Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Mattauch violation at 247?

  1. Oct 6, 2017 #1
    Notorious Mattauch violations are:
    Sb-123 and Te-123 (both stable)
    Hf-180 and Ta-180 (both stable)
    But should Cm-247 and Bk-247 also count?
    Both are radioactive - but only to alpha decay and, in case of Bk-247, fission.
    Does the absence of electron capture or beta decay count as third Mattauch violation?
     
  2. jcsd
  3. Oct 7, 2017 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Are you sure there are no beta decays or electron capture possible? The non-observation doesn’t mean they don’t exist, especially for exotic nuclides.
     
  4. Oct 8, 2017 #3

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Bk-247 decays by beta emission to Cm-247. However it will be very slow: possibly millions of years.
     
  5. Oct 9, 2017 #4
    By both emission and capture, or by capture alone?
     
  6. Oct 9, 2017 #5

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    You can look up the masses and calculate it yourself.
     
  7. Oct 9, 2017 #6

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    That was very polite.
     
  8. Oct 9, 2017 #7
    I seem to get
    Cm-247: 247.070354
    Bk-247: 247.070307

    Is that the mass of atom, with electrons?
     
  9. Oct 9, 2017 #8

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Yes.
     
  10. Oct 10, 2017 #9
    Which means that it is Cm-247 which is heavier.
     
  11. Oct 10, 2017 #10

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Right.
     
  12. Oct 10, 2017 #11
    Then might Cm-247 undergo beta decay?
    Cm-247 is also notable for absence of spontaneous fission.
     
  13. Oct 10, 2017 #12

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    It is not impossible. With the tiny energy difference and the large spin difference it is extremely unlikely, however.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Mattauch violation at 247?
  1. CP Violation (Replies: 1)

  2. CP violation? (Replies: 5)

Loading...