Why does 135Xe have a high thermal neutron cross section?

  • Thread starter pierce15
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  • #1
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Title says it all. Made a few google searches and couldn't find any information. Is there a reason why it is so large, or is it just a coincidence of nature?
 

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  • #2
Astronuc
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It would seem to be a coincidence of Nature. Isotopes Xe-134 and Xe-136 have very low absorption cross-sections, and are stable.

One has to look at certain rare earth isotopes of Sm-149, -151 and Gd-155, -157 to find comparable absorption cross-sections.
 
  • #3
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And a common underlying cause for such coincidences seem to be the presence of suitable excited states (real or virtual).
 

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