void example(double E0 = 50, int nevents = 100000)
{
TStopwatch timer;
// compound nucleus = carbon
KVNucleus CN(6, 12);
CN.SetExcitEnergy(E0);
// decay products
KVEvent decay;
KVNucleus* n = decay.AddParticle();
n->SetZandA(1, 2);
n = decay.AddParticle();
n->SetZandA(2, 4);
n = decay.AddParticle();
n->SetZandA(3, 6);
MicroStat::mdweight gps;
Double_t etot = E0 + decay.GetChannelQValue();
Double_t total_mass = decay.GetSum("GetMass");
if (etot <= 0) {
printf("Break-up channel is not allowed\n");
return;
}
gps.SetWeight(&decay, etot);
gps.initGenerateEvent(&decay);
std::cout << "Edisp = " << etot << " MeV" << std::endl;
KVHashList histos;
TH1F* h;
while ((n = decay.GetNextParticle())) {
Double_t kappa = total_mass / (total_mass - n->GetMass());
std::cout << n->GetSymbol() << " : max KE = " << 1. / kappa << " * " << etot << " MeV" << std::endl;
std::cout << n->GetSymbol() << " : m/M = " << n->GetMass() / total_mass << " k = " << kappa << std::endl;
histos.Add(h = new TH1F(n->GetSymbol(), Form("Kinetic energy of %s", n->GetSymbol()), 200, 0, etot));
h->Sumw2();
}
KVEvent event;
while (nevents--) {
gps.GenerateEvent(&decay, &event);
while ((n = event.GetNextParticle()))((TH1F*)histos.FindObject(n->GetSymbol()))->Fill(n->GetE());
gps.resetGenerateEvent();
}
TIter it(&histos);
while ((h = (TH1F*)it())) {
KVNucleus part(h->GetName());
new TCanvas;
FitEDist(h, etot, decay.GetMult(), total_mass, part.GetMass());
}
timer.Print();
}
void example(double E0 = 50, int nevents = 100000)
{
TStopwatch timer;
// 12C* -> 3(4He)
// compound nucleus = carbon
KVNucleus CN(6, 12);
CN.SetExcitEnergy(E0);
// decay products
KVEvent decay;
KVNucleus* n = decay.AddParticle();
n->SetZandA(2, 4);
n = decay.AddParticle();
n->SetZandA(2, 4);
n = decay.AddParticle();
n->SetZandA(2, 4);
MicroStat::mdweight gps;
Double_t etot = E0 + decay.GetChannelQValue();
if (etot <= 0) {
printf("Break-up channel is not allowed\n");
return;
}
gps.SetWeight(&decay, etot);
gps.initGenerateEvent(&decay);
TH1F* h1 = new TH1F("h1", "Kinetic energy of alpha particle 3", 200, 0, etot * 2. / 3.);
h1->Sumw2();
KVEvent event;
while (nevents--) {
gps.GenerateEvent(&decay, &event);
h1->Fill(event.GetParticle(3)->GetKE());
gps.resetGenerateEvent();
}
h1->Draw();
TF1* EDis = new TF1("EDis", edist, 0., etot, 3);
EDis->SetNpx(500);
EDis->SetParLimits(0, 0, 1.e+08);
EDis->SetParLimits(1, 0, 2 * etot);
EDis->FixParameter(2, 3);
gStyle->SetOptFit(1);
h1->Fit(EDis, "EM");
timer.Print();
}