View source for Run6980 Y88

==Photon Lines==
	
{| border="1"  |cellpadding="20" cellspacing="0 
|-
|  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 ==

[[File:r6978_HpGe.png | 200 px]][[File:r6978_NaI.png | 200 px]]

==Coincidence Lines==

{| border="1"  |cellpadding="20" cellspacing="0 
|-
|  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();


[[File:r6978_6980HpGeOverlay.png | 200 px]][[File:r6980TDCdiff.png | 200 px]]


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();

[[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]]