Difference between revisions of "Run6973 BckGrd"

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Run 6973
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=Singles backgrounds=
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Singles back ground sources
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Tl-208: 277, 583, 860
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Pb-214: 241, 295, 351
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Bi-214: 609, 1120, 1238, 1764
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=Run 6973=
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run time recorded by 10 Hx clock into scaler channel 5
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5976273-66=5976207/10 = 59762.07 seconds = 166 hrs = 6.9 days
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At event number 1941300 the scaler reads the same value,  I think the DAQ failed right when the HV on the HpGe tripped.
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The HpGe detector warmed up during the run after about Event Number 1916000,  you can tell the HV tripped because ADC7 starts loose events above 1500 channels after EventNumber >1910300
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compare the plots
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ntuple->Draw("ADC7 >>(1100,0,4400)","EventNumber>1941300 && EventNumber < 2000000")
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ntuple->Draw("ADC7 >>(1100,0,4400)","EventNumber>1901300 && EventNumber < 2000000")
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The following lines were observed by the HpGe detector.
 
The following lines were observed by the HpGe detector.
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<math>{152 \atop \; }Eu \rightarrow {196 \atop \; }Pt^* </math> with a half life of 6 days.
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<math>{152 \atop \; }Eu \rightarrow {152 \atop \; }Sm^* + e^+ \rightarrow {152 \atop \; }Sm  + \gamma</math> with a half life of 13 years.
 
 
Eu-152: 385.69, e+
 
  
Eu-152: 441, e+
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gamma lines are at : 386, 493
  
 
== NaI 2103 Coincidence cut==
 
== NaI 2103 Coincidence cut==

Latest revision as of 21:31, 9 January 2014

Singles backgrounds

Singles back ground sources

Tl-208: 277, 583, 860

Pb-214: 241, 295, 351

Bi-214: 609, 1120, 1238, 1764

Run 6973

run time recorded by 10 Hx clock into scaler channel 5

5976273-66=5976207/10 = 59762.07 seconds = 166 hrs = 6.9 days

At event number 1941300 the scaler reads the same value, I think the DAQ failed right when the HV on the HpGe tripped.


The HpGe detector warmed up during the run after about Event Number 1916000, you can tell the HV tripped because ADC7 starts loose events above 1500 channels after EventNumber >1910300

compare the plots

ntuple->Draw("ADC7 >>(1100,0,4400)","EventNumber>1941300 && EventNumber < 2000000")

ntuple->Draw("ADC7 >>(1100,0,4400)","EventNumber>1901300 && EventNumber < 2000000")


The following lines were observed by the HpGe detector.

387, 583, 609, 1273, 1456, 1591, 2103

R6973 HpGe raw.pngR6973 NaI raw.png


NaI 511 coincidence cut

Place a cut around the 511 keV photons seen in the NaI detector yields the following lines observed by the HpGe detector as shown below.

(386, 438, 491, 511, 582, 950, 1255, 1273, 1591, 2103 keV)

R6973 HpGe NaI511CoinCut.pngR6973 HpGe NaI511CoinCutLog.png


[math]{152 \atop \; }Eu \rightarrow {152 \atop \; }Sm^* + e^+ \rightarrow {152 \atop \; }Sm + \gamma[/math] with a half life of 13 years.

gamma lines are at : 386, 493

NaI 2103 Coincidence cut

Place a cut around the 2103 keV photons seen in the NaI detector yields a 511 and a 583 keV line observed by the HpGe detector as shown below.

R6973 HpGe NaI2103CoinCut.png A line at 388 keV

Possible Isotopes
U-235 (388 - 142,64.5)
Cf-249 (many coincidence lines)

A clear 511 line

NaI cut on 2100 keV intensifies 511 keV line,

ntuple->Draw("ADC7*0.604262-54.0539-ADC7*ADC7*5.62792e-07 >>(2200,0,4400)","ADC3>1600 & ADC3<1800")

A line at 609 keV

Possible isotopes
Pa-231


A line at 1273 keV

A line at 1593 keV


A line at 2105 keV


PAA_11-11-13#Background_coincidence_lines