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An unique anomalous decay Q(β+)<0

  1. Feb 18, 2016 #1
    Normally 87Rb can decay to 87Sr because Q(β-)= 282.2keV in a half life of 4.97*10^10 years.
    But do you know 87Sr can also decay back to 87Rb by EC(Electron Capture) in a very short half life 2.815 hours by a little chance of 0.3%?
    Of course, the reverse decay can not happen naturally, because Q(β+)= -Q(β-) = -282.2keV < 0, the only condition is that 87Sr should be excited to level of 388keV with spin-parity 1/2-.
    This example is so unique!
    I am wondering if this bi-direction decay phenomenon could apply to any other isotopes?
    Last edited: Feb 18, 2016
  2. jcsd
  3. Feb 23, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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