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

A All experimental data for Super heavy nuclei

Tags:
  1. Oct 17, 2017 #1
    dear physicists

    I need all the half life experimental data available so far, for SHNs, I mean Z=104 - 118

    (T1/2)

    can you help me?

    where do I get access to this data?
     
    Last edited by a moderator: Oct 18, 2017
  2. jcsd
  3. Oct 17, 2017 #2

    phyzguy

    User Avatar
    Science Advisor

  4. Oct 18, 2017 #3
  5. Oct 18, 2017 #4

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    If you don't tell us what about phyzguy's link that you need to know and is absent, how can we possibly steer you in the right direction?
     
  6. Oct 18, 2017 #5

    phyzguy

    User Avatar
    Science Advisor

    I wondered that too. It has the half-lives and the decay paths. What else are you looking for?
     
  7. Oct 18, 2017 #6

    dear Vanadium 50
    let me explain
    for example open following link related to in Cn283
    http://www.nndc.bnl.gov/chart/reCenter.jsp?z=112&n=171

    alpha decay probability is 50% and spontaneous fission probability is 50% (various nuclei are in the same condition by to distinct percentage)

    but in that chart we have just 1 half life for Cn283 that is related to alpha dacay or related to spontaneous fission
    so another data is absent
    if 4.0 s +13-7 is belong to alpha decay then what is half life of spontaneous fission
    am i right?
     
    Last edited by a moderator: Oct 18, 2017
  8. Oct 18, 2017 #7

    dear phyzguy
    as i said
    when we have 2 or more types of decay we need 2 or more data for half life
    but in that link and another references just 1 number reported as half life
    may be Im wrong
     
  9. Oct 18, 2017 #8

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    There is just one half life. It is the time until 50% decayed, no matter which type of decay happened.

    You can get partial decay widths (sometimes interpreted as a "partial half life") from the half life and the branching fractions.
     
  10. Oct 18, 2017 #9

    dear mfb

    Tnq 4 your reply

    I think reported half life is related to dominant mode

    for probability calculation we need 2 half lifes to use following formulas:

    P% alpha decay =(alpha decay width)/(alpha decay width + fission width)
    P% fission =(fission width)/(alpha decay width + fission width)

    for using these formulas we should have both fission and alpha half lifes
     
  11. Oct 18, 2017 #10

    phyzguy

    User Avatar
    Science Advisor

    No, mfb is right. There is just one half-life which includes all decay modes. You're given the total decay width (from the half life) and the branching fractions, so you can calculate the partial decay widths, just like mfb said.
     
  12. Oct 18, 2017 #11

    I do not understand
    Where do these percentages come from?
    Is not it necessary to have 2 data to calculate percentages?
    How can we calculate these branch ratios with just one half-life?
     
  13. Oct 18, 2017 #12

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    The branching ratios are not calculated from the half life, they are measured, typically by counting the decays for superheavy nuclides. The half life is measured as well.
    From these two measurements together you can calculate partial decay widths.
     
  14. Oct 18, 2017 #13
    • Member warned that "text-speak" is not permitted at this site
    TNQ very much dear mfb

    U R right
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted