4.3.14 SUBROUTINE ZDMPAR(P, ATMNB, NEWTRK, ERROR) : Make e+e- PAiR

This routine generates a e+e- pair from a gamma momentum P, and returns the momenta of positron and of the electron created in NEWTRK.

ARGUMENTS:

INPUT :

    P : 4-momentum of the incomming gamma (in GeV/c)
    ATMNB : Atom-number of the material

OUTPUT :

    NEWTRK(1-3,1) : 4-momentum of the out-going electron (in GeV/c)
    NEWTRK(1-3,2) :     "      "   "   "    "   positron (in GeV/c)
    ERROR : Error-flag : 0 -> OK
                         1 -> Below cutoff
                         2 -> Exhausted number of iterations

IMPLICIT INPUTS:

    none.

IMPLICIT OUTPUTS:

    none.

CALLED BY :

ZDPAIR, generate PAIR production (see 4.3.10).

CALLED ROUTINE(S):

ZURECT (see 4.7.14)

(To get a RECTangular random-number)

ZDROPA (see 4.3.15)

(To ROtate the generated PAir.)

SIDE EFFECTS:

none

AUTHORS:

M. Berggren, UFRJ (adopted from DELSIM's SXPAR)

CREATION DATE:

03-apr-1996