NPQFS.cxx 31.56 KiB
/*****************************************************************************
* Copyright (C) 2009-2019 this file is part of the NPTool Project *
* *
* For the licensing terms see $NPTOOL/Licence/NPTool_Licence *
* For the list of contributors see $NPTOOL/Licence/Contributors *
*****************************************************************************/
/*****************************************************************************
* *
* Original Author : F. Flavigny contact address: flavigny@lpccaen.in2p3.fr *
* *
* Creation Date : April 2019 *
* Last update : Nov 2019 *
*---------------------------------------------------------------------------*
* Decription: *
* This class deal with Quasi Free Scattering Reaction in which a cluster *
* or a nucleon is removed from a projectile by interaction with a target *
* nucleon (proton target in general) *
* *
* First step (dissociation): A -> B + a *
* Second step (scattering) : a + T -> 1 + 2 *
* Labeling is: *
* *
* A --> T ==> B + (a -> T) => B + 1 + 2 *
* *
* where: *
* + A is the beam nucleus *
* + T is the target nucleon (proton) *
* *
* + B is the residual fragment (beam-like) *
* + 1 is the scattered target nucleon (former T) *
* + 2 is the knocked-out cluster/nucleon (noted a) in the intermediate *
*---------------------------------------------------------------------------*
* Comment: *
* + Adapted from original event generator from V. Panin (R3B collab) *
* *
*****************************************************************************/
#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <sstream>
#include <cmath>
#include <vector>
#include "NPQFS.h"
#include "NPCore.h"
#include "NPOptionManager.h"
#include "NPFunction.h"
// Use CLHEP System of unit and Physical Constant
#include "NPGlobalSystemOfUnits.h"
#include "NPPhysicalConstants.h"
#ifdef NP_SYSTEM_OF_UNITS_H
using namespace NPUNITS;
#endif
// ROOT
#include"TF1.h"
ClassImp(QFS)
////////////////////////////////////////////////////////////////////////////////
QFS::QFS(){
//------------- Default Constructor -------------
fVerboseLevel = NPOptionManager::getInstance()->GetVerboseLevel();
fBeamEnergy = 0; fThetaCM = 0;
fPhiCM = 0;
fExcitationA = 0;
fExcitationB = 0;
fMomentumSigma = 0;
fInternalMomentum = {0., 0.,0. };
fshootB=false;
fshoot1=true;
fshoot2=true;
fIsotropic = true;
fCondEcmPos = false;
fCondOffshellMassPos = false;
fIsAllowed = false;
fUseExInGeant4=true;
fTheta2VsTheta1 = 0;
fPhi2VsPhi1 = 0;
fPerpMomentumHist = NULL;
fParMomentumHist = NULL;
fDeexcitation = false;
}
////////////////////////////////////////////////////////////////////////////////
QFS::~QFS(){
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
void QFS::ReadConfigurationFile(string Path){
ifstream ReactionFile;
string GlobalPath = getenv("NPTOOL");
string StandardPath = GlobalPath + "/Inputs/EventGenerator/" + Path;
ReactionFile.open(Path.c_str());
if (!ReactionFile.is_open()) {
ReactionFile.open(StandardPath.c_str());
if(ReactionFile.is_open()) {
Path = StandardPath;
}
else {cout << "QFS File " << Path << " not found" << endl;exit(1);}
}
NPL::InputParser parser(Path);
ReadConfigurationFile(parser);
}
////////////////////////////////////////////////////////////////////////////////
void QFS::ReadConfigurationFile(NPL::InputParser parser){
cout << " In QFS ReadConfiguration " << endl;
vector<NPL::InputBlock*> blocks = parser.GetAllBlocksWithToken("QFSReaction");
if(blocks.size()>0 && NPOptionManager::getInstance()->GetVerboseLevel())
cout << endl << "\033[1;35m//// QFS reaction found " << endl;
vector<string> token1 = {"Beam","Target","Scattered","KnockedOut","Heavy"};
for(unsigned int i = 0 ; i < blocks.size() ; i++){
if(blocks[i]->HasTokenList(token1)){
int v = NPOptionManager::getInstance()->GetVerboseLevel();
NPOptionManager::getInstance()->SetVerboseLevel(0);
fParticleA.ReadConfigurationFile(parser);
NPOptionManager::getInstance()->SetVerboseLevel(v);
fBeamEnergy= fParticleA.GetEnergy();
GetParticle(blocks[i]->GetString("Beam"),parser);
fParticleT = GetParticle(blocks[i]->GetString("Target"),parser); fParticleB = GetParticle(blocks[i]->GetString("Heavy"),parser);
fParticle1 = GetParticle(blocks[i]->GetString("Scattered"),parser);
fParticle2 = GetParticle(blocks[i]->GetString("KnockedOut"),parser);
}
else{
cout << "ERROR: check your input file formatting \033[0m" << endl;
exit(1);
}
if(blocks[i]->HasToken("ExcitationEnergyBeam")){
fExcitationA = blocks[i]->GetDouble("ExcitationEnergyBeam","MeV");
}
if(blocks[i]->HasToken("ExcitationEnergyHeavy")){
fExcitationB = blocks[i]->GetDouble("ExcitationEnergyHeavy","MeV");
}
if(blocks[i]->HasToken("MomentumSigma")){
fMomentumSigma = blocks[i]->GetDouble("MomentumSigma","MeV");
}
if(blocks[i]->HasToken("ShootHeavy")){
fshootB = blocks[i]->GetInt("ShootHeavy");
}
if(blocks[i]->HasToken("ShootLight")){
fshoot1 = blocks[i]->GetInt("ShootLight");
fshoot2 = blocks[i]->GetInt("ShootLight");
}
if(blocks[i]->HasToken("ShootLight1")){
fshoot1 = blocks[i]->GetInt("ShootLight1");
}
if(blocks[i]->HasToken("ShootLight2")){
fshoot2 = blocks[i]->GetInt("ShootLight2");
}
if(blocks[i]->HasToken("PerpMomentumPath")){
vector<string> file_perp = blocks[i]->GetVectorString("PerpMomentumPath");
TH1F* Perptemp = Read1DProfile(file_perp[0], file_perp[1]);
SetPerpMomentumHist(Perptemp);
}
if(blocks[i]->HasToken("ParMomentumPath")){
vector<string> file_par = blocks[i]->GetVectorString("ParMomentumPath");
TH1F* Partemp = Read1DProfile(file_par[0], file_par[1]);
SetParMomentumHist(Partemp);
}
if(blocks[i]->HasToken("Deexcitation")){
fDeexcitation = blocks[i]->GetInt("Deexcitation");
}
}
cout << "\033[0m" ;
}
////////////////////////////////////////////////////////////////////////////////
Particle QFS::GetParticle(string name, NPL::InputParser parser){
vector<NPL::InputBlock*> blocks = parser.GetAllBlocksWithTokenAndValue("DefineParticle",name);
unsigned int size = blocks.size();
if(size==0)
return NPL::Particle(name);
else if(size==1){
cout << " -- User defined nucleus " << name << " -- " << endl;
vector<string> token = {"SubPart","BindingEnergy"};
if(blocks[0]->HasTokenList(token)){
NPL::Particle N(name,blocks[0]->GetVectorString("SubPart"),blocks[0]->GetDouble("BindingEnergy","MeV"));
if(blocks[0]->HasToken("ExcitationEnergy"))
N.SetExcitationEnergy(blocks[0]->GetDouble("ExcitationEnergy","MeV"));
if(blocks[0]->HasToken("SpinParity"))
N.SetSpinParity(blocks[0]->GetString("SpinParity").c_str());
if(blocks[0]->HasToken("Spin"))
N.SetSpin(blocks[0]->GetDouble("Spin",""));
if(blocks[0]->HasToken("Parity"))
N.SetParity(blocks[0]->GetString("Parity").c_str());
if(blocks[0]->HasToken("LifeTime"))
N.SetLifeTime(blocks[0]->GetDouble("LifeTime","s"));
cout << " -- -- -- -- -- -- -- -- -- -- --" << endl;
return N;
}
}
else{
NPL::SendErrorAndExit("NPL::QFS","Too many nuclei define with the same name");
return NPL::Particle();
}
return NPL::Particle();
}
////////////////////////////////////////////////////////////////////////////////////////////
void QFS::CalculateVariables(){
fCondEcmPos = false;
fCondOffshellMassPos = false;
if(fBeamEnergy < 0)
fBeamEnergy = 0 ;
//cout<<"---- COMPUTE ------"<<endl;
// cout<<"--CM--"<<endl;
mA = fParticleA.Mass(); // Beam mass in MeV
mT = fParticleT.Mass(); // Target mass in MeV
fParticleB.SetExcitationEnergy(fExcitationB);
mB = fParticleB.Mass(); // Heavy residual mass in MeV
m1 = mT; // scattered target nucleon (same mass);
m2 = fParticle2.Mass(); // knocked out cluster mass in MeV
ma = m2; // intermediate cluster mass in MeV (same);
double TA = fBeamEnergy; // Beam kinetic energy
double PA = sqrt(TA*(TA+2*mA)); // Beam momentum (norm)
double EA = sqrt(mA*mA + PA*PA); // Beam total energy
fEnergyImpulsionLab_A = TLorentzVector(0.,0.,PA,EA);
// Internal momentum of removed cluster/nucleon (Pa) and recoil (PB)
// here fInternalMomentum contains PB (recoil fragment momentum)
// readout from the input file (theoretical)
PB.SetX(fInternalMomentum.X());
PB.SetY(fInternalMomentum.Y());
PB.SetZ(fInternalMomentum.Z());
Pa.SetXYZ( (-PB.X()) , (-PB.Y()) , (-PB.Z()) );
// Off-shell mass of the bound nucleon from E conservation
// in virtual dissociation of A -> B + a
double buffer = mA*mA + mB*mB - 2*mA*sqrt(mB*mB+Pa.Mag2()) ;
if(buffer>0) {fCondOffshellMassPos = true;}
else{/*cout<<"ERROR off shell mass ma_off=\t"<<buffer<<endl; Dump();*/ return;}
ma_off = sqrt(buffer);
//deduced total energies of "a" and "B" in restframe of A
double Ea = sqrt(ma_off*ma_off + Pa.Mag2());
double EB = sqrt(mB*mB + PB.Mag2());
fEnergyImpulsionCM_a = TLorentzVector(Pa,Ea);
fEnergyImpulsionCM_B = TLorentzVector(PB,EB);
fEnergyImpulsionLab_a = TLorentzVector(Pa,Ea);
fEnergyImpulsionLab_B = TLorentzVector(PB,EB);
fEnergyImpulsionLab_a.Boost(0,0,fEnergyImpulsionLab_A.Beta());
fEnergyImpulsionLab_B.Boost(0,0,fEnergyImpulsionLab_A.Beta());
Ea_lab = fEnergyImpulsionLab_a.E();
EB_lab = fEnergyImpulsionLab_B.E();
Pa_lab = fEnergyImpulsionLab_a.Vect();
PB_lab = fEnergyImpulsionLab_B.Vect();
// Scattering part (2-body kinematics) // virtual cluster of mass "ma_off" scattering on target T
// to give scattered cluster with real mass (ma=m2)
// and scattered target (mT=m1)
fQValue =ma_off+mT-m1-m2;
s = ma_off*ma_off + mT*mT + 2*mT*Ea_lab ;
fTotalEnergyImpulsionCM = TLorentzVector(0,0,0,sqrt(s));
fEcm = sqrt(s) - m1 -m2;
if(fEcm>0) {fCondEcmPos = true;}
if(fEcm<=0) { /*cout<<"ERROR Ecm negative =\t"<<fEcm<<endl;Dump();*/ return;}
ECM_a = (s + ma_off*ma_off - mT*mT)/(2*sqrt(s));
ECM_T = (s + mT*mT - ma_off*ma_off)/(2*sqrt(s));
ECM_1 = (s + m1*m1 - m2*m2)/(2*sqrt(s));
ECM_2 = (s + m2*m2 - m1*m1)/(2*sqrt(s));
pCM_a = sqrt(ECM_a*ECM_a - ma_off*ma_off);
pCM_T = sqrt(ECM_T*ECM_T - mT*mT);
pCM_1 = sqrt(ECM_1*ECM_1 - m1*m1);
pCM_2 = sqrt(ECM_2*ECM_2 - m2*m2);
}
////////////////////////////////////////////////////////////////////////////////////////////
void QFS::KineRelativistic(double& ThetaLab1, double& PhiLab1, double& KineticEnergyLab1, double& ThetaLab2, double& PhiLab2, double& KineticEnergyLab2){
fIsAllowed=false;
CalculateVariables();
if(fCondOffshellMassPos && fCondEcmPos) fIsAllowed= true;
else return;
double thetaCM_1 = fThetaCM;
double thetaCM_2 = M_PI - thetaCM_1;
double phiCM_2 = fPhiCM;
TVector3 z_axis(0.,0.,1.);
/* // OTHER WAY of doing
TVector3 pCM_2_temp(0.,0.,1.);
pCM_2_temp.SetMag(pCM_2);
pCM_2_temp.SetTheta(thetaCM_2);
pCM_2_temp.SetPhi(phiCM_2);
fEnergyImpulsionCM_2 = TLorentzVector(pCM_2_temp,ECM_2);
fEnergyImpulsionCM_1 = TLorentzVector(-1*pCM_2_temp,ECM_1);
*/
fEnergyImpulsionCM_2 = TLorentzVector(
pCM_2*sin(thetaCM_2)*cos(phiCM_2),
pCM_2*sin(thetaCM_2)*sin(phiCM_2),
pCM_2*cos(thetaCM_2),
ECM_2);
fEnergyImpulsionCM_1 = fTotalEnergyImpulsionCM - fEnergyImpulsionCM_2;
//-- Boost in the direction of the moving cluster "a" --//
BetaCM = Pa_lab.Mag() / (Ea_lab + mT);
fEnergyImpulsionLab_1 = fEnergyImpulsionCM_1;
fEnergyImpulsionLab_1.Boost(0,0,BetaCM);
fEnergyImpulsionLab_2 = fEnergyImpulsionCM_2;
fEnergyImpulsionLab_2.Boost(0,0,BetaCM);
//-- Rotation to go from cluster frame to beam frame --//
TVector3 direction = Pa_lab.Unit();
fEnergyImpulsionLab_1.RotateUz(direction);
fEnergyImpulsionLab_2.RotateUz(direction);
/*
// Angle in the Lab frame
ThetaLab1 = fEnergyImpulsionLab_1.Angle(fEnergyImpulsionLab_A.Vect()); //ThetaLab1 = fEnergyImpulsionLab_1.Angle(z_axis);
if (ThetaLab1 < 0) ThetaLab1 += M_PI;
ThetaLab2 = fEnergyImpulsionLab_2.Angle(fEnergyImpulsionLab_A.Vect());
//ThetaLab2 = fEnergyImpulsionLab_2.Angle(z_axis);
if (fabs(ThetaLab1) < 1e-6) ThetaLab1 = 0;
ThetaLab2 = fabs(ThetaLab2);
if (fabs(ThetaLab2) < 1e-6) ThetaLab2 = 0;
PhiLab1 = M_PI + fEnergyImpulsionLab_1.Vect().Phi();
if (fabs(PhiLab1) < 1e-6) PhiLab1 = 0;
PhiLab2 = M_PI + fEnergyImpulsionLab_2.Vect().Phi();
if (fabs(PhiLab2) < 1e-6) PhiLab2 = 0;
*/
ThetaLab1 = fEnergyImpulsionLab_1.Angle(fEnergyImpulsionLab_A.Vect());
ThetaLab2 = fEnergyImpulsionLab_2.Angle(fEnergyImpulsionLab_A.Vect());
PhiLab1 = fEnergyImpulsionLab_1.Vect().Phi();
PhiLab2 = fEnergyImpulsionLab_2.Vect().Phi();
// Kinetic Energy in the lab frame
KineticEnergyLab1 = fEnergyImpulsionLab_1.E() - m1;
KineticEnergyLab2 = fEnergyImpulsionLab_2.E() - m2;
// test for total energy conversion
//if (fabs(fTotalEnergyImpulsionLab.E() - (fEnergyImpulsionLab_1.E()+fEnergyImpulsionLab_2.E())) > 1e-6)
// cout << "Problem for energy conservation" << endl;
//Dump();
}
////////////////////////////////////////////////////////////////////////////////////////////
void QFS::Dump(){
cout<<endl;
cout<<"------------------------------------"<<endl;
cout<<"------------ DUMP QFS --------------"<<endl;
cout<<"------------------------------------"<<endl;
cout<<endl;
cout<<"Cluster/recoil momentum (in the beam nucleus frame):"<<endl;
cout<<"Pa=\t("<<Pa.Px()<<","<<Pa.Py()<<","<<Pa.Pz()<<") MeV/c"<<endl;
cout<<"PB=\t("<<PB.Px()<<","<<PB.Py()<<","<<PB.Pz()<<") MeV/c"<<endl;
cout<<endl;
cout<<"Off-shell mass of the bound nucleon from E conservation "<<endl;
cout<<" in virtual dissociation of A -> B + a"<<endl;
cout<<"ma=\t"<<ma<<endl;
cout<<"ma_off=\t"<<ma_off<<endl;
cout<<"mB=\t"<<mB<<endl;
cout<<"Deduced total energies of a and B in restframe of A"<<endl;
cout<<"Ea=\t"<<fEnergyImpulsionCM_a.E()<<"\tMeV"<<endl;
cout<<"EB=\t"<<fEnergyImpulsionCM_B.E()<<"\tMeV"<<endl;
cout<<endl;
cout<<"-- Boosted in lab frame with beam on Z axis --"<<endl;
cout<<"Beta_z=\t"<<fEnergyImpulsionLab_A.Beta()<<endl;
cout<<"Pa_lab=\t("<<Pa_lab.Px()<<","<<Pa_lab.Py()<<","<<Pa_lab.Pz()<<") MeV/c"<<endl;
cout<<"PB_lab=\t("<<PB_lab.Px()<<","<<PB_lab.Py()<<","<<PB_lab.Pz()<<") MeV/c"<<endl;
cout<<"Ea_lab=\t"<<Ea_lab<<"\tMeV"<<endl;
cout<<"EB_lab=\t"<<EB_lab<<"\tMeV"<<endl;
cout<<endl;
cout<<"-- Scattering off virtual cluster a of virtual mass --"<<endl;
cout<<"-- ma_off and energy Ea_lab on target T at rest ------"<<endl;
cout<<"fQValue=\t"<<fQValue<<endl;
cout<<"s=\t"<<s<<endl;
cout<<"Ecm=\t"<<fEcm<<endl;
cout<<"ea*=\t"<<ECM_a<<endl;
cout<<"pa*=\t"<<pCM_a<<endl;
cout<<"eT*=\t"<<ECM_T<<endl;
cout<<"pT*=\t"<<pCM_T<<endl;
cout<<"e1*=\t"<<ECM_1<<endl;
cout<<"p1*=\t"<<pCM_1<<endl;
cout<<"e2*=\t"<<ECM_2<<endl; cout<<"p2*=\t"<<pCM_2<<endl;
cout<<"beta_cm=\t"<<BetaCM<<endl;
cout<<endl;
cout<<"-- Emitted Particles --"<<endl;
cout<<"Theta_cm:"<<fThetaCM*180./TMath::Pi()<<endl;
cout<<"Phi_cm:"<<fPhiCM*180./TMath::Pi()<<endl;
cout<<"P1_CM=\t("<<fEnergyImpulsionCM_1.Px()<<","<<fEnergyImpulsionCM_1.Py()<<","<<fEnergyImpulsionCM_1.Pz()<<")"<<endl;
cout<<"P2_CM=\t("<<fEnergyImpulsionCM_2.Px()<<","<<fEnergyImpulsionCM_2.Py()<<","<<fEnergyImpulsionCM_2.Pz()<<")"<<endl;
cout<<"E1_lab=\t"<<fEnergyImpulsionLab_1.E()<<endl;
cout<<"E2_lab=\t"<<fEnergyImpulsionLab_2.E()<<endl;
cout<<"P1_lab=\t("<<fEnergyImpulsionLab_1.Px()<<","<<fEnergyImpulsionLab_1.Py()<<","<<fEnergyImpulsionLab_1.Pz()<<")"<<endl;
cout<<"P2_lab=\t("<<fEnergyImpulsionLab_2.Px()<<","<<fEnergyImpulsionLab_2.Py()<<","<<fEnergyImpulsionLab_2.Pz()<<")"<<endl;
cout<<"Theta1:\t"<<fEnergyImpulsionLab_1.Vect().Theta()*180./TMath::Pi()<<endl;
cout<<"Theta2:\t"<<fEnergyImpulsionLab_2.Vect().Theta()*180./TMath::Pi()<<endl;
cout<<"Phi1:\t"<<fEnergyImpulsionLab_1.Vect().Phi()*180./TMath::Pi()<<endl;
cout<<"Phi2:\t"<<fEnergyImpulsionLab_2.Vect().Phi()*180./TMath::Pi()<<endl;
}
////////////////////////////////////////////////////////////////////////////////////////////
TVector3 QFS::ShootInternalMomentum(){
//Shoot a momentum (vector) for the internal cluster in the beam-at-rest frame
// (1) if only a width is provided: shoot in 3 independant Gaussian
// (2) if input histos are provided: use them instead of option (1)
// Remark : if both width and input histos are provided only histos are considered
TVector3 momentum = {0,0,0};
double PerpMomentum =0;
double ParMomentum =0;
double angle_tmp =0;
momentum.SetX(gRandom->Gaus(0.,fMomentumSigma));
momentum.SetY(gRandom->Gaus(0.,fMomentumSigma));
momentum.SetZ(gRandom->Gaus(0.,fMomentumSigma));
if(fPerpMomentumHist){
PerpMomentum=fPerpMomentumHist->GetRandom();
angle_tmp = gRandom->Rndm()*2*M_PI;
momentum.SetX(PerpMomentum * TMath::Cos(angle_tmp));
momentum.SetY(PerpMomentum * TMath::Sin(angle_tmp));
}
if(fParMomentumHist){
ParMomentum=fParMomentumHist->GetRandom();
momentum.SetZ(ParMomentum);
}
//cout << " Shooting Random Momentum: " << endl;
//cout<<"Px:"<<momentum.X() << endl;
//cout<<"Py:"<<momentum.Y() << endl;
//cout<<"Pz:"<<momentum.Z() << endl;
SetInternalMomentum(momentum);
return momentum;
}
////////////////////////////////////////////////////////////////////////////////////////////
TGraph* QFS::GetTheta2VsTheta1(double AngleStep_CM){
vector<double> vx;
vector<double> vy;
double theta1,phi1,E1,theta2,phi2,E2;
SetPhiCM(0.*TMath::Pi()/180.);
for (double angle=0 ; angle <= 180 ; angle+=AngleStep_CM){
SetThetaCM(angle*TMath::Pi()/180.);
KineRelativistic(theta1, phi1, E1, theta2, phi2, E2);
vx.push_back(theta1*180./M_PI);
vy.push_back(theta2*180./M_PI);
} fTheta2VsTheta1 = new TGraph(vx.size(),&vx[0],&vy[0]);
return(fTheta2VsTheta1);
}
////////////////////////////////////////////////////////////////////////////////////////////
TGraph* QFS::GetPhi2VsPhi1(double AngleStep_CM){
vector<double> vx;
vector<double> vy;
double theta1,phi1,E1,theta2,phi2,E2;
SetThetaCM(0.*TMath::Pi()/180.);
for (double angle=-180 ; angle <= 180 ; angle+=AngleStep_CM){
SetPhiCM(angle*TMath::Pi()/180.);
KineRelativistic(theta1, phi1, E1, theta2, phi2, E2);
vx.push_back(phi1*180./M_PI);
vy.push_back(phi2*180./M_PI);
}
fPhi2VsPhi1 = new TGraph(vx.size(),&vx[0],&vy[0]);
return(fPhi2VsPhi1);
}
////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////
///////////////// Old R3B method not using TLorentz Vector ////////////////////////////////
/////////////////// (used as a reference)///////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////
void QFS::TestR3B()
{
CalculateVariablesOld();
}
void QFS::CalculateVariablesOld(){
if(fBeamEnergy < 0)
fBeamEnergy = 0 ;
//cout<<"---- COMPUTE ------"<<endl;
// cout<<"--CM--"<<endl;
mA = fParticleA.Mass(); // Beam mass in MeV
mT = fParticleT.Mass(); // Target mass in MeV
fParticleB.SetExcitationEnergy(fExcitationB);
mB = fParticleB.Mass(); // Heavy residual mass in MeV
m1 = mT; // scattered target nucleon (same mass);
m2 = fParticle2.Mass(); // knocked out cluster mass in MeV
ma = m2; // intermediate cluster mass in MeV (same);
double TA = fBeamEnergy; // Beam kinetic energy
double PA = sqrt(TA*(TA+2*mA)); // Beam momentum (norm)
double EA = sqrt(mA*mA + PA*PA); // Beam total energy
fEnergyImpulsionLab_A = TLorentzVector(0.,0.,PA,EA);
//Internal momentum of removed cluster/nucleon
//gRandom->SetSeed(0);
//double mom_sigma = 0; // MeV/c
//Pa.SetX(gRandom->Gaus(0.,fMomentumSigma));
//Pa.SetY(gRandom->Gaus(0.,fMomentumSigma));
//Pa.SetZ(gRandom->Gaus(0.,fMomentumSigma));
Pa.SetX(50);
Pa.SetY(50);
Pa.SetZ(50);
//Internal momentum of heavy recoil after removal PB.SetXYZ( (-Pa.X()) , (-Pa.Y()) , (-Pa.Z()) );
// Off-shell mass of the bound nucleon from E conservation
// in virtual dissociation of A -> B + a
double buffer = mA*mA + mB*mB - 2*mA*sqrt(mB*mB+Pa.Mag2()) ;
if(buffer<=0) { cout<<"ERROR off shell mass ma_off=\t"<<buffer<<endl; return;}
ma_off = sqrt(buffer);
//deduced total energies of "a" and "B" in restframe of A
double Ea = sqrt(ma_off*ma_off + Pa.Mag2());
double EB = sqrt(mB*mB + PB.Mag2());
fEnergyImpulsionCM_a = TLorentzVector(Pa,Ea);
fEnergyImpulsionCM_B = TLorentzVector(PB,EB);
fEnergyImpulsionLab_a = TLorentzVector(Pa,Ea);
fEnergyImpulsionLab_B = TLorentzVector(PB,EB);
fEnergyImpulsionLab_a.Boost(0,0,fEnergyImpulsionLab_A.Beta());
fEnergyImpulsionLab_B.Boost(0,0,fEnergyImpulsionLab_A.Beta());
Ea_lab = fEnergyImpulsionLab_a.E();
EB_lab = fEnergyImpulsionLab_B.E();
Pa_lab = fEnergyImpulsionLab_a.Vect();
PB_lab = fEnergyImpulsionLab_B.Vect();
// Scattering part (2-body kinematics)
// virtual cluster of mass "ma_off" scattering on target T
// to give scattered cluster with real mass (ma=m2)
// and scattered target (mT=m1)
fQValue =ma_off+mT-m1-m2;
s = ma_off*ma_off + mT*mT + 2*mT*Ea_lab ;
fTotalEnergyImpulsionCM = TLorentzVector(0,0,0,sqrt(s));
fEcm = sqrt(s) - m1 -m2;
if(fEcm<=0) { cout<<"ERROR Ecm negative =\t"<<fEcm<<endl;Dump(); return;}
vector<double> theta1;
vector<double> theta2;
vector<double> phi1;
vector<double> phi2;
//for(int i=0; i<=180; i++){
int i = 30;
KineR3B(s, ma_off, mT, ma, (double)i);
if(!good) { cout<<"ERROR CM calculations!!!"<<endl; return;}
cout<<endl;
cout<<"------------------------------------"<<endl;
cout<<"------------ DUMP R3B --------------"<<endl;
cout<<"------------------------------------"<<endl;
cout<<endl;
cout<<"Cluster/recoil momentum (in the beam nucleus frame):"<<endl;
cout<<"Pa=\t("<<Pa.Px()<<","<<Pa.Py()<<","<<Pa.Pz()<<") MeV/c"<<endl;
cout<<"PB=\t("<<PB.Px()<<","<<PB.Py()<<","<<PB.Pz()<<") MeV/c"<<endl;
cout<<endl;
cout<<"Off-shell mass of the bound nucleon from E conservation "<<endl;
cout<<" in virtual dissociation of A -> B + a"<<endl;
cout<<"ma=\t"<<ma<<endl;
cout<<"ma_off=\t"<<ma_off<<endl;
cout<<"mB=\t"<<mB<<endl;
cout<<"Deduced total energies of a and B in restframe of A"<<endl;
cout<<"Ea=\t"<<fEnergyImpulsionCM_a.E()<<"\tMeV"<<endl;
cout<<"EB=\t"<<fEnergyImpulsionCM_B.E()<<"\tMeV"<<endl;
cout<<endl;
cout<<"-- Boosted in lab frame with beam on Z axis --"<<endl;
cout<<"Beta_z=\t"<<fEnergyImpulsionLab_A.Beta()<<endl;
cout<<"Pa_lab=\t("<<Pa_lab.Px()<<","<<Pa_lab.Py()<<","<<Pa_lab.Pz()<<") MeV/c"<<endl;
cout<<"PB_lab=\t("<<PB_lab.Px()<<","<<PB_lab.Py()<<","<<PB_lab.Pz()<<") MeV/c"<<endl;
cout<<"Ea_lab=\t"<<Ea_lab<<"\tMeV"<<endl; cout<<"EB_lab=\t"<<EB_lab<<"\tMeV"<<endl;
cout<<endl;
cout<<"-- Scattering off virtual cluster a of virtual mass --"<<endl;
cout<<"-- ma_off and energy Ea_lab on target T at rest ------"<<endl;
cout<<"fQValue=\t"<<fQValue<<endl;
cout<<"s=\t"<<s<<endl;
cout<<"Ecm=\t"<<fEcm<<endl;
cout<<endl;
TVector3 P1_cm(0.,0.,1.), P2_cm(0.,0.,1.);
P2_cm.SetMag(p_clust);
P2_cm.SetTheta(theta_clust);
//TRandom3 ra;
//ra.SetSeed(0);
//P2_cm.SetPhi(ra.Uniform(-1*TMath::Pi(),+1*TMath::Pi()));
P2_cm.SetPhi(20.*TMath::Pi()/180.);
P1_cm.SetX(-P2_cm.X());
P1_cm.SetY(-P2_cm.Y());
P1_cm.SetZ(-P2_cm.Z());
cout<<"P1_CM=\t("<<P1_cm.X()<<","<<P1_cm.Y()<<","<<P1_cm.Z()<<")"<<endl;
cout<<"P2_CM=\t("<<P2_cm.X()<<","<<P2_cm.Y()<<","<<P2_cm.Z()<<")"<<endl;
// Calculate relative to direction of quasi-particle (cluster)
double beta_cm = -Pa_lab.Mag() / (Ea_lab + mT);
double gamma_cm = 1/sqrt(1-beta_cm*beta_cm);
pair<double,double> lor_a1 = Lorentz(gamma_cm,beta_cm,e_scat,P1_cm.Z());
pair<double,double> lor_a2 = Lorentz(gamma_cm,beta_cm,e_clust,P2_cm.Z());
P1_cm.SetZ(lor_a1.second);
P2_cm.SetZ(lor_a2.second);
//Rotating back to beam direction
TVector3 P1_L = Rotations(P1_cm, Pa_lab);
TVector3 P2_L = Rotations(P2_cm, Pa_lab);
//TVector3 P1_L = P1_cm;
//TVector3 P2_L = P2_cm;
//TVector3 direction = Pa.Unit();
//P1_L.RotateUz(direction);
//P1_L.RotateUz(direction);
cout<<"----Calculate variables output------"<<endl;
cout<<"--CM--"<<endl;
cout<<"theta1*=\t"<<theta_scat*180/TMath::Pi()<<endl;
cout<<"theta2*=\t"<<theta_clust*180/TMath::Pi()<<endl;
cout<<"e1*=\t"<<e_scat<<endl;
cout<<"p1*=\t"<<p_scat<<endl;
cout<<"e2*=\t"<<e_clust<<endl;
cout<<"p2*=\t"<<p_clust<<endl;
cout<<"T=\t"<<T<<endl;
cout<<"beta_cm=\t"<<beta_cm<<endl;
cout<<"gamma_cm=\t"<<gamma_cm<<endl;
cout<<"--LAB (cluster dir)--"<<endl;
cout<<"P1_lab=\t("<<P1_cm.X()<<","<<P1_cm.Y()<<","<<P1_cm.Z()<<")"<<endl;
cout<<"P2_lab=\t("<<P2_cm.X()<<","<<P2_cm.Y()<<","<<P2_cm.Z()<<")"<<endl;
cout<<"Theta1:\t"<<P1_cm.Theta()*180./TMath::Pi()<<endl;
cout<<"Theta2:\t"<<P2_cm.Theta()*180./TMath::Pi()<<endl;
cout<<"--LAB--"<<endl;
cout<<"Pa_lab=\t("<<Pa_lab.X()<<","<<Pa_lab.Y()<<","<<Pa_lab.Z()<<")"<<endl;
cout<<"P1_L=\t("<<P1_L.X()<<","<<P1_L.Y()<<","<<P1_L.Z()<<")"<<endl;
cout<<"P2_L=\t("<<P2_L.X()<<","<<P2_L.Y()<<","<<P2_L.Z()<<")"<<endl;
cout<<"Theta1L:\t"<<P1_L.Theta()*180./TMath::Pi()<<endl;
cout<<"Theta2L:\t"<<P2_L.Theta()*180./TMath::Pi()<<endl;
cout<<"Phi1L:\t"<<P1_L.Phi()*180./TMath::Pi()<<endl; cout<<"Phi2L:\t"<<P2_L.Phi()*180./TMath::Pi()<<endl;
//cout<<P1_cm.Theta()*180./TMath::Pi()<<"\t"<<P2_cm.Theta()*180./TMath::Pi()<<endl;
//cout<<P1_L.Phi()*180./TMath::Pi()<<"\t"<<P2_L.Phi()*180./TMath::Pi()<<endl;
theta1.push_back(P1_L.Theta()*180./TMath::Pi());
theta2.push_back(P2_L.Theta()*180./TMath::Pi());
double temp_phi1 = P1_L.Phi();
double temp_phi2 = P2_L.Phi();
phi1.push_back(180. + P1_L.Phi()*180./TMath::Pi());
phi2.push_back(180. + P2_L.Phi()*180./TMath::Pi());
//}
TGraph* fTheta2VsTheta1 = new TGraph(theta1.size(),&theta1[0],&theta2[0]);
TGraph* fPhi2VsPhi1 = new TGraph(phi1.size(),&phi1[0],&phi2[0]);
fTheta2VsTheta1->SetName("Theta2VsTheta1");
fPhi2VsPhi1->SetName("Phi2VsPhi1");
TFile* f = new TFile("graphs.root","RECREATE");
fTheta2VsTheta1->Write();
fPhi2VsPhi1->Write();
f->Close();
}
// Calculate elastic scattering kinematics in CM-system (1-target proton, 2-cluster)
void QFS::KineR3B(double s,double m2off,double m1,double m2,double thetacm)
{
if(thetacm>180 || thetacm<0){
cout << "\nERROR! ThetaCM (in deg) should be between 0 and 180"<<endl;
return;
}
e_clust = 0;
p_clust = 0;
theta_clust = 0;
e_scat = 0;
p_scat = 0;
theta_scat = 0;
T = 0;
good = false;
double X = s;
double Y = m2off*m2off;
double Z = m1*m1;
double sqrt_s = sqrt(s);
// Kinematics before the scattering process
// (with one off-shell mass)
double p2_off = sqrt(function(X,Y,Z))/2/sqrt_s;
double p1_off = p2_off;
// CM energies
double e1_off = (s+Z-Y)/2/sqrt_s;
double e2_off = (s+Y-Z)/2/sqrt_s;
// Now take the real masses (after scattering)
Y = m2*m2; Z = m1*m1;
//And check whether the kinematical function is ok
//for this specific kinematical case
double ERROR_CI = function(X,Y,Z);
if(ERROR_CI <= 0.){
cout << "\nERROR!!! Kinematical function is negative!";
return;
}
// Kinematics after the scattering process
// (with all real masses) double p2 = sqrt(function(X,Y,Z))/2/sqrt_s;
double p1 = p2;
double e1 = (s+Z-Y)/2/sqrt_s;
double e2 = (s+Y-Z)/2/sqrt_s;
// Let's consider momentum transfer <t> from the
// target particle 1 to the cluster 2
double t = 2*(m1*m1 - e1_off*e1 + p1_off*p1*cos(thetacm*TMath::Pi()/180.));
//CM scattering angles
double theta1 = thetacm*TMath::Pi()/180.;
double theta2 = TMath::Pi() - theta1;
e_clust = e2;
p_clust = p2;
theta_clust = theta2;
e_scat = e1;
p_scat = p1;
theta_scat = theta1;
T = t;
good = true;
}
double QFS::function(double x,double y,double z)
{
double lambda = x*x + y*y + z*z - 2*x*y - 2*x*z - 2*y*z;
return lambda;
}
//---- Two consecutive rotations
//first around Z on <phi>, then around new X' on <theta> (1=Pcm, 2=Pa in lab)
TVector3 QFS::Rotations(TVector3 v1,TVector3 v2)
{
double CT = v2.Z()/v2.Mag(); // cos(theta) of v2 wrt. Z-axis
double ST = sqrt(1-CT*CT); // sin(theta)
double CF = v2.X()/v2.Mag()/ST;
double SF = v2.Y()/v2.Mag()/ST;
TVector3 v3;
double _v3x = v1.X()*CT*CF - v1.Y()*SF + v1.Z()*ST*CF;
double _v3y = v1.X()*CT*SF + v1.Y()*CF + v1.Z()*ST*SF;
double _v3z = -v1.X()*ST + v1.Z()*CT;
v3.SetXYZ(_v3x,_v3y,_v3z);
cout<<"--- ROTATION---"<<endl;
cout<<"CT=\t"<<CT<<endl;
cout<<"ST=\t"<<ST<<endl;
cout<<"CF=\t"<<CF<<endl;
cout<<"SF=\t"<<SF<<endl;
cout<<"v3x=\t"<<_v3x<<endl;
cout<<"v3y=\t"<<_v3y<<endl;
cout<<"v3z=\t"<<_v3z<<endl;
return v3;
}
pair<double, double> QFS::Lorentz(double gamma,double beta,double e,double p)
{
double eL = gamma*e - gamma*beta*p;
double pL = gamma*p - gamma*beta*e;
return make_pair(eL, pL);
}