Gabriele Cosmo
532 lines
14 KiB
C++
532 lines
14 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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// * 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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// GEANT 4 class implementation file
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//
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// History: first implementation, based on object model of
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// 10 oct 1998 H.Kurashige
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//
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// Update mass and width following PDG 2023
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// 4 nov 2023 S.Okada
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// ---------------------------------------------------------------
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#include "G4ExcitedDeltaConstructor.hh"
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#include "G4DecayTable.hh"
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#include "G4PhaseSpaceDecayChannel.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4VDecayChannel.hh"
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G4ExcitedDeltaConstructor::G4ExcitedDeltaConstructor()
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: G4ExcitedBaryonConstructor(NStates, DeltaIsoSpin)
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{}
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G4int G4ExcitedDeltaConstructor::GetEncoding(G4int iIsoSpin3, G4int idxState)
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{
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G4int encoding;
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// Delta has exceptinal encoding
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if ((idxState == 1) || (idxState == 3) || (idxState == 4) || (idxState == 5) || (idxState == 7)) {
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encoding = GetEncodingOffset(idxState);
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if ((iIsoSpin3 == 3) || (iIsoSpin3 == -3)) {
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// normal encoding
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encoding += 1000 * GetQuarkContents(0, iIsoSpin3);
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encoding += 100 * GetQuarkContents(1, iIsoSpin3);
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encoding += 10 * GetQuarkContents(2, iIsoSpin3);
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}
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else if (iIsoSpin3 == +1) {
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// 1st <--> 2nd quark
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encoding += 1000 * GetQuarkContents(0, iIsoSpin3);
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encoding += 10 * GetQuarkContents(1, iIsoSpin3);
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encoding += 100 * GetQuarkContents(2, iIsoSpin3);
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}
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else if (iIsoSpin3 == -1) {
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// 1st <--> 0th quark
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encoding += 100 * GetQuarkContents(0, iIsoSpin3);
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encoding += 1000 * GetQuarkContents(1, iIsoSpin3);
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encoding += 10 * GetQuarkContents(2, iIsoSpin3);
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}
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encoding += GetiSpin(idxState) + 1;
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}
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else {
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encoding = G4ExcitedBaryonConstructor::GetEncoding(iIsoSpin3, idxState);
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}
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return encoding;
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}
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G4DecayTable* G4ExcitedDeltaConstructor::CreateDecayTable(const G4String& parentName, G4int iIso3,
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G4int iState, G4bool fAnti)
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{
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// create decay table
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auto decayTable = new G4DecayTable();
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G4double br;
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if ((br = bRatio[iState][NGamma]) > 0.0) {
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AddNGammaMode(decayTable, parentName, br, iIso3, fAnti);
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}
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if ((br = bRatio[iState][NPi]) > 0.0) {
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AddNPiMode(decayTable, parentName, br, iIso3, fAnti);
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}
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if ((br = bRatio[iState][NRho]) > 0.0) {
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AddNRhoMode(decayTable, parentName, br, iIso3, fAnti);
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}
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if ((br = bRatio[iState][DeltaPi]) > 0.0) {
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AddDeltaPiMode(decayTable, parentName, br, iIso3, fAnti);
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}
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if ((br = bRatio[iState][NStarPi]) > 0.0) {
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AddNStarPiMode(decayTable, parentName, br, iIso3, fAnti);
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}
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return decayTable;
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}
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G4DecayTable* G4ExcitedDeltaConstructor::AddNGammaMode(G4DecayTable* decayTable,
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const G4String& nameParent, G4double br,
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G4int iIso3, G4bool fAnti)
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{
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G4VDecayChannel* mode;
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//
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G4String daughterN;
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if (iIso3 == +1) {
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daughterN = "proton";
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}
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else if (iIso3 == -1) {
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daughterN = "neutron";
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}
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else {
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// can not decay into N+gamma
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return decayTable;
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}
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if (fAnti) daughterN = "anti_" + daughterN;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, br, 2, daughterN, "gamma");
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// add decay table
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decayTable->Insert(mode);
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return decayTable;
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}
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G4DecayTable* G4ExcitedDeltaConstructor::AddNPiMode(G4DecayTable* decayTable,
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const G4String& nameParent, G4double br,
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G4int iIso3, G4bool fAnti)
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{
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G4VDecayChannel* mode;
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G4String daughterN;
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G4String daughterPi;
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G4double r = 0.;
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// ------------ N pi0 ------------
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// determine daughters
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if ((iIso3 == +1) || (iIso3 == -1)) {
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if (iIso3 == +1) {
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daughterN = "proton";
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daughterPi = "pi0";
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r = br * 2. / 3.;
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}
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else if (iIso3 == -1) {
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daughterN = "neutron";
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daughterPi = "pi0";
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r = br / 3.;
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}
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if (fAnti) daughterN = "anti_" + daughterN;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterN, daughterPi);
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// add decay table
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decayTable->Insert(mode);
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}
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// -------------N pi +/- --------------
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// determine daughters
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if (iIso3 == +3) {
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daughterN = "proton";
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if (!fAnti) {
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daughterPi = "pi+";
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}
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else {
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daughterPi = "pi-";
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}
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r = br;
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}
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else if (iIso3 == +1) {
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daughterN = "neutron";
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if (!fAnti) {
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daughterPi = "pi+";
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}
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else {
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daughterPi = "pi-";
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}
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r = br / 3.;
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}
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else if (iIso3 == -1) {
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daughterN = "proton";
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if (!fAnti) {
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daughterPi = "pi-";
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}
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else {
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daughterPi = "pi+";
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}
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r = br * 2. / 3.;
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}
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else if (iIso3 == -3) {
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daughterN = "neutron";
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if (!fAnti) {
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daughterPi = "pi-";
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}
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else {
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daughterPi = "pi+";
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}
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r = br;
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}
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if (fAnti) daughterN = "anti_" + daughterN;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterN, daughterPi);
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// add decay table
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decayTable->Insert(mode);
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return decayTable;
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}
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G4DecayTable* G4ExcitedDeltaConstructor::AddNRhoMode(G4DecayTable* decayTable,
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const G4String& nameParent, G4double br,
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G4int iIso3, G4bool fAnti)
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{
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G4VDecayChannel* mode;
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G4String daughterN;
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G4String daughterRho;
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G4double r = 0.;
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// ------------ N Rho0 ------------
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// determine daughters
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if ((iIso3 == +1) || (iIso3 == -1)) {
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if (iIso3 == +1) {
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daughterN = "proton";
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daughterRho = "rho0";
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r = br * 2. / 3.;
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}
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else if (iIso3 == -1) {
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daughterN = "neutron";
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daughterRho = "rho0";
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r = br / 3.;
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}
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if (fAnti) daughterN = "anti_" + daughterN;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterN, daughterRho);
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// add decay table
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decayTable->Insert(mode);
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}
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// -------------N Rho +/- --------------
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// determine daughters
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if (iIso3 == +3) {
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daughterN = "proton";
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if (!fAnti) {
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daughterRho = "rho+";
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}
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else {
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daughterRho = "rho-";
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}
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r = br;
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}
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else if (iIso3 == +1) {
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daughterN = "neutron";
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if (!fAnti) {
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daughterRho = "rho+";
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}
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else {
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daughterRho = "rho-";
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}
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r = br / 3.;
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}
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else if (iIso3 == -1) {
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daughterN = "proton";
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if (!fAnti) {
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daughterRho = "rho-";
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}
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else {
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daughterRho = "rho+";
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}
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r = br * 2. / 3.;
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}
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else if (iIso3 == -3) {
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daughterN = "neutron";
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if (!fAnti) {
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daughterRho = "rho-";
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}
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else {
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daughterRho = "rho+";
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}
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r = br;
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}
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if (fAnti) daughterN = "anti_" + daughterN;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterN, daughterRho);
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// add decay table
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decayTable->Insert(mode);
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return decayTable;
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}
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G4DecayTable* G4ExcitedDeltaConstructor::AddNStarPiMode(G4DecayTable* decayTable,
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const G4String& nameParent, G4double br,
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G4int iIso3, G4bool fAnti)
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{
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G4VDecayChannel* mode;
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G4String daughterN;
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G4String daughterPi;
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G4double r = 0.;
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// ------------ N pi0 ------------
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// determine daughters
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if ((iIso3 == +1) || (iIso3 == -1)) {
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if (iIso3 == +1) {
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daughterN = "N(1440)+";
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daughterPi = "pi0";
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r = br * 2. / 3.;
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}
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else if (iIso3 == -1) {
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daughterN = "N(1440)0";
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daughterPi = "pi0";
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r = br / 3.;
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}
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if (fAnti) daughterN = "anti_" + daughterN;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterN, daughterPi);
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// add decay table
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decayTable->Insert(mode);
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}
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// -------------N pi +/- --------------
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// determine daughters
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if (iIso3 == +3) {
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daughterN = "N(1440)+";
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if (!fAnti) {
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daughterPi = "pi+";
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}
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else {
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daughterPi = "pi-";
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}
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r = br;
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}
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else if (iIso3 == +1) {
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daughterN = "N(1440)0";
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if (!fAnti) {
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daughterPi = "pi+";
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}
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else {
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daughterPi = "pi-";
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}
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r = br / 3.;
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}
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else if (iIso3 == -1) {
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daughterN = "N(1440)+";
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if (!fAnti) {
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daughterPi = "pi-";
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}
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else {
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daughterPi = "pi+";
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}
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r = br * 2. / 3.;
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}
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else if (iIso3 == -3) {
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daughterN = "N(1440)0";
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if (!fAnti) {
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daughterPi = "pi-";
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}
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else {
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daughterPi = "pi+";
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}
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r = br;
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}
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if (fAnti) daughterN = "anti_" + daughterN;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterN, daughterPi);
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// add decay table
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decayTable->Insert(mode);
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return decayTable;
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}
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G4DecayTable* G4ExcitedDeltaConstructor::AddDeltaPiMode(G4DecayTable* decayTable,
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const G4String& nameParent, G4double br,
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G4int iIso3, G4bool fAnti)
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{
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G4VDecayChannel* mode;
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G4String daughterDelta;
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G4String daughterPi;
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G4double r;
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// ------------ Delta pi +------------
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// determine daughters
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if (iIso3 == +3) {
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daughterDelta = "delta+";
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r = br * 0.4;
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}
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else if (iIso3 == +1) {
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daughterDelta = "delta0";
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r = br * 8. / 15.0;
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}
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else if (iIso3 == -1) {
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daughterDelta = "delta-";
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r = br * 6. / 15.;
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}
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else {
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r = 0.;
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}
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if (!fAnti) {
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daughterPi = "pi+";
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}
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else {
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daughterPi = "pi-";
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}
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if (fAnti) daughterDelta = "anti_" + daughterDelta;
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if (r > 0.0) {
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterDelta, daughterPi);
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// add decay table
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decayTable->Insert(mode);
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}
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// ------------ Delta pi0 ------------
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// determine daughters
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if (iIso3 == +3) {
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daughterDelta = "delta++";
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r = br * 0.6;
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}
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else if (iIso3 == +1) {
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daughterDelta = "delta+";
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r = br * 1. / 15.0;
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}
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else if (iIso3 == -1) {
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daughterDelta = "delta0";
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r = br * 1. / 15.;
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}
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else {
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daughterDelta = "delta-";
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r = br * 0.6;
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}
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daughterPi = "pi0";
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if (fAnti) daughterDelta = "anti_" + daughterDelta;
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterDelta, daughterPi);
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// add decay table
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decayTable->Insert(mode);
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// ------------ Delta pi - -------------
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// determine daughters
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if (iIso3 == +3) {
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r = 0.;
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}
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else if (iIso3 == +1) {
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daughterDelta = "delta++";
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r = br * 6. / 15.0;
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}
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else if (iIso3 == -1) {
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daughterDelta = "delta+";
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r = br * 8. / 15.;
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}
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else {
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daughterDelta = "delta0";
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r = br * 0.4;
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}
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if (!fAnti) {
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daughterPi = "pi-";
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}
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else {
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daughterPi = "pi+";
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}
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if (fAnti) daughterDelta = "anti_" + daughterDelta;
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if (r > 0.0) {
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// create decay channel [parent BR #daughters]
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mode = new G4PhaseSpaceDecayChannel(nameParent, r, 2, daughterDelta, daughterPi);
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// add decay table
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decayTable->Insert(mode);
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}
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return decayTable;
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}
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// clang-format off
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const char* G4ExcitedDeltaConstructor::name[] =
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{
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"delta(1600)", "delta(1620)", "delta(1700)", "delta(1900)", "delta(1905)",
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"delta(1910)", "delta(1920)", "delta(1930)", "delta(1950)"
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};
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const G4double G4ExcitedDeltaConstructor::mass[] =
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{
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1.570*GeV, 1.610*GeV, 1.710*GeV, 1.860*GeV, 1.880*GeV,
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1.900*GeV, 1.920*GeV, 1.950*GeV, 1.930*GeV
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};
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const G4double G4ExcitedDeltaConstructor::width[] = {
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250.0*MeV, 130.0*MeV, 300.0*MeV, 250.0*MeV, 330.0*MeV,
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300.0*MeV, 300.0*MeV, 300.0*MeV, 285.0*MeV
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};
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const G4int G4ExcitedDeltaConstructor::iSpin[] =
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{
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3, 1, 3, 1, 5,
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1, 3, 5, 7
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};
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const G4int G4ExcitedDeltaConstructor::iParity[] = {
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+1, -1, -1, -1, +1,
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+1, +1, -1, +1
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};
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const G4int G4ExcitedDeltaConstructor::encodingOffset[] = {
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30000, 0, 10000, 10000, 0,
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20000, 20000, 10000, 0
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};
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const G4double G4ExcitedDeltaConstructor::bRatio[ G4ExcitedDeltaConstructor::NStates ][ G4ExcitedDeltaConstructor::NumberOfDecayModes] =
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{
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// NGamma Npi NRho DeltaPi N*Pi
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{ 0.0, 0.15, 0.0, 0.55, 0.30 },
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{ 0.0, 0.25, 0.0, 0.60, 0.15 },
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{ 0.0, 0.20, 0.10, 0.55, 0.15 },
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{ 0.0, 0.30, 0.15, 0.30, 0.25 },
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{ 0.0, 0.20, 0.60, 0.10, 0.10 },
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{ 0.0, 0.35, 0.40, 0.15, 0.10 },
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{ 0.0, 0.15, 0.30, 0.30, 0.25 },
|
|
{ 0.0, 0.20, 0.25, 0.25, 0.30 },
|
|
{ 0.01, 0.44, 0.15, 0.20, 0.20 }
|
|
};
|