Background_compton

Example to illustrate the background estimator (class TSpectrum) including Compton edges.

Author: Miroslav Morhac, Olivier Couet
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, August 09, 2022 at 09:42 AM.

In [1]:
Int_t i;
const Int_t nbins = 256;
Double_t xmin     = 0;
Double_t xmax     = nbins;
Double_t source[nbins];
gROOT->ForceStyle();

TH1F *d1 = new TH1F("d1","",nbins,xmin,xmax);

TString dir  = gROOT->GetTutorialDir();
TString file = dir+"/spectrum/TSpectrum.root";
TFile *f     = new TFile(file.Data());
TH1F *back = (TH1F*) f->Get("back3");
back->SetTitle("Estimation of background with Compton edges under peaks");
back->GetXaxis()->SetRange(1,nbins);
back->Draw("L");

TSpectrum *s = new TSpectrum();

for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
s->Background(source,nbins,10,TSpectrum::kBackDecreasingWindow,
              TSpectrum::kBackOrder8,kTRUE,
              TSpectrum::kBackSmoothing5,kTRUE);
for (i = 0; i < nbins; i++) d1->SetBinContent(i + 1,source[i]);
d1->SetLineColor(kRed);
d1->Draw("SAME L");
Info in <TCanvas::MakeDefCanvas>:  created default TCanvas with name c1

Draw all canvases

In [2]:
gROOT->GetListOfCanvases()->Draw()