Difference between revisions of "Run6980 Y88"

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Line 53: Line 53:
 
ntuple->Draw("ADC7*0.595486-52.2669 >>r6978(2200,0,4400)")
 
ntuple->Draw("ADC7*0.595486-52.2669 >>r6978(2200,0,4400)")
 
TH1F *r6978HpGeN=new TH1F("r6978HpGeN","r6978HpGeN",2200,0,4400)
 
TH1F *r6978HpGeN=new TH1F("r6978HpGeN","r6978HpGeN",2200,0,4400)
r6978HpGeN->Add(r6978HpGe,0.003584229);
+
r6978HpGeN->Add(r6978,0.003584229);
  
  
Line 73: Line 73:
  
  
 +
[[File:r6978_6980HpGeOverlay.png | 200 px]][[File:r6980TDCdiff.png | 200 px]]
  
  
 +
The coincidence rate is a factor of 20 lower than the Singles rate
  
=== 898 keV in HpGe and 1840 in NaI===
+
A gaussian fit to the above TDC spectrum yields a mean of 114 nsec and a Sigma of 143 nsec.
 +
 
 +
 
 +
=== 898 keV in HpGe with a cut around the 1840 keV line in NaI===
 +
 
 +
 
 +
ntuple->Draw("ADC7*0.595486-52.2669 >>r6978(2200,0,4400)")
 +
TH1F *r6978HpGeN=new TH1F("r6978HpGeN","r6978HpGeN",2200,0,4400)
 +
r6978HpGeN->Add(r6978,0.003584229);
 +
 
 +
 
 +
ntuple->Draw("ADC7*0.595486-52.2669 >>r6980(2200,0,4400)","ADC3>1440 && ADC3 < 1560")
 +
TH1F *r6980HpGeN=new TH1F("r6980HpGeN","r6980HpGeN",2200,0,4400)
 +
r6980HpGeN->Add(r6980,0.000012405);
 +
 
 +
overlaying two plots
 +
 
 +
r6978HpGeN->Draw();
 +
Float_t rightmax = 1.1*r6980HpGeN->GetMaximum();
 +
Float_t scale = gPad->GetUymax()/rightmax;
 +
r6980HpGeN->Scale(scale);
 +
r6980HpGeN->Draw("same");
 +
TGaxis *axis = new TGaxis(gPad->GetUxmax(),gPad->GetUymin(),gPad->GetUxmax(), gPad->GetUymax(),0,rightmax,510,"+L");
 +
axis->SetLineColor(kRed);
 +
axis->SetLabelColor(kRed);
 +
axis->Draw();
  
 
[[File:r6980_1840NaICoin.png | 200 px]]
 
[[File:r6980_1840NaICoin.png | 200 px]]
  
 +
=== 1840 keV in HpGe with a cut around the NaI detectors 898 peak===
 +
ntuple->Draw("ADC7*0.595486-52.2669 >>r6978(2200,0,4400)")
 +
TH1F *r6978HpGeN=new TH1F("r6978HpGeN","r6978HpGeN",2200,0,4400)
 +
r6978HpGeN->Add(r6978,0.003584229);
 +
 +
 +
ntuple->Draw("ADC7*0.595486-52.2669 >>r6980(2200,0,4400)","ADC3>780 && ADC3 < 810")
 +
TH1F *r6980HpGeN=new TH1F("r6980HpGeN","r6980HpGeN",2200,0,4400)
 +
r6980HpGeN->Add(r6980,0.000012405);
 +
 +
overlaying two plots
 +
 +
r6978HpGeN->Draw();
 +
Float_t rightmax = 1.1*r6980HpGeN->GetMaximum();
 +
Float_t scale = gPad->GetUymax()/rightmax;
 +
r6980HpGeN->Scale(scale);
 +
r6980HpGeN->Draw("same");
 +
TGaxis *axis = new TGaxis(gPad->GetUxmax(),gPad->GetUymin(),gPad->GetUxmax(), gPad->GetUymax(),0,rightmax,510,"+L");
 +
axis->SetLineColor(kRed);
 +
axis->SetLabelColor(kRed);
 +
axis->Draw();
 +
 +
[[File:r6980_898NaICoin.png | 200 px]]
 +
 +
There appears to be a chance to detect two 898 keV photons in both detectors in coincidence?  Probably one is an accidental.
 +
 +
 +
Is the 1320 keV line real?
 +
 +
The 511 keV seems to always be there as well.  Is it an accidental?
  
  
 
[[PAA_11-11-13#Y-88_coincidence_lines]]
 
[[PAA_11-11-13#Y-88_coincidence_lines]]

Latest revision as of 17:15, 11 February 2014

Photon Lines

Energy (keV) Relative Intensity
850.6 0.065
898.042 93.7
1382.2 0.021
1836.063 99.2
2734.0 0.71
3219.7 0.0070


E(γ) Coincidence

  850.6	898.042, 1836.063, 2734.0
  850.6	898.042, 1836.063, 2734.0
  898.042	850.6, 850.6, 1836.063
  898.042	1836.063
 1382.2	1836.063
 1382.2	1836.063
 1836.063	850.6, 850.6, 898.042, 898.042, 1382.2, 1382.2
 2734.0	850.6, 850.6

Calibration

ntuple->Draw("ADC3*1.29679-127.215 >>(2200,0,4400)")

ntuple->Draw("ADC7*0.595486-52.2669 >>(2200,0,4400)")

Singles Run 6978

R6978 HpGe.pngR6978 NaI.png

Coincidence Lines

Run Description
6978 OR mode using Y-88 sample # 130113-004 , post amp at 20, rate is 695 Hz, CFD's still at 12 mV for NaI detector and 10 mV for HpGe , 4 min 39 sec
6980 AND mode using Y-88 sample # 130113-004 , post amp at 20, rate is Hz, CFD's still at 12 mV for NaI detector and 10 mV for HpGe , min sec, 10 Hz pulser wasn't working for run 6975-6978, it is working for this run

ntuple->Draw("ADC7*0.595486-52.2669 >>r6978(2200,0,4400)") TH1F *r6978HpGeN=new TH1F("r6978HpGeN","r6978HpGeN",2200,0,4400) r6978HpGeN->Add(r6978,0.003584229);


ntuple->Draw("ADC7*0.595486-52.2669 >>r6980(2200,0,4400)") TH1F *r6980HpGeN=new TH1F("r6980HpGeN","r6980HpGeN",2200,0,4400) r6980HpGeN->Add(r6980,0.000012405);

overlaying two plots

r6978HpGeN->Draw();
Float_t rightmax = 1.1*r6980HpGeN->GetMaximum();
Float_t scale = gPad->GetUymax()/rightmax;
r6980HpGeN->Scale(scale);
r6980HpGeN->Draw("same");
TGaxis *axis = new TGaxis(gPad->GetUxmax(),gPad->GetUymin(),gPad->GetUxmax(), gPad->GetUymax(),0,rightmax,510,"+L");
axis->SetLineColor(kRed);
axis->SetLabelColor(kRed);
axis->Draw();


R6978 6980HpGeOverlay.pngR6980TDCdiff.png


The coincidence rate is a factor of 20 lower than the Singles rate

A gaussian fit to the above TDC spectrum yields a mean of 114 nsec and a Sigma of 143 nsec.


898 keV in HpGe with a cut around the 1840 keV line in NaI

ntuple->Draw("ADC7*0.595486-52.2669 >>r6978(2200,0,4400)") TH1F *r6978HpGeN=new TH1F("r6978HpGeN","r6978HpGeN",2200,0,4400) r6978HpGeN->Add(r6978,0.003584229);


ntuple->Draw("ADC7*0.595486-52.2669 >>r6980(2200,0,4400)","ADC3>1440 && ADC3 < 1560") TH1F *r6980HpGeN=new TH1F("r6980HpGeN","r6980HpGeN",2200,0,4400) r6980HpGeN->Add(r6980,0.000012405);

overlaying two plots

r6978HpGeN->Draw();
Float_t rightmax = 1.1*r6980HpGeN->GetMaximum();
Float_t scale = gPad->GetUymax()/rightmax;
r6980HpGeN->Scale(scale);
r6980HpGeN->Draw("same");
TGaxis *axis = new TGaxis(gPad->GetUxmax(),gPad->GetUymin(),gPad->GetUxmax(), gPad->GetUymax(),0,rightmax,510,"+L");
axis->SetLineColor(kRed);
axis->SetLabelColor(kRed);
axis->Draw();

R6980 1840NaICoin.png

1840 keV in HpGe with a cut around the NaI detectors 898 peak

ntuple->Draw("ADC7*0.595486-52.2669 >>r6978(2200,0,4400)") TH1F *r6978HpGeN=new TH1F("r6978HpGeN","r6978HpGeN",2200,0,4400) r6978HpGeN->Add(r6978,0.003584229);


ntuple->Draw("ADC7*0.595486-52.2669 >>r6980(2200,0,4400)","ADC3>780 && ADC3 < 810") TH1F *r6980HpGeN=new TH1F("r6980HpGeN","r6980HpGeN",2200,0,4400) r6980HpGeN->Add(r6980,0.000012405);

overlaying two plots

r6978HpGeN->Draw();
Float_t rightmax = 1.1*r6980HpGeN->GetMaximum();
Float_t scale = gPad->GetUymax()/rightmax;
r6980HpGeN->Scale(scale);
r6980HpGeN->Draw("same");
TGaxis *axis = new TGaxis(gPad->GetUxmax(),gPad->GetUymin(),gPad->GetUxmax(), gPad->GetUymax(),0,rightmax,510,"+L");
axis->SetLineColor(kRed);
axis->SetLabelColor(kRed);
axis->Draw();

R6980 898NaICoin.png

There appears to be a chance to detect two 898 keV photons in both detectors in coincidence? Probably one is an accidental.


Is the 1320 keV line real?

The 511 keV seems to always be there as well. Is it an accidental?


PAA_11-11-13#Y-88_coincidence_lines