G4SmpGEng.cc

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// Copyright (c) 2006 The Regents of the University of California.
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// UCRL-CODE-224807
//
//
// $Id: G4SmpGEng.cc 67966 2013-03-13 09:38:38Z gcosmo $
//

#include <cmath>
#include "G4fissionEvent.hh"

G4double G4fissionEvent::G4SmpGEng() {

/*
  Description
    Sample energy spectrum for photons emitted by fission-induced reactions. 
    The energy spectrum of the prompt fission gamma rays is obtained from
    Maienschein's measurements.
*/

/*
  Input
  Return
    energy of photon emitted by neutron-induced fission
*/

   G4double r;
/*
  Calculate the energy of photons emitted from fission
*/
   r=fisslibrng();

   if (r == 0.0) return 0.085;

   if (r <= 0.0001) return 0.0855+0.01692*(r/0.0001)-0.02401*std::pow(r/0.0001,2.)+0.01274*std::pow(r/0.0001,3.);

   if (r > 0.0001 && r <= 0.01) return 0.09141 +  0.23846*((r-0.0001)/0.0099) 
                               -  1.75947*std::pow((r-.0001)/0.0099,2.)
                                               + 10.98611*std::pow((r-0.0001)/0.0099,3.)
                                               - 43.19181*std::pow((r-.0001)/0.0099,4.)
                                               +105.70005*std::pow((r-.0001)/.0099,5.)
                                               -160.72894*std::pow((r-.0001)/.0099,6.)
                                               +147.43399*std::pow((r-.0001)/.0099,7.)
                                               - 74.60043*std::pow((r-.0001)/0.0099,8.)
                                               + 15.97547*std::pow((r-.0001)/0.0099,9.);

   if (r > 0.01 && r <= 0.1537) return 0.14486 + 0.40914*((r-.01)/.1437)
                               - 1.28150*std::pow((r-0.01)/0.1437,2.)
                                               + 5.07377*std::pow((r-0.01)/0.1437,3.)
                                               -15.42031*std::pow((r-0.01)/0.1437,4.)
                                               +31.96346*std::pow((r-0.01)/0.1437,5.)
                                               -43.12605*std::pow((r-0.01)/0.1437,6.)
                                               +36.02908*std::pow((r-0.01)/0.1437,7.)
                                               -16.87185*std::pow((r-0.01)/0.1437,8.)
                                               + 3.37941*std::pow((r-0.01)/0.1437,9.);

   if (r > 0.1537 && r <= 0.7114) return (-1./2.3)*std::log(0.71956*(0.1537-r)+0.50158);

   if (r > 0.7114 && r <= 1.0) return (-1./1.1)*std::log(1.15292*(0.7114-r)+0.33287);
   //
   // Fall through 
   //
   G4cout << " Random number out of range in SmpGEng " << G4endl;
   return -1.0;
}