Difference between revisions of "July 6, 2007 Neutron Capture in lead"

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Paraffin wax layer of thickness 12.6 cm was used as a neutron attenuator and for cosmic rays lead of thickness 10 cm on sides of HpGe detector. The source was Cf-252 without and with lead container of 60μCi activity.<br>
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== 1. Energy Region 100-500 keV ==
 
== 1. Energy Region 100-500 keV ==
 
[[Image:with_lead_without_CF_252_gamma_spectra100_500.jpg]]
 
[[Image:with_lead_without_CF_252_gamma_spectra100_500.jpg]]
  
== 2. Energy Region 500-900 keV==
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== 2. Energy Region 500-900 keV ==
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[[Image:with_lead_without_CF_252_gamma_spectra500_900.jpg]]<br>
 
[[Image:with_lead_without_CF_252_gamma_spectra500_900.jpg]]<br>
We have sharp peak on 803 keV, which is the result of the lead container. This line coressponds to thermal-neutron capture in lead Pb-205.[http://www.nndc.bnl.gov/capgam/byn/page239.html]
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We have sharp peak on 803 keV, which is the result of the lead container. This line coressponds to thermal-neutron capture in lead Pb-206.[http://prola.aps.org/pdf/PR/v95/i6/p1482_1]. However, 388 kev and 333 kev, energy lines of Cf-249 are more dominant without lead.<br>
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For energy line 803 keV    ( # of counts without lead / # of count with  lead ) =0.5
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[http://arxiv.org/abs/0707.3679 (n,<math>\gamma) from Pb-206 from 1 ev to 600 keV</math>]

Latest revision as of 14:20, 26 July 2007

Paraffin wax layer of thickness 12.6 cm was used as a neutron attenuator and for cosmic rays lead of thickness 10 cm on sides of HpGe detector. The source was Cf-252 without and with lead container of 60μCi activity.

1. Energy Region 100-500 keV

With lead without CF 252 gamma spectra100 500.jpg

2. Energy Region 500-900 keV

With lead without CF 252 gamma spectra500 900.jpg
We have sharp peak on 803 keV, which is the result of the lead container. This line coressponds to thermal-neutron capture in lead Pb-206.[1]. However, 388 kev and 333 kev, energy lines of Cf-249 are more dominant without lead.
For energy line 803 keV ( # of counts without lead / # of count with lead ) =0.5

(n,[math]\gamma) from Pb-206 from 1 ev to 600 keV[/math]