifhi,'(a)') '! nuclear density '` `write(ifhi,'(a)') '!-----------------------------------------'` `write(ifhi,'(a)') 'openhisto'` `if(massnr.ge.10)write(ifhi,'(a)')'htyp lin xmod lin ymod lin'` `if(massnr.lt.10)write(ifhi,'(a)')'htyp lin xmod lin ymod log'` `write(ifhi,'(a)') 'text 0 0 "title nuclear density"'` `write(ifhi,'(a)') 'text 0.99 -0.15 " r (fm) "'` `write(ifhi,'(a)') 'text 0 0 "yaxis rho(r)"'` `write(ifhi,'(a,2e11.3)')'xrange',0.,mxnucldrnucl(iii)` `write(ifhi,'(3a)')'yrange',' 0 ',' auto'` `write(ifhi,'(a)') 'array 2'` `do j=1,mxnucl` `r=(j-0.5)drnucl(iii)` `d=0.5drnucl(iii)` `write(ifhi,'(2e12.4)') r,rnucl(j,iii)/nrnucl(iii)/` `* (4./3.pi((r+d)3-(r-d)3))` `enddo` `write(ifhi,'(a)') ' endarray'` `write(ifhi,'(a)') 'closehisto plot 0-'` `write(ifhi,'(a)') 'openhisto'` `write(ifhi,'(a)') 'htyp lbo '` `write(ifhi,'(a)') 'array 2'` `do j=1,mxnucl` `r=(j-0.5)drnucl(iii)` `rr=2r` `rho=1` `if(massnr.eq.2)then` `rho=1.00((1-exp(-barr))exp(-arr)/rr)2` `elseif(massnr.eq.197)then` `rho=0.16/(1+exp((r-6.5)/0.562))` `elseif(massnr.ge.10)then` `rho=0.16/(1+exp((r-radnuc(massnr))/difnuc(massnr)))` `endif` `write(ifhi,'(2e12.4)') r,rho` `enddo` `write(ifhi,'(a)') ' endarray'` `write(ifhi,'(a)') 'closehisto plot 0'` `end` `c-----------------------------------------------------------------------` `subroutine xConThick(iii)` `c-----------------------------------------------------------------------` `! plots sigma_pp T_A (b) (=average number of collisions)` `! T_A = thickness function` `! iii = 1 (proj) or 2 (targ)` `!----------------------------------------------------------------` `include 'epos.inc'` `parameter(iconimax=20,iconkmax=100)` `real thick(2,0:iconimax)` `imax=iconimax` `kmax=iconkmax` `if(model.ne.1)return` `ramx=mxnucldrnucl(iii)` `do i=0,imax` `x=i/float(imax)ramx` `sum=0` `rho0=conrho(iii,0.)` `h=ramx/kmax` `do k=1,kmax` `z=kh` `r=sqrt(xx+zz)` `rho2=conrho(iii,r)` `z=(k-0.5)h` `r=sqrt(xx+zz)` `rho1=conrho(iii,r)` `sum=sum+h/6.(rho0+4rho1+rho2)` `rho0=rho2` `enddo` `sum=sum2 ! integral fro -infty to +infty` `thick(1,i)=x` `thick(2,i)=sum` `enddo` `write(ifhi,'(a)') 'openhisto'` `write(ifhi,'(a)') 'htyp lbo '` `write(ifhi,'(a)') 'txt "xaxis b (fm)" '` `write(ifhi,'(a)') 'txt "yaxis [s]?pp! T?A! (b) " '` `write(ifhi,'(a)') 'array 2'` `do i=0,imax` `write(ifhi,'(2e12.4)') thick(1,i),sigine/10.thick(2,i)` `enddo` `write(ifhi,'(a)') ' endarray'` `write(ifhi,'(a)') 'closehisto plot 0'` `end` `c-----------------------------------------------------------------------` `function conrho(iii,r)` `c-----------------------------------------------------------------------` `! nuclear density` `! iii = 1 (proj) or 2 (targ)` `!----------------------------------------------------------------` `include 'epos.inc'` `conrho=1.` `if(model.ne.1)return` `massnr=1` `if(iii.eq.1)then` `massnr=maproj` `elseif(iii.eq.2)then` `massnr=matarg` `endif` `if(massnr.eq.1)return` `a=1./4.316` `b=4.68` `rr=2r` `rho=1` `if(massnr.eq.2.and.rr.gt.0.)then` `rho=1.00((1-exp(-barr))exp(-arr)/rr)**2` `elseif(massnr.eq.197)then` `rho=0.16/(1+exp((r-6.5)/0.562))` `elseif(massnr.ge.10)then` `rho=0.16/(1+exp((r-radnuc(massnr))/difnuc(massnr)))` `endif` `conrho=rho` `end`

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c-----------------------------------------------------------------------
      subroutine conaa(iret)
c-----------------------------------------------------------------------
c  determines interaction configuration
c-----------------------------------------------------------------------

      include 'epos.inc'
      include 'epos.incems'
      include 'epos.incsem'
      include 'epos.incpar'

      common/geom/rmproj,rmtarg,bmax,bkmx
      common/nucl3/phi,bimp
      common /cncl/xproj(mamx),yproj(mamx),zproj(mamx)
     *            ,xtarg(mamx),ytarg(mamx),ztarg(mamx)
      common/cfacmss/facmss
      double precision yyrmax
      common/scrangle/ phik3(kollmx),thetak3(kollmx)

      call utpri('conaa ',ish,ishini,4)

      iret=0

c     initialisations
c     ---------------

      vel=tanh(ypjtl-yhaha)+tanh(yhaha)

c     determine phi, bimp, coll, iproj, itarg, x/y/zproj, x/y/ztarg
c     ---------------------------------------------------------------

           if(iokoll.eq.1)then

      koll=matarg
      do k=1,koll
        do n=1,4
          coord(n,k)=0.
        enddo
      enddo
      bimp=0
      phi=0
      xproj(1)=0
      yproj(1)=0
      zproj(1)=0
      lproj(1)=koll
      lproj3(1)=0
      do k=1,koll
        bij=bkmx*sqrt(rangen())
        bk(k)=bij
        iproj(k)=1
        itarg(k)=k
        phi=2.*pi*rangen()
        xtarg(k)=bij*cos(phi)
        ytarg(k)=bij*sin(phi)
        ztarg(k)=0
        ltarg(k)=1
        kproj(1,k)=k
        ktarg(k,1)=k
        ltarg3(k)=0
        ktarg3(k,1)=0
        kproj3(k,1)=0
        if(iscreen.ne.0.and.bij.le.bkmxndif)then
          if(zbrmax.le.0..or. bij.lt.zbcutx+zbrmax*rangen())then
            lproj3(1)=lproj3(1)+1
            ltarg3(k)=1
            kproj3(1,lproj3(1))=k
            ktarg3(k,1)=k
          endif
        endif
      enddo

           elseif(maproj.eq.1.and.matarg.eq.1)then

      b1=bminim
      b2=amin1(bkmx,bmaxim)
      if(b1.gt.b2)call utstop('conaa: bmin > bmax&')
      bimp=sqrt(b1*b1+(b2*b2-b1*b1)*rangen())
      koll=1
      do n=1,4
        coord(n,1)=0.
      enddo
      bk(1)=bimp
      iproj(1)=1
      itarg(1)=1
      phi=2.*pi*rangen()
      xproj(1)=bimp*cos(phi)
      yproj(1)=bimp*sin(phi)
      zproj(1)=0
      xtarg(1)=0
      ytarg(1)=0
      ztarg(1)=0
      lproj(1)=1
      ltarg(1)=1
      lproj3(1)=1
      ltarg3(1)=1
      kproj3(1,1)=1
      ktarg3(1,1)=1
      kproj(1,1)=1
      ktarg(1,1)=1

           else

      call conxyz('p',mamx,xproj,yproj,zproj,ypjtl-yhaha)
      call conxyz('t',mamx,xtarg,ytarg,ztarg,yhaha)

      bx=0
      by=0
      if(maproj.gt.0)then
      if(bimevt.lt.0)then
        b1=bminim
        b2=amin1(rmproj+rmtarg,bmaxim)
        if(b1.gt.b2)call utstop('conaa: bmin > bmax&')
        bimp=sqrt(b1**2+(b2**2-b1**2)*rangen())
        if(nbarray.gt.0)bimp=barray(mod(nrevt,nbarray)+1)
        if(jpsi.gt.0)then
          bimp=b1+(b2-b1)*(float(mod(nrevt,12))+rangen())/12.
          bimevt=bimp
        endif
        phi=phimin+rangen()*(phimax-phimin)
      else
        phi=phievt
        bimp=bimevt
      endif
      bx=cos(phi)*bimp
      by=sin(phi)*bimp
      endif
      if(jpsi.lt.0)then !modify b
        bx=xtarg(1)
        by=ytarg(1)
      endif
      if(maproj.eq.0)goto1000
      koll=0
      do i=1,maproj
      lproj(i)=0
      lproj3(i)=0
      enddo
      do j=1,matarg
      ltarg(j)=0
      ltarg3(j)=0
      enddo
      do 12 i=1,maproj
      do 11 j=1,matarg
      if(jpsi.lt.0.and.ztarg(j).le.ztarg(1))goto11
      bij=sqrt((xproj(i)+bx-xtarg(j))**2+(yproj(i)+by-ytarg(j))**2)
      if(ish.ge.7)write(ifch,*)'i_p:',i,' i_t:',j,' b_ij:',bij
      if(bij.gt.bkmx)goto 11

      koll=koll+1
      if(koll.gt.kollmx)call utstop('conaa: kollmx too small&')
      bk(koll)=bij
      bkx(koll)=xproj(i)+bx-xtarg(j)
      bky(koll)=yproj(i)+by-ytarg(j)
      iproj(koll)=i
      itarg(koll)=j
      lproj(i)=lproj(i)+1
      ltarg(j)=ltarg(j)+1
      kproj(i,lproj(i))=koll
      ktarg(j,ltarg(j))=koll
      phik3(koll)=0.
      thetak3(koll)=0.
      if(iscreen.ne.0.and.bij.le.bkmxndif)then
        if(zbrmax.gt.0..and.bij.gt.zbcutx+zbrmax*rangen())goto 11
        lproj3(i)=lproj3(i)+1
        ltarg3(j)=ltarg3(j)+1
        kproj3(i,lproj3(i))=koll
        ktarg3(j,ltarg3(j))=koll
c define angle for anti-shadowing
        if(abs(bky(koll)).gt.1.e-6)then
          if(abs(bkx(koll)).gt.1.e-6)then
            phik3(koll)=atan(bky(koll)/bkx(koll))
          else
            phik3(koll)=sign(0.5*pi,bky(koll))
          endif
        elseif(bkx(koll).lt.0.)then
          phik3(koll)=pi
        endif
        if(bk(koll).gt.0.)then
          thetak3(koll)=atan(bglaubx/bk(koll))
        else
          thetak3(koll)=0.5*pi
        endif
      endif

11    continue
12    continue

      do k=1,koll
        do n=1,4
          coord(n,k)=0.
        enddo
      enddo


          endif

      if(ish.ge.3)write(ifch,*)'koll=',koll
      if(koll.eq.0)goto 1001


c     determine coord
c     ---------------
      do kl=1,koll
      i=iproj(kl)
      j=itarg(kl)
      dist=ztarg(j)-zproj(i)
      coord(1,kl)=(xproj(i)+xtarg(j))*0.5
      coord(2,kl)=(yproj(i)+ytarg(j))*0.5
      coord(3,kl)=(zproj(i)+ztarg(j))*0.5
      coord(4,kl)=dist/vel
      enddo

      if(iscreen.ne.0)call CalcScrPair(bimp)

    !~~~~~redefine energy in case of imposed radial flow~~~~~~~~~~~~~~~~
      yrmaxi=max(0.,yradmx+yradmi*log(1.+engy/sqrt(float(koll))))
      if(yrmaxi.gt.1e-5)then
        yyrmax=dble(yrmaxi)
        fradflii=sngl(1d0/
     &  ((sinh(yyrmax)*yyrmax-cosh(yyrmax)+1d0)/(yyrmax**2/2d0)))
      else
        fradflii=1.
      endif
      if(ish.ge.3)write(ifch,*)'yrmaxi=',yrmaxi


c     exit
c     ----
1000  continue
      if(ish.ge.5)then
      write(ifch,*)'ia,x/y/zproj:'
      do mm=1,maproj
      write(ifch,*)mm,xproj(mm),yproj(mm),zproj(mm)
      enddo
      write(ifch,*)'ia,x/y/ztarg:'
      do mm=1,matarg
      write(ifch,*)mm,xtarg(mm),ytarg(mm),ztarg(mm)
      enddo
      write(ifch,*)'iret',iret
      endif
      call utprix('conaa ',ish,ishini,4)
      return

1001  continue !iret=1 causes redo of whole collision
      iret=1
      if(ish.ge.3)then
      write(ifch,*)
      write(ifch,*)'***** subroutine conaa:'
      write(ifch,*)'***** no nucleon pair found --> no interaction'
      write(ifch,*)
      endif
      goto 1000

      end

c-----------------------------------------------------------------------
      function frdmzcut(b)
c-----------------------------------------------------------------------
c  determines interaction configuration
c-----------------------------------------------------------------------

      include 'epos.inc'
      include 'epos.incpar'

      frdmzcut=zbcutx*exp(-(b*rangen()))
c      frdmzcut=zbcutx*rangen()
c      bdum=b
      return
      end

c-----------------------------------------------------------------------
      subroutine CalcScrPair(b)
c-----------------------------------------------------------------------
c  determines interaction configuration
c-----------------------------------------------------------------------

      include 'epos.inc'
      include 'epos.incems'
      include 'epos.incpar'

      common/scrangle/ phik3(kollmx),thetak3(kollmx)
      logical lascr(kollmx),cont


c     order pairs for splitting as a function of b
c     ---------------
      do i=1,maproj
        if(lproj3(i).gt.1)then
          do l=2,lproj3(i)
            m=l
 100        continue
              kp=kproj3(i,m-1)
              kl=kproj3(i,m)
              if(bk(kl).lt.bk(kp))then
                kproj3(i,m-1)=kl
                kproj3(i,m)=kp
                m=m-1
            if(m.gt.1)goto 100
              endif
          enddo
        endif
      enddo
      do j=1,matarg
        if(ltarg3(j).gt.1)then
          do l=2,ltarg3(j)
            m=l
 200        continue
              kp=ktarg3(j,m-1)
              kl=ktarg3(j,m)
              if(bk(kl).lt.bk(kp))then
                ktarg3(j,m-1)=kl
                ktarg3(j,m)=kp
                m=m-1
            if(m.gt.1)goto 200
              endif
          enddo
        endif
      enddo

      if(koll.gt.1)then
c Define anti-shadowing as a consequence of geometrical screening of
c nucleons at large b by the one at small b

c Projectile
c Check phi not to be in the range of a nucleon with smaller b
        do i=1,maproj
          if(lproj3(i).gt.1)then
            kl=kproj3(i,1)
            lascr(kl)=.true.
            do 300 l=lproj3(i),2,-1
              kl=kproj3(i,l)
              lascr(kl)=.true.
              if(bk(kl).ge.frdmzcut(b))then
                do m=1,l-1
                  km=kproj3(i,m)
                  if(kl.ne.km.and.bk(km).ge.frdmzcut(b)
     &          .and.phik3(kl).ge.phik3(km)-thetak3(km)
     &          .and.phik3(kl).le.phik3(km)+thetak3(km))then
                    lascr(kl)=.false.
                    goto 300
                  endif
                enddo
              endif
 300        continue
          endif
        enddo
c suppress screened pair from the list
        do i=1,maproj
          if(lproj3(i).gt.1)then
            do l=1,lproj3(i)
              kl=kproj3(i,l)
            enddo
          endif
        enddo
        do i=1,maproj
          if(lproj3(i).gt.1)then
            n=2
            cont=lproj3(i).gt.1
            do while(cont)
              l=lproj3(i)
              kl=kproj3(i,l)
c suppress end of the list in order to have the last pair active
              do while(.not.lascr(kl).and.l.gt.1)
                kproj3(i,l)=0
                lproj3(i)=lproj3(i)-1
                l=lproj3(i)
                kl=kproj3(i,l)
              enddo
              cont=lproj3(i).gt.n
              if(cont)then
c compress list
                kn=kproj3(i,n)
                if(.not.lascr(kn))then
                  m=lproj3(i)   !last pair always active
                  km=kproj3(i,m)
                  kproj3(i,n)=km
                  kproj3(i,m)=0
                  lproj3(i)=lproj3(i)-1
                endif
              endif
              n=min(lproj3(i)-1,n)+1
              cont=lproj3(i).ne.n
            enddo
          endif
        enddo

c Target
c Check phi not to be in the range of a nucleon with smaller b
        do j=1,matarg
          if(ltarg3(j).gt.1)then
            kl=ktarg3(j,1)
            lascr(kl)=.true.
            do 400 l=ltarg3(j),2,-1
              kl=ktarg3(j,l)
              lascr(kl)=.true.
              if(bk(kl).ge.frdmzcut(b))then
                do m=1,l-1
                  km=ktarg3(j,m)
                  if(km.ne.kl.and.bk(km).ge.frdmzcut(b)
     &          .and.phik3(kl).ge.phik3(km)-thetak3(km)
     &          .and.phik3(kl).le.phik3(km)+thetak3(km))then
                    lascr(kl)=.false.
                    goto 400
                  endif
                enddo
              endif
 400        continue
          endif
        enddo
c suppress screened pair from the list
        do j=1,matarg
          if(ltarg3(j).gt.1)then
            n=2
            cont=ltarg3(j).gt.1
            do while(cont)
              l=ltarg3(j)
              kl=ktarg3(j,l)
c suppress end of the list in order to have the last pair active
              do while(.not.lascr(kl).and.l.gt.1)
                ktarg3(j,l)=0
                ltarg3(j)=ltarg3(j)-1
                l=ltarg3(j)
                kl=ktarg3(j,l)
              enddo
              cont=ltarg3(j).gt.n
              if(cont)then
c compress list
                kn=ktarg3(j,n)
                if(.not.lascr(kn))then
                  m=ltarg3(j)   !last pair always active
                  km=ktarg3(j,m)
                  ktarg3(j,n)=km
                  ktarg3(j,m)=0
                  ltarg3(j)=ltarg3(j)-1
                endif
              endif
              n=min(ltarg3(j)-1,n)+1
              cont=ltarg3(j).ne.n
            enddo
          endif
        enddo
      endif


      end

c-----------------------------------------------------------------------
      subroutine xGeometry(iii)
c-----------------------------------------------------------------------
      include 'epos.inc'
      include 'epos.incems'
      include 'epos.incsem'
      common/xgeom/nnn,naa(kollmx),nbb(kollmx)
      character*5 fmt1,fmt2

      if(iii.eq.0)then

      do k=1,kollmx
        naa(k)=0
      enddo
      nnn=0


      elseif(iii.eq.1)then

      ngl=0
      do k=1,koll
        r=bk(k)
        if(r.le.sqrt(sigine/10./pi))ngl=ngl+1
      enddo
      if(ngl.ne.0)then
        nnn=nnn+1
        naa(ngl)=naa(ngl)+1
      endif

      elseif(iii.eq.2)then

      if(xpar1.eq.0..and.xpar2.eq.0.)then
       print*,'---------- xGeometry -----------------------'
       return
      endif
      x1=1-0.01*xpar2
      x2=1-0.01*xpar1
      kmx=0
      nbb(1)=naa(1)
      do k=2,kollmx
        if(naa(k).ne.0.)kmx=k
        nbb(k)=nbb(k-1)+naa(k)
      enddo
      k1=0
      k2=0
      do k=1,kmx
        x=nbb(k)/float(nnn)
        if(x.lt.x1)k1=k
        if(x.lt.x2)k2=k
      enddo
      k1=k1+1
      k2=k2+1
      x=0
      av=0
      su=0
      p1=0.
      p2=0.
      do k=1,kmx
        xb=x
        x=nbb(k)/float(nnn)
        y=naa(k)/float(nnn)
        dx=x-xb
        p=0.
        if(k.eq.k1)then
          p=(x-x1)/dx
          p1=p
        elseif(k.eq.k2)then
          p=(x2-xb)/dx
          p2=p
        elseif(k.gt.k1.and.k.lt.k2)then
          p=1
        endif
      av=av+y*p*k
      su=su+y*p
      enddo
      av=av/su
      n1=nint(100*p1)
      n2=nint(100*p2)
      if(n1.eq.0)then
        k1=k1+1
        n1=100
      endif
      if(k1.le.9)fmt1='i1,4x'
      if(k1.gt.9.and.k1.le.99)fmt1='i2,3x'
      if(k1.gt.99.and.k1.le.999)fmt1='i3,2x'
      if(k1.gt.999.and.k1.le.9999)fmt1='i4,1x'
      if(k2.le.9)fmt2='i1,4x'
      if(k2.gt.9.and.k2.le.99)fmt2='i2,3x'
      if(k2.gt.99.and.k2.le.999)fmt2='i3,2x'
      if(k2.gt.999.and.k2.le.9999)fmt2='i4,1x'
      write(6,'(i4,a,i5,a,'//fmt1//',i6,a,i5,a,'//fmt2//',5x,a,f8.2)')
     &       nint(xpar2),':MIN',n1,'%',k1
     &      ,nint(xpar1),':MAX',n2,'%',k2   ,'av:',av
      endif

      end

c-----------------------------------------------------------------------
      function conbmx()
c-----------------------------------------------------------------------
      double precision om1intbc,p,eps
      include 'epos.inc'
      include 'epos.incsem'

      conbmx=0.
      b1=0.
      b2=7.
      eps=5.0d-3
      p=1.d0-dexp(-om1intbc(b2))
      if(p.gt.2.d0*eps)return

      ntry=0

10    ntry=ntry+1
      b=b1+.5*(b2-b1)

      p=(1.d0-dexp(-om1intbc(b)))

      if(p.gt.eps)then
       if(p.gt.2.d0*eps)then
        b1=b
       else
        conbmx=b
       return
       endif
      else
       if(p.lt.eps/5.d0)then
        b2=b
       else
        conbmx=b
        return
       endif
      endif

      if(ntry.le.1000)goto 10
      write(ifmt,*)'Too much try in conbmx ... bmax=',b
      conbmx=b
      return

      end

c-----------------------------------------------------------------------
      function conbmxndif()
c-----------------------------------------------------------------------
      double precision om1intbc,p,eps
      include 'epos.inc'
      include 'epos.incsem'


      iomegasave=iomega
      iomega=2
      conbmxndif=0.
      b1=0.
      b2=7.
      conbmxndif=b2
      eps=1d-10
      p=1.d0-dexp(-om1intbc(b2))
      if(p.gt.2.d0*eps)goto 100

      ntry=0

10    ntry=ntry+1
      b=b1+.5*(b2-b1)

      p=(1.d0-dexp(-om1intbc(b)))

      if(p.gt.eps)then
       if(p.gt.2.d0*eps)then
        b1=b
       else
        conbmxndif=b
       goto 100
       endif
      else
       if(p.lt.eps/5.d0)then
        b2=b
       else
        conbmxndif=b
        goto 100
       endif
      endif

      if(ntry.le.1000)goto 10
      write(ifmt,*)'Too much try in conbmxndif ... bkmxndif=',b
      conbmxndif=b
 100  iomega=iomegasave
      return

      end

c-----------------------------------------------------------------------
      function conbmxdif()
c-----------------------------------------------------------------------
c find b to have (1-exp(-om))pmax=pdiff
c-----------------------------------------------------------------------
      double precision om1intbc,pmax,drootom,pdiff
      include 'epos.inc'
      include 'epos.incsem'

      conbmxdif=0.
      b1=0.
      bmax=7.
      iomegasave=iomega
      iomega=2

      eps=1.e-5
      pmax=1.d0-dexp(-om1intbc(b1))
      pdiff=facdif
      if(pmax.gt.eps)then
        conbmxdif=drootom(pdiff,pmax,bmax,eps)
      endif
      iomega=iomegasave

      return

      end

c-----------------------------------------------------------------------
      subroutine conre
c-----------------------------------------------------------------------
c  initializes remnants
c-----------------------------------------------------------------------
      include "epos.incems"
      include 'epos.inc'

      call utpri('conre ',ish,ishini,6)

c     proj
c     ----
      la=laproj
      ma=iabs(maproj)
      las=0
      mas=0
      do l=1,ma
      if(la.lt.0)then
        if(iabs(idproj).lt.20)then
          id=idproj
        else
          ia=iabs(idproj/10)
          is=idproj/iabs(idproj)
          if(ia.ne.111.and.ia.ne.222.and.ia.ne.333)id=idproj/10*10
          if(ia.eq.111.or. ia.eq.222.or. ia.eq.333)id=idproj/10*10+is
          if(ia.eq.213)id=1230*is
        endif
      else
        id=1220
        if(rangen().le.(la-las)*1./(ma-mas))id=1120
        if(id.eq.1120)las=las+1
        mas=mas+1
      endif
      ic1=idtrai(1,id,1)
      ic2=idtrai(2,id,1)
      icproj(1,l)=ic1
      icproj(2,l)=ic2
      enddo

c     targ
c     ----
      la=latarg
      ma=iabs(matarg)
      las=0
      mas=0
      do l=1,ma
      if(la.lt.0)then
        if(iabs(idtarg).lt.20)then
          id=idtarg
        else
          ia=iabs(idtarg/10)
          is=idtarg/iabs(idtarg)
          if(ia.ne.111.and.ia.ne.222.and.ia.ne.333)id=idtarg/10*10
          if(ia.eq.111.or. ia.eq.222.or. ia.eq.333)id=idtarg/10*10+is
          if(ia.eq.213)id=1230*is
        endif
      else
        id=1220
        if(rangen().le.(la-las)*1./(ma-mas))id=1120
        if(id.eq.1120)las=las+1
        mas=mas+1
      endif
      ic1=idtrai(1,id,1)
      ic2=idtrai(2,id,1)
      ictarg(1,l)=ic1
      ictarg(2,l)=ic2
      enddo

      call utprix('conre ',ish,ishini,6)
      return
      end

c-----------------------------------------------------------------------
      subroutine conrl
c-----------------------------------------------------------------------
c  initializes target remnant in case of appl lepton
c-----------------------------------------------------------------------
      include "epos.incems"
      common/nucl1/laproj,maproj,latarg,matarg,core,fctrmx
      common/hadr2/iomodl,idproj,idtarg,wexcit

c     targ
c     ----
      la=latarg
      ma=iabs(matarg)
      las=0
      mas=0
      do l=1,ma
      if(la.lt.0)then
      id=idtarg
      else
      id=1220
      if(rangen().le.(la-las)*1./(ma-mas))id=1120
      if(id.eq.1120)las=las+1
      mas=mas+1
      endif
      ic1=idtrai(1,id,1)
      ic2=idtrai(2,id,1)
      ictarg(1,l)=ic1
      ictarg(2,l)=ic2
      enddo

      return
      end

c-----------------------------------------------------------------------
      subroutine conwr
c-----------------------------------------------------------------------
c     writes /cptl/
c-----------------------------------------------------------------------
      include "epos.inc"
      include "epos.incems"
      double precision XA(210,3),XB(210,3),BQGS,BMAXQGS,BMAXNEX,BMINNEX
      COMMON /Q_QGSNEX1/ XA,XB,BQGS,BMAXQGS,BMAXNEX,BMINNEX
      common/nucl3/phi,bimp
      common /cncl/xproj(mamx),yproj(mamx),zproj(mamx)
     *,xtarg(mamx),ytarg(mamx),ztarg(mamx)
      parameter(iapmax=208)
      double precision bqgs2,bmaxqgs2,bmaxnex2,bminnex2,xan,xbn
      common /qgsIInex1/xan(iapmax,3),xbn(iapmax,3)
     *,bqgs2,bmaxqgs2,bmaxnex2,bminnex2
      common/photrans/phoele(4),ebeam
      integer ic(2)

      call utpri('conwr ',ish,ishini,6)

      bx=cos(phi)*bimp
      by=sin(phi)*bimp

c     write /cptl/
c     ------------
      nptl=0

           if(iokoll.eq.1)then   ! precisely matarg collisions

      nptl=nptl+1
      do 3 i=1,4
3     xorptl(i,nptl)=0
      tivptl(1,nptl)=-ainfin
      tivptl(2,nptl)=0
      istptl(nptl)=1
      iorptl(nptl)=-1
      jorptl(nptl)=0
      do 1 k=1,koll
      nptl=nptl+1
      do 4 i=1,4
4     xorptl(i,nptl)=0
      tivptl(1,nptl)=-ainfin
      tivptl(2,nptl)=0
      istptl(nptl)=1
      iorptl(nptl)=-1
      jorptl(nptl)=0
1     continue

           elseif(iappl.ne.7)then

c             print *,'proj'

      do 6 i=1,maproj
      nptl=nptl+1
      istptl(nptl)=0
      iorptl(nptl)=0
      jorptl(nptl)=0
      if(model.eq.2)then       !QGSJet
      xproj(i)=XA(i,1)
      yproj(i)=XA(i,2)
      zproj(i)=XA(i,3)
      istptl(nptl)=1
      iorptl(nptl)=-1
      elseif(model.eq.7.or.model.eq.11)then       !QGSJetII
      xproj(i)=xan(i,1)
      yproj(i)=xan(i,2)
      zproj(i)=xan(i,3)
      istptl(nptl)=1
      iorptl(nptl)=-1
      elseif(model.ge.3)then       !Gheisha, ...
      istptl(nptl)=1
      iorptl(nptl)=-1
      endif
      xorptl(1,nptl)=xproj(i)+bx/2
      xorptl(2,nptl)=yproj(i)+by/2
      xorptl(3,nptl)=zproj(i)
      xorptl(4,nptl)=0
      tivptl(1,nptl)=-ainfin
c for visualisation uncomment
c-c   tivptl(1,nptl)=-100
      tivptl(2,nptl)= ainfin
c             print *,i,xorptl(1,nptl),xorptl(2,nptl),xorptl(3,nptl)
6     continue
c             print *,'targ'
      do 7 i=1,matarg
      nptl=nptl+1
      istptl(nptl)=0
      iorptl(nptl)=0
      jorptl(nptl)=0
      if(model.eq.2)then       !QGSJet
      xtarg(i)=XB(i,1)
      ytarg(i)=XB(i,2)
      ztarg(i)=XB(i,3)
      istptl(nptl)=1
      iorptl(nptl)=-1
      elseif(model.eq.7.or.model.eq.11)then       !QGSJetII
      xtarg(i)=xbn(i,1)
      ytarg(i)=xbn(i,2)
      ztarg(i)=xbn(i,3)
      istptl(nptl)=1
      iorptl(nptl)=-1
      elseif(model.ge.3)then       !Gheisha, ...
      istptl(nptl)=1
      iorptl(nptl)=-1
      endif
      xorptl(1,nptl)=xtarg(i)-bx/2
      xorptl(2,nptl)=ytarg(i)-by/2
      xorptl(3,nptl)=ztarg(i)
      xorptl(4,nptl)=0
      tivptl(1,nptl)=-ainfin
c for visualisation uncomment
c-c   tivptl(1,nptl)=-100
      tivptl(2,nptl)= ainfin
c             print *,i,xorptl(1,nptl),xorptl(2,nptl),xorptl(3,nptl)
7     continue
      if(abs(idprojin).eq.12)then   !electron for fake DIS
c electron projectile
        nptl=nptl+1
        istptl(nptl)=41
        iorptl(nptl)=-1
        jorptl(nptl)=-1
        iorptl(1)=nptl         !pi0 (porjectile) coming from lepton
        xorptl(1,nptl)=bx/2
        xorptl(2,nptl)=by/2
        xorptl(3,nptl)=0.
        xorptl(4,nptl)=0.
        tivptl(1,nptl)=-ainfin
        tivptl(2,nptl)=0.
c target nucleons (in lab frame)
        do i=1,matarg
          nptl=nptl+1
          istptl(nptl)=41
          iorptl(nptl)=-1
          jorptl(nptl)=-1
          xorptl(1,nptl)=xtarg(i)-bx/2
          xorptl(2,nptl)=ytarg(i)-by/2
          xorptl(3,nptl)=ztarg(i)
          xorptl(4,nptl)=0
          tivptl(1,nptl)=-ainfin
c         for visualisation uncomment
c         -c   tivptl(1,nptl)=-100
          tivptl(2,nptl)= ainfin
        enddo
c electron remnant
        nptl=nptl+1
        istptl(nptl)=0
        iorptl(nptl)=maproj+matarg+1
        jorptl(nptl)=-1
        xorptl(1,nptl)=bx/2
        xorptl(2,nptl)=by/2
        xorptl(3,nptl)=0.
        xorptl(4,nptl)=0.
        tivptl(1,nptl)=0.
        tivptl(2,nptl)= ainfin
      endif

          endif

      nptl=0
      if(iappl.le.2)then
      do i=1,maproj
      nptl=nptl+1
      ic(1)=icproj(1,i)
      ic(2)=icproj(2,i)
      id=idtra(ic,0,0,0)
c      id=idtra(ic,0,0,3)      !tp071107 imix=3 ??????????
      call idmass(id,ams)
      idptl(nptl)=id
      pptl(1,nptl)=0.
      pptl(2,nptl)=0.
      pptl(3,nptl)=pnullx
      pptl(4,nptl)=sqrt(pnullx**2+ams**2)
      pptl(5,nptl)=ams
      ifrptl(1,nptl)=0
      ifrptl(2,nptl)=0
      ityptl(nptl)=0
      enddo
      endif
      if(iappl.ne.7)then
      do i=1,matarg
      nptl=nptl+1
      ic(1)=ictarg(1,i)
      ic(2)=ictarg(2,i)
      id=idtra(ic,0,0,0)
c      id=idtra(ic,0,0,3)      !tp071107 imix=3 ??????????
      call idmass(id,ams)
      idptl(nptl)=id
      pptl(1,nptl)=0.
      pptl(2,nptl)=0.
      pptl(3,nptl)=-pnullx
      pptl(4,nptl)=sqrt(pnullx**2+ams**2)
      pptl(5,nptl)=ams
      ifrptl(1,nptl)=0
      ifrptl(2,nptl)=0
      ityptl(nptl)=0
      enddo
      if(abs(idprojin).eq.12)then   !electron for fake DIS
c electron projectile
        nptl=nptl+1
        id=idprojin
        call idmass(id,ams)
        idptl(nptl)=id
        pptl(1,nptl)=0.
        pptl(2,nptl)=0.
        pptl(3,nptl)=sqrt(max(0.,(elepti+ams)*(elepti-ams)))
        pptl(4,nptl)=elepti
        pptl(5,nptl)=ams
        ifrptl(1,nptl)=1
        ifrptl(2,nptl)=1
        ityptl(nptl)=40
c target nucleons (in lab frame)
        do i=1,matarg
          nptl=nptl+1
          idptl(nptl)=idptl(maproj+i)
          pptl(1,nptl)=0.
          pptl(2,nptl)=0.
          pptl(3,nptl)=-pnll
          pptl(4,nptl)=ebeam
          pptl(5,nptl)=pptl(5,maproj+i)
          ifrptl(1,nptl)=maproj+i
          ifrptl(2,nptl)=maproj+i
          ityptl(nptl)=50
        enddo
c electron remnant
        nptl=nptl+1
        idptl(nptl)=id
        pptl(1,nptl)=phoele(1)
        pptl(2,nptl)=phoele(2)
        pptl(3,nptl)=phoele(3)
        pptl(4,nptl)=phoele(4)
        pptl(5,nptl)=ams
        ifrptl(1,nptl)=0
        ifrptl(2,nptl)=0
        ityptl(nptl)=40
      endif

      else

      nptl=nptl+1
      id=idproj
      call idmass(id,ams)
      idptl(nptl)=id
      pptl(1,nptl)=0.
      pptl(2,nptl)=0.
      pptl(3,nptl)=pnullx
      pptl(4,nptl)=sqrt(pnullx**2+ams**2)
      pptl(5,nptl)=ams
      ifrptl(1,nptl)=0
      ifrptl(2,nptl)=0
      ityptl(nptl)=0
      iorptl(nptl)=-1
      jorptl(nptl)=0
      istptl(nptl)=0
      do 5 i=1,4
 5      xorptl(i,nptl)=0
      tivptl(1,nptl)=0
      tivptl(2,nptl)=0
      endif

c     exit
c     ----

      call utprix('conwr ',ish,ishini,6)
      return
      end

c------------------------------------------------------------------------
      subroutine conxyz(ch,n,x,y,z,ynuc)
c-----------------------------------------------------------------------
      include 'epos.inc'

      real x(n),y(n),z(n)
      character ch*1

      massnr=0
      iii=0
      if(ch.eq.'p')then
      massnr=maproj
      iii=1
      elseif(ch.eq.'t')then
      massnr=matarg
      iii=2
      else
      call utstop('conxyz: nucleus neither proj nor targ&')
      endif

      if(massnr.eq.0)return
      if(massnr.gt.n)call utstop('conxyz: massnr.gt.n&')
      if(massnr.eq.1)then
      x(1)=0
      y(1)=0
      z(1)=0
      return
      endif

      rad=radnuc(massnr)

      if(massnr.ge.10)then !---wood-saxon density---

        rad=rad/difnuc(massnr)
        cr1=1.+3./rad+6./rad**2+6./rad**3
        cr2=3./rad
        cr3=3./rad+6./rad**2
        do i=1,massnr
   1      zuk=rangen()*cr1-1.
          if(zuk.le.0.)then
            tt=rad*(rangen()**.3333-1.)
          elseif(zuk.le.cr2 )then
            tt=-log(rangen())
          elseif(zuk.lt.cr3 )then
            tt=-log(rangen())-log(rangen())
          else
            tt=-log(rangen())-log(rangen())-log(rangen())
          endif
          if(rangen().gt.1./(1.+exp(-abs(tt))))goto 1
          rim=tt+rad
          zz=rim*(2.*rangen()-1.)
          rim=sqrt(rim*rim-zz*zz)
          z(i)=zz*difnuc(massnr)
          call pscs(c,s)
          x(i)=rim*c*difnuc(massnr)
          y(i)=rim*s*difnuc(massnr)
        enddo

      elseif(massnr.ge.3)then  ! ---gaussian density---

        rad=rad*sqrt(2.*massnr/(massnr-1.))   !van hove simulation
        do l=1,3
          summ=0.
          do i=1,massnr-1
            j=massnr-i
            aks=rad *(rangen()+rangen()+rangen()-1.5)
            k=j+1
            if(l.eq.1)x(k)=summ-aks*sqrt(float(j)/k)
            if(l.eq.2)y(k)=summ-aks*sqrt(float(j)/k)
            if(l.eq.3)z(k)=summ-aks*sqrt(float(j)/k)
            summ=summ+aks/sqrt(float(j*k))
          enddo
          if(l.eq.1)x(1)=summ
          if(l.eq.2)y(1)=summ
          if(l.eq.3)z(1)=summ
        enddo

      elseif(massnr.eq.2)then  ! ---deuteron---

        !.........r=t*difnuc(massnr), t~exp(-2*t)*(1-exp(-a*t))
        a=radnuc(massnr)
  2     t=-0.5*alog(rangen())  !~exp(-2*t)
        if(rangen().gt.(1-exp(-a*t))**2)goto2
        r=t*difnuc(massnr)
        zz=r*(2.*rangen()-1.)
        call pscs(c,s)
        rxy=sqrt(r*r-zz*zz)
        z(1)=0.5*zz
        x(1)=0.5*rxy*c
        y(1)=0.5*rxy*s
        z(2)=-z(1)
        x(2)=-x(1)
        y(2)=-y(1)

      else

        stop'conxyz: wrong massnr.     '

      endif

c...plot preparation

      rmax=(radnuc(massnr)+3)
      drnucl(iii)=rmax/mxnucl
      nrnucl(iii)=nrnucl(iii)+1
      do i=1,massnr
        r=sqrt(x(i)**2+y(i)**2+z(i)**2)
        k=1+int(r/drnucl(iii))
        if(k.le.mxnucl)rnucl(k,iii)=rnucl(k,iii)+1
      enddo

c...lorentz trafo

      do i=1,massnr
      z(i)=z(i)/cosh(ynuc)
      enddo

      return
      end

c-----------------------------------------------------------------------
      subroutine conini
c-----------------------------------------------------------------------
      include 'epos.inc'

      imax=max(maproj,matarg)
      if(idtargin.eq.0)imax=max(imax,40)
      do massnr=1,mamxx
        dif=0.54
        rad=0.
        if(massnr.gt.imax.or.massnr.eq.1)then
          dif=0
          rad=0
        elseif(massnr.eq.197)then
          dif=0.562
          rad=6.5
        elseif(massnr.ge.10)then
          rad=1.12*massnr**0.33333-0.86*massnr**(-0.33333)
        elseif(massnr.ge.3)then
          rad=.9*float(massnr)**.3333
        elseif(massnr.eq.2)then
          dif=4.316
          rad=4.68
        endif
        difnuc(massnr)=dif
        radnuc(massnr)=rad
      enddo

      end

c-----------------------------------------------------------------------
      subroutine xConNuclDens(iii)
c-----------------------------------------------------------------------
c plots distribution of nucleons in nuclei
c  iii = 1 (proj) or 2 (targ)
c-----------------------------------------------------------------------
      include 'epos.inc'
      if(model.ne.1)return
      massnr=1
      if(iii.eq.1)then
        massnr=maproj
      elseif(iii.eq.2)then
        massnr=matarg
      endif
      if(massnr.eq.1)return
      a=1./4.316
      b=4.68
      write(ifhi,'(a)') '!-----------------------------------------'
      write(ifhi,'(a)') '!          nuclear density          '
      write(ifhi,'(a)') '!-----------------------------------------'
      write(ifhi,'(a)')       'openhisto'
      if(massnr.ge.10)write(ifhi,'(a)')'htyp lin xmod lin ymod lin'
      if(massnr.lt.10)write(ifhi,'(a)')'htyp lin xmod lin ymod log'
      write(ifhi,'(a)')       'text 0 0 "title nuclear density"'
      write(ifhi,'(a)')       'text 0.99 -0.15 " r (fm) "'
      write(ifhi,'(a)')       'text 0 0 "yaxis rho(r)"'
      write(ifhi,'(a,2e11.3)')'xrange',0.,mxnucl*drnucl(iii)
      write(ifhi,'(3a)')'yrange',' 0 ',' auto'
      write(ifhi,'(a)')       'array 2'
      do j=1,mxnucl
      r=(j-0.5)*drnucl(iii)
      d=0.5*drnucl(iii)
      write(ifhi,'(2e12.4)')  r,rnucl(j,iii)/nrnucl(iii)/
     *                     (4./3.*pi*((r+d)**3-(r-d)**3))
      enddo
      write(ifhi,'(a)')       '  endarray'
      write(ifhi,'(a)')       'closehisto plot 0-'
      write(ifhi,'(a)')       'openhisto'
      write(ifhi,'(a)')       'htyp lbo '
      write(ifhi,'(a)')       'array 2'
      do j=1,mxnucl
      r=(j-0.5)*drnucl(iii)
      rr=2*r
      rho=1
      if(massnr.eq.2)then
        rho=1.00*((1-exp(-b*a*rr))*exp(-a*rr)/rr)**2
      elseif(massnr.eq.197)then
        rho=0.16/(1+exp((r-6.5)/0.562))
      elseif(massnr.ge.10)then
        rho=0.16/(1+exp((r-radnuc(massnr))/difnuc(massnr)))
      endif
      write(ifhi,'(2e12.4)')  r,rho
      enddo
      write(ifhi,'(a)')       '  endarray'
      write(ifhi,'(a)')       'closehisto plot 0'
      end

c-----------------------------------------------------------------------
      subroutine xConThick(iii)
c-----------------------------------------------------------------------
      ! plots sigma_pp *T_A (b)  (=average number of collisions)
      ! T_A = thickness function
      !  iii = 1 (proj) or 2 (targ)
      !----------------------------------------------------------------
      include 'epos.inc'
      parameter(iconimax=20,iconkmax=100)
      real thick(2,0:iconimax)
      imax=iconimax
      kmax=iconkmax
      if(model.ne.1)return
      ramx=mxnucl*drnucl(iii)
      do i=0,imax
        x=i/float(imax)*ramx
        sum=0
        rho0=conrho(iii,0.)
        h=ramx/kmax
        do k=1,kmax
          z=k*h
          r=sqrt(x*x+z*z)
          rho2=conrho(iii,r)
          z=(k-0.5)*h
          r=sqrt(x*x+z*z)
          rho1=conrho(iii,r)
          sum=sum+h/6.*(rho0+4*rho1+rho2)
          rho0=rho2
        enddo
        sum=sum*2 ! integral fro -infty to +infty
        thick(1,i)=x
        thick(2,i)=sum
      enddo
      write(ifhi,'(a)')       'openhisto'
      write(ifhi,'(a)')       'htyp lbo '
      write(ifhi,'(a)')       'txt "xaxis b (fm)" '
      write(ifhi,'(a)')       'txt "yaxis [s]?pp! T?A! (b) " '
      write(ifhi,'(a)')       'array 2'
      do i=0,imax
        write(ifhi,'(2e12.4)') thick(1,i),sigine/10.*thick(2,i)
      enddo
      write(ifhi,'(a)')       '  endarray'
      write(ifhi,'(a)')       'closehisto plot 0'

      end

c-----------------------------------------------------------------------
      function conrho(iii,r)
c-----------------------------------------------------------------------
      ! nuclear density
      !  iii = 1 (proj) or 2 (targ)
      !----------------------------------------------------------------
      include 'epos.inc'
      conrho=1.
      if(model.ne.1)return
      massnr=1
      if(iii.eq.1)then
        massnr=maproj
      elseif(iii.eq.2)then
        massnr=matarg
      endif
      if(massnr.eq.1)return
      a=1./4.316
      b=4.68
      rr=2*r
      rho=1
      if(massnr.eq.2.and.rr.gt.0.)then
        rho=1.00*((1-exp(-b*a*rr))*exp(-a*rr)/rr)**2
      elseif(massnr.eq.197)then
        rho=0.16/(1+exp((r-6.5)/0.562))
      elseif(massnr.ge.10)then
        rho=0.16/(1+exp((r-radnuc(massnr))/difnuc(massnr)))
      endif
      conrho=rho
      end