[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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[1340] | 26 | // $Id: G4HETCAlpha.cc,v 1.4 2010/08/28 15:16:55 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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| 28 | // |
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| 29 | // by V. Lara |
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| 30 | // |
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| 31 | // Modified: |
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| 32 | // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor |
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| 33 | // the source, use G4Pow |
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| 34 | |
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[819] | 35 | #include "G4HETCAlpha.hh" |
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[1340] | 36 | #include "G4Alpha.hh" |
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[819] | 37 | |
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[1340] | 38 | G4HETCAlpha::G4HETCAlpha() |
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| 39 | : G4HETCChargedFragment(G4Alpha::Alpha(), &theAlphaCoulombBarrier) |
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| 40 | {} |
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| 41 | |
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| 42 | G4HETCAlpha::~G4HETCAlpha() |
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| 43 | {} |
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| 44 | |
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| 45 | G4double G4HETCAlpha::GetAlpha() |
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| 46 | { |
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| 47 | G4double C = 0.0; |
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| 48 | G4int aZ = GetZ() + GetRestZ(); |
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| 49 | if (aZ <= 30) |
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| 50 | { |
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| 51 | C = 0.10; |
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| 52 | } |
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| 53 | else if (aZ <= 50) |
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| 54 | { |
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| 55 | C = 0.1 + -((aZ-50.)/20.)*0.02; |
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| 56 | } |
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| 57 | else if (aZ < 70) |
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| 58 | { |
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| 59 | C = 0.08 + -((aZ-70.)/20.)*0.02; |
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| 60 | } |
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| 61 | else |
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| 62 | { |
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| 63 | C = 0.06; |
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| 64 | } |
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| 65 | return 1.0+C; |
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| 66 | } |
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| 67 | |
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| 68 | G4double G4HETCAlpha::GetBeta() |
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| 69 | { |
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| 70 | return -GetCoulombBarrier(); |
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| 71 | } |
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| 72 | |
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| 73 | G4double G4HETCAlpha::GetSpinFactor() |
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| 74 | { |
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| 75 | return 1.0; |
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| 76 | } |
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| 77 | |
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[819] | 78 | G4double G4HETCAlpha::K(const G4Fragment & aFragment) |
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| 79 | { |
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[1340] | 80 | // Number of protons in emitted fragment |
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| 81 | G4int Pa = GetZ(); |
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| 82 | // Number of neutrons in emitted fragment |
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| 83 | G4int Na = GetA() - Pa; |
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[819] | 84 | |
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[1340] | 85 | G4int TargetZ = GetRestZ(); |
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| 86 | G4int TargetA = GetRestA(); |
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| 87 | G4double r = G4double(TargetZ)/G4double(TargetA); |
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[819] | 88 | |
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[1340] | 89 | G4int P = aFragment.GetNumberOfParticles(); |
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| 90 | G4int H = aFragment.GetNumberOfHoles(); |
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| 91 | |
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[819] | 92 | G4double result = 0.0; |
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| 93 | if (P > 3) |
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| 94 | { |
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| 95 | result = 3.0/(P*(P-1.0)*(P-2.0)*(P-3.0)) * |
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| 96 | (H*(H-1.0)*(H-2.0)*(H-3.0)*r*r*(r-1.0)*(r-1.0) + |
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| 97 | 2.0*H*(H-1.0)*(H-2.0)*(Pa*r*(1.0-r)*(1.0-r)+Na*r*r*(1.0-r)) + |
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| 98 | H*(H-1.0)*(Pa*(Pa-1.0)*(1.0-r)*(1.0-r)+4.0*Na*Pa*r*(1.0-r)+Na*(Na-1.0)*r*r) + |
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| 99 | 2*H*(Pa*Na*(Na-1.0)*r+Pa*(Pa-1.0)*Na*(1.0-r)) + |
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| 100 | Pa*(Pa-1.0)*Na*(Na-1.0)); |
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| 101 | |
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[1340] | 102 | result /= 6.0*r*r*(1. - r) *(1. - r); |
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[819] | 103 | } |
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| 104 | return std::max(0.0,result); |
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| 105 | } |
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