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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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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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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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // |
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28 | |
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29 | #include "G4NuclearShellModelDensity.hh" |
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30 | |
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31 | G4NuclearShellModelDensity::G4NuclearShellModelDensity(G4int anA, G4int aZ) |
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32 | : theA(anA), theZ(aZ) |
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33 | { |
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34 | const G4double r0sq=0.8133*fermi*fermi; |
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35 | theRsquare= r0sq * std::pow(G4double(theA), 2./3. ); |
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36 | Setrho0(std::pow(1./(pi*theRsquare),3./2.)); |
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37 | } |
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38 | |
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39 | G4NuclearShellModelDensity::~G4NuclearShellModelDensity() {} |
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40 | |
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41 | G4double G4NuclearShellModelDensity::GetRelativeDensity(const G4ThreeVector & aPosition) const |
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42 | { |
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43 | return std::exp(-1*aPosition.mag2()/theRsquare); |
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44 | } |
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45 | |
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46 | G4double G4NuclearShellModelDensity::GetRadius(const G4double maxRelativeDensity) const |
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47 | { |
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48 | |
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49 | return (maxRelativeDensity>0 && maxRelativeDensity <= 1 ) ? |
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50 | std::sqrt(theRsquare * std::log(1/maxRelativeDensity) ) : DBL_MAX; |
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51 | } |
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52 | |
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53 | G4double G4NuclearShellModelDensity::GetDeriv(const G4ThreeVector & aPosition) const |
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54 | { |
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55 | return -2* aPosition.mag() / theRsquare * GetDensity(aPosition); |
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56 | } |
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