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Modified for isotropic Mu in TF.

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nemu
2012-10-16 18:04:07 +00:00
parent e9e6c9b2e3
commit 8f057d9967
3 changed files with 69 additions and 30 deletions
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52
src/tests/MuTransition/PSimulateMuTransition.cpp
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@ -18,8 +18,8 @@
(analogous to MuBC in Si, B||(100)), a non-precessing signal, and two precessing
states ("nu_12" and "nu_34").
Parameters:
1) Precession frequencies of "nu_12" and "nu_34"
2) fractions of nu_12, nu_34
1) Precession frequencies of "nu_12", "nu_34", "nu_23", "nu_14"
2) fractions of nu_12, nu_34; and nu_23 and nu_14
3) total Mu0 fraction
4) electron-capture rate
5) Mu ionization rate
@ -91,8 +91,10 @@ PSimulateMuTransition::PSimulateMuTransition(UInt_t seed)
}
fNmuons = 100; // number of muons to simulate
fMuPrecFreq1 = 4463.; // vacuum Mu hyperfine coupling constant
fMuPrecFreq2 = 0.; // Mu precession frequency of a 2nd Mu transition
fMuPrecFreq34 = 4463.; // vacuum Mu hyperfine coupling constant
fMuPrecFreq12 = 0.; // Mu precession frequency of a 12 transition
fMuPrecFreq23 = 0.; // Mu precession frequency of a 23 transition
fMuPrecFreq14 = 0.; // Mu precession frequency of a 14 transition
fBfield = 0.01; // magnetic field (T)
fCaptureRate = 0.01; // Mu+ capture rate (MHz)
fIonizationRate = 10.; // Mu0 ionization rate (MHz)
@ -128,8 +130,10 @@ PSimulateMuTransition::~PSimulateMuTransition()
*/
void PSimulateMuTransition::PrintSettings() const
{
cout << endl << "Mu precession frequency state1 (MHz) = " << fMuPrecFreq1;
cout << endl << "Mu precession frequency state2 (MHz) = " << fMuPrecFreq2;
cout << endl << "Mu precession frequency 12 (MHz) = " << fMuPrecFreq12;
cout << endl << "Mu precession frequency 34 (MHz) = " << fMuPrecFreq34;
cout << endl << "Mu precession frequency 23 (MHz) = " << fMuPrecFreq23;
cout << endl << "Mu precession frequency 14 (MHz) = " << fMuPrecFreq14;
cout << endl << "B field (T) = " << fBfield;
cout << endl << "Mu+ electron capture rate (MHz) = " << fCaptureRate;
cout << endl << "Mu ionizatioan rate (MHz) = " << fIonizationRate;
@ -239,6 +243,10 @@ Double_t PSimulateMuTransition::PrecessionPhase(const Double_t &time, const Doub
* at the capture event. Calculate muon spin precession.
* 4) get the next electron capture time, continue until t_d is reached.
*
* <p> For isotropic muonium, TF:
* nu_12 and nu_34 with equal probabilities, probability for both states fMuFractionState1
* ni_23 and nu_14 with equal probabilities, probability for both states fMuFractionState2
*
* \param muonString if eq. "Mu+" begin with Mu+ precession
*/
void PSimulateMuTransition::Event(const TString muonString)
@ -278,10 +286,18 @@ void PSimulateMuTransition::Event(const TString muonString)
frac2 = 1. - fMuFractionState2;
if ( rndm < frac1 )
muoniumPrecessionFreq = 0.;
else if (rndm >= frac1 && rndm <= frac2)
muoniumPrecessionFreq = fMuPrecFreq1;
else
muoniumPrecessionFreq = fMuPrecFreq2;
else if (rndm >= frac1 && rndm <= frac2){
if (fRandom->Rndm() <= 0.5)
muoniumPrecessionFreq = fMuPrecFreq12;
else
muoniumPrecessionFreq = fMuPrecFreq34;
}
else{
if (fRandom->Rndm() <= 0.5)
muoniumPrecessionFreq = fMuPrecFreq23;
else
muoniumPrecessionFreq = fMuPrecFreq14;
}
if (fDebugFlag) cout << "Ioniza. time = " << ionizationTime << " Freq = " << muoniumPrecessionFreq
<< " Phase = " << fMuonPhase << endl;
@ -303,10 +319,18 @@ void PSimulateMuTransition::Event(const TString muonString)
frac2 = 1. - fMuFractionState2;
if ( rndm < frac1 )
muoniumPrecessionFreq = 0.;
else if (rndm >= frac1 && rndm <= frac2)
muoniumPrecessionFreq = fMuPrecFreq1;
else
muoniumPrecessionFreq = fMuPrecFreq2;
else if (rndm >= frac1 && rndm <= frac2){
if (fRandom->Rndm() <= 0.5)
muoniumPrecessionFreq = fMuPrecFreq12;
else
muoniumPrecessionFreq = fMuPrecFreq34;
}
else{
if (fRandom->Rndm() <= 0.5)
muoniumPrecessionFreq = fMuPrecFreq23;
else
muoniumPrecessionFreq = fMuPrecFreq14;
}
if (fDebugFlag)
cout << "Mu Ioniza. time = " << ionizationTime << " Freq = " << muoniumPrecessionFreq