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
    2017 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
    2017 Award

    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
    2017 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
    2017 Award

    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
    2017 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
    2017 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
    2017 Award

    Staff: Mentor

    It is not impossible. With the tiny energy difference and the large spin difference it is extremely unlikely, however.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted