Gabriele Cosmo
231 lines
7.7 KiB
C++
231 lines
7.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * *
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// * Parts of this code which have been developed by QinetiQ Ltd *
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// * under contract to the European Space Agency (ESA) are the *
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// * intellectual property of ESA. Rights to use, copy, modify and *
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// * redistribute this software for general public use are granted *
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// * in compliance with any licensing, distribution and development *
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// * policy adopted by the Geant4 Collaboration. This code has been *
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// * written by QinetiQ Ltd for the European Space Agency, under ESA *
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// * contract 17191/03/NL/LvH (Aurora Programme). *
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// * *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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//
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// MODULE: G4NuclearAbrasionGeometry.cc
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//
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// Version: B.1
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// Date: 15/04/04
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// Author: P R Truscott
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// Organisation: QinetiQ Ltd, UK
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// Customer: ESA/ESTEC, NOORDWIJK
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// Contract: 17191/03/NL/LvH
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//
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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//
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// CHANGE HISTORY
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// --------------
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//
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// 18 November 2003, P R Truscott, QinetiQ Ltd, UK
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// Created.
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//
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// 15 March 2004, P R Truscott, QinetiQ Ltd, UK
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// Beta release
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//
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// 4 June 2004, J.P. Wellisch, CERN, Switzerland
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// resolving technical portability issues.
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//
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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////////////////////////////////////////////////////////////////////////////////
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//
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#include "G4NuclearAbrasionGeometry.hh"
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#include "G4WilsonRadius.hh"
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////////////////////////////////////////////////////////////////////////////////
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//
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G4NuclearAbrasionGeometry::G4NuclearAbrasionGeometry (G4double AP1,
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G4double AT1, G4double r1)
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{
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//
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//
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// Initialise variables for interaction geometry.
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//
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G4WilsonRadius aR;
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AP = AP1;
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AT = AT1;
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rP = aR.GetWilsonRadius(AP);
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rT = aR.GetWilsonRadius(AT);
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r = r1;
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n = rP / (rP + rT);
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b = r / (rP + rT);
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m = rT / rP;
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Q = (1.0 - b)/n;
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S = Q * Q;
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T = S * Q;
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R = std::sqrt(m*n);
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U = 1.0/m - 2.0;
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//
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//
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// Initialise the threshold radius-ratio at which interactions are considered
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// peripheral or central.
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//
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rth = 2.0/3.0;
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B = 10.0 * MeV;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4NuclearAbrasionGeometry::~G4NuclearAbrasionGeometry ()
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{;}
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////////////////////////////////////////////////////////////////////////////////
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//
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void G4NuclearAbrasionGeometry::SetPeripheralThreshold (G4double rth1)
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{if (rth1 > 0.0 && rth1 <= 1.0) rth = rth1;}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4NuclearAbrasionGeometry::GetPeripheralThreshold ()
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{return rth;}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4NuclearAbrasionGeometry::P ()
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{
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//
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//
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// Initialise the value for P, then determine the actual value depending upon
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// whether the projectile is larger or smaller than the target and these radii
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// in relation to the impact parameter.
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//
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G4double P = 0.0;
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if (rT > rP)
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{
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if (rT-rP<=r && r<=rT+rP) P = 0.125*R*U*S - 0.125*(0.5*R*U+1.0)*T;
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else P = -1.0;
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}
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else
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{
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if (rP-rT<=r && r<=rP+rT) P = 0.125*R*U*S - 0.125*(0.5*std::sqrt(n/m)*U-
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(std::sqrt(1.0-m*m)/n - 1.0)*std::sqrt((2.0-m)/std::pow(m,5.0)))*T;
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else P = (std::sqrt(1.0-m*m)/n-1.0)*std::sqrt(1.0-b*b/n/n);
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}
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if (!(P <= 1.0 && P>= -1.0))
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{
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if (P > 1.0) P = 1.0;
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else P = -1.0;
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}
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return P;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4NuclearAbrasionGeometry::F ()
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{
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//
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//
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// Initialise the value for F, then determine the actual value depending upon
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// whether the projectile is larger or smaller than the target and these radii
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// in relation to the impact parameter.
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//
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G4double F = 0.0;
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if (rT > rP)
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{
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if (rT-rP<=r && r<=rT+rP) F = 0.75*R*S - 0.125*(3.0*R-1.0)*T;
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else F = 1.0;
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}
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else
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{
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if (rP-rT<=r && r<=rP+rT) F = 0.75*R*S - 0.125*(3.0*std::sqrt(n/m)-
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(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;
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else F = (1.0-std::pow(1.0-m*m,3.0/2.0))*std::sqrt(1.0-b*b/n/n);
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}
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if (!(F <= 1.0 && F>= 0.0))
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{
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if (F > 1.0) F = 1.0;
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else F = 0.0;
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}
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return F;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4NuclearAbrasionGeometry::GetExcitationEnergyOfProjectile ()
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{
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G4double F1 = F();
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G4double P1 = P();
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G4double Es = 0.0;
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Es = 0.95 * MeV * 4.0 * pi * rP*rP/fermi/fermi *
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(1.0+P1-std::pow(1.0-F1,2.0/3.0));
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// if (rT < rP && r < rP-rT)
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if ((r-rP)/rT < rth)
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{
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G4double omega = 0.0;
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if (AP < 12.0) omega = 1500.0;
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else if (AP <= 16.0) omega = 1500.0 - 320.0*(AP-12.0);
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Es *= 1.0 + F1*(5.0+omega*F1*F1);
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}
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if (Es < 0.0)
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Es = 0.0;
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else if (Es > B * AP)
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Es = B * AP;
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return Es;
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}
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//////////////////////////////////////////////////////////////////////////////////////
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//
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G4double G4NuclearAbrasionGeometry::GetExcitationEnergyOfTarget ()
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{
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//
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//
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// This member function declares a new G4NuclearAbrasionGeometry object but with the
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// projectile and target exchanged to determine the values for F and P. Determination
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// of the excess surface area and excitation energy is as above.
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//
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G4NuclearAbrasionGeometry *revAbrasionGeometry =
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new G4NuclearAbrasionGeometry(AT, AP, r);
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G4double F1 = revAbrasionGeometry->F();
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G4double P1 = revAbrasionGeometry->P();
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G4double Es = 0.0;
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Es = 0.95 * MeV * 4.0 * pi * rT*rT/fermi/fermi *
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(1.0+P1-std::pow(1.0-F1,2.0/3.0));
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// if (rP < rT && r < rT-rP)
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if ((r-rT)/rP < rth)
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{
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G4double omega = 0.0;
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if (AT < 12.0) omega = 1500.0;
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else if (AT <= 16.0) omega = 1500.0 - 320.0*(AT-12.0);
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Es *= 1.0 + F1*(5.0+omega*F1*F1);
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}
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if (Es < 0.0)
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Es = 0.0;
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else if (Es > B * AT)
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Es = B * AT;
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return Es;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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