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

  1. Apr 8, 2017 #1
    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?
  2. jcsd
  3. Apr 8, 2017 #2


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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.
  4. Apr 9, 2017 #3
    And a common underlying cause for such coincidences seem to be the presence of suitable excited states (real or virtual).
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