G4NuclearAbrasionGeometry.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// *                                                                  *
// * Parts of this code which have been  developed by QinetiQ Ltd     *
// * under contract to the European Space Agency (ESA) are the        *
// * intellectual property of ESA. Rights to use, copy, modify and    *
// * redistribute this software for general public use are granted    *
// * in compliance with any licensing, distribution and development   *
// * policy adopted by the Geant4 Collaboration. This code has been   *
// * written by QinetiQ Ltd for the European Space Agency, under ESA  *
// * contract 17191/03/NL/LvH (Aurora Programme).                     *
// *                                                                  *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//
// MODULE:      G4NuclearAbrasionGeometry.cc
//
// Version:     B.1
// Date:        15/04/04
// Author:      P R Truscott
// Organisation:    QinetiQ Ltd, UK
// Customer:        ESA/ESTEC, NOORDWIJK
// Contract:        17191/03/NL/LvH
//
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//
// CHANGE HISTORY
// --------------
//
// 18 November 2003, P R Truscott, QinetiQ Ltd, UK
// Created.
//
// 15 March 2004, P R Truscott, QinetiQ Ltd, UK
// Beta release
//
// 4 June 2004, J.P. Wellisch, CERN, Switzerland
// resolving technical portability issues.
//
// 12 June 2012, A. Ribon, CERN, Switzerland
// Fixing trivial warning errors of shadowed variables. 
//
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
////////////////////////////////////////////////////////////////////////////////
//
#include "G4NuclearAbrasionGeometry.hh"
#include "G4WilsonRadius.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
////////////////////////////////////////////////////////////////////////////////
//
G4NuclearAbrasionGeometry::G4NuclearAbrasionGeometry (G4double AP1,
  G4double AT1, G4double r1)
{
//
//
// Initialise variables for interaction geometry.
//
  G4WilsonRadius aR;
  AP = AP1;
  AT = AT1;
  rP = aR.GetWilsonRadius(AP);
  rT = aR.GetWilsonRadius(AT);
  r  = r1;
  n  = rP / (rP + rT);
  b  = r / (rP + rT);
  m  = rT / rP;
  Q  = (1.0 - b)/n;
  S  = Q * Q;
  T  = S * Q;
  R  = std::sqrt(m*n);
  U  = 1.0/m - 2.0;
//
//
// Initialise the threshold radius-ratio at which interactions are considered
// peripheral or central.
//  
  rth = 2.0/3.0;
  B   = 10.0 * MeV;
}
////////////////////////////////////////////////////////////////////////////////
//
G4NuclearAbrasionGeometry::~G4NuclearAbrasionGeometry ()
{;}
////////////////////////////////////////////////////////////////////////////////
//
void G4NuclearAbrasionGeometry::SetPeripheralThreshold (G4double rth1)
  {if (rth1 > 0.0 && rth1 <= 1.0) rth = rth1;}
////////////////////////////////////////////////////////////////////////////////
//
G4double G4NuclearAbrasionGeometry::GetPeripheralThreshold ()
  {return rth;}
////////////////////////////////////////////////////////////////////////////////
//
G4double G4NuclearAbrasionGeometry::P ()
{
//
//
// Initialise the value for P, then determine the actual value depending upon
// whether the projectile is larger or smaller than the target and these radii
// in relation to the impact parameter.
//
  G4double valueP = 0.0;

  if (rT > rP)
  {
    if (rT-rP<=r && r<=rT+rP) valueP = 0.125*R*U*S - 0.125*(0.5*R*U+1.0)*T;
    else                      valueP = -1.0;
  }
  else
  {
    if (rP-rT<=r && r<=rP+rT) valueP = 0.125*R*U*S - 0.125*(0.5*std::sqrt(n/m)*U-
      (std::sqrt(1.0-m*m)/n - 1.0)*std::sqrt((2.0-m)/std::pow(m,5.0)))*T;
    else                      valueP = (std::sqrt(1.0-m*m)/n-1.0)*std::sqrt(1.0-b*b/n/n);
  }

  if (!(valueP <= 1.0 && valueP>= -1.0))
  {
    if (valueP > 1.0) valueP =  1.0;
    else         valueP = -1.0;
  }
  return valueP;
}
////////////////////////////////////////////////////////////////////////////////
//
G4double G4NuclearAbrasionGeometry::F ()
{
//
//
// Initialise the value for F, then determine the actual value depending upon
// whether the projectile is larger or smaller than the target and these radii
// in relation to the impact parameter.
//
  G4double valueF = 0.0;

  if (rT > rP)
  {
    if (rT-rP<=r && r<=rT+rP) valueF = 0.75*R*S - 0.125*(3.0*R-1.0)*T;
    else                      valueF = 1.0;
  }
  else
  {
    if (rP-rT<=r && r<=rP+rT) valueF = 0.75*R*S - 0.125*(3.0*std::sqrt(n/m)-
      (1.0-std::pow(1.0-m*m,3.0/2.0))*std::sqrt(1.0-std::pow(1.0-m,2.0))/std::pow(m,3.0))*T;
    else                      valueF = (1.0-std::pow(1.0-m*m,3.0/2.0))*std::sqrt(1.0-b*b/n/n);
  }

  if (!(valueF <= 1.0 && valueF>= 0.0))
  {
    if (valueF > 1.0) valueF = 1.0;
    else         valueF = 0.0;
  }
  return valueF;
}
////////////////////////////////////////////////////////////////////////////////
//
G4double G4NuclearAbrasionGeometry::GetExcitationEnergyOfProjectile ()
{
  G4double F1 = F();
  G4double P1 = P();
  G4double Es = 0.0;

  Es = 0.95 * MeV * 4.0 * pi * rP*rP/fermi/fermi *
       (1.0+P1-std::pow(1.0-F1,2.0/3.0));
//  if (rT < rP && r < rP-rT)
  if ((r-rP)/rT < rth)
  {
    G4double omega = 0.0;
    if      (AP < 12.0)  omega = 1500.0;
    else if (AP <= 16.0) omega = 1500.0 - 320.0*(AP-12.0);
    Es *= 1.0 + F1*(5.0+omega*F1*F1);
  }
  
  if (Es < 0.0) 
    Es = 0.0;
  else if (Es > B * AP)
    Es = B * AP;
  return Es;
}


G4double G4NuclearAbrasionGeometry::GetExcitationEnergyOfTarget ()
{
  // This member function declares a new G4NuclearAbrasionGeometry object 
  // but with the projectile and target exchanged to determine the values
  // for F and P.  Determination of the excess surface area and excitation
  // energy is as above.

  G4NuclearAbrasionGeometry* revAbrasionGeometry =
    new G4NuclearAbrasionGeometry(AT, AP, r);
  G4double F1 = revAbrasionGeometry->F();
  G4double P1 = revAbrasionGeometry->P();
  G4double Es = 0.0;

  Es = 0.95 * MeV * 4.0 * pi * rT*rT/fermi/fermi *
       (1.0+P1-std::pow(1.0-F1,2.0/3.0));

//  if (rP < rT && r < rT-rP)
  if ((r-rT)/rP < rth) {
    G4double omega = 0.0;
    if      (AT < 12.0)  omega = 1500.0;
    else if (AT <= 16.0) omega = 1500.0 - 320.0*(AT-12.0);
    Es *= 1.0 + F1*(5.0+omega*F1*F1);
  }
  
  if (Es < 0.0)
    Es = 0.0;
  else if (Es > B * AT)
    Es = B * AT;

  delete revAbrasionGeometry;

  return Es;
}