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1 // 2 // ******************************************************************** 3 // * License and Disclaimer * 4 // * * 5 // * The Geant4 software is copyright of the Copyright Holders of * 6 // * the Geant4 Collaboration. It is provided under the terms and * 7 // * conditions of the Geant4 Software License, included in the file * 8 // * LICENSE and available at http://cern.ch/geant4/license . These * 9 // * include a list of copyright holders. * 10 // * * 11 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitation of liability. * 17 // * * 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************************************** 25 // 26 27 #include "G4NuclearShellModelDensity.hh" 28 #include "G4PhysicalConstants.hh" 29 #include "G4SystemOfUnits.hh" 30 #include "G4Exp.hh" 31 #include "G4Log.hh" 32 #include "G4Pow.hh" 33 34 G4NuclearShellModelDensity::G4NuclearShellModelDensity(G4int anA, G4int /*aZ*/) 35 : theA(anA)//, theZ(aZ) 36 { 37 const G4double r0sq=0.8133*fermi*fermi; 38 theRsquare= r0sq * G4Pow::GetInstance()->Z23(theA); 39 G4double x = 1./(pi*theRsquare); 40 Setrho0(x*std::sqrt(x)); 41 } 42 43 G4NuclearShellModelDensity::~G4NuclearShellModelDensity() {} 44 45 G4double G4NuclearShellModelDensity::GetRelativeDensity(const G4ThreeVector & aPosition) const 46 { 47 return G4Exp(-1*aPosition.mag2()/theRsquare); 48 } 49 50 G4double G4NuclearShellModelDensity::GetRadius(const G4double maxRelativeDensity) const 51 { 52 53 return (maxRelativeDensity>0 && maxRelativeDensity <= 1 ) ? 54 std::sqrt(theRsquare * G4Log(1/maxRelativeDensity) ) : DBL_MAX; 55 } 56 57 G4double G4NuclearShellModelDensity::GetDeriv(const G4ThreeVector & aPosition) const 58 { 59 return -2* aPosition.mag() / theRsquare * GetDensity(aPosition); 60 } 61