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

Need help with stable-unstable cores(cells)

  1. Dec 24, 2013 #1
    I was trying to understand the meaning of the binary Energy (Eb) ..
    For example :
    Imagine we have two cores ... 1 from an X atom and 1 from an Y atom which have the same A and X has bigger Eb than Y ... while Y is the stable core for that exact A ...
    That means
    Because energy is never lost
    Eb + EY = Ep + En ⇔ .... ⇔

    Eb = ( ZMp + NMn - MY )c2

    But what i cant understand is the following

    Why isnt X more stable as it has bigger binary energy therefore the same number of protons and netrons are hold by bigger power ?

    HOWEVER if we look at the opposite way
    Why isnt any core with smaller binary energy and same A than X stablier because its stableness would require less energy ...

    But our researches have shown that both above are not true ... but why ?
  2. jcsd
  3. Dec 24, 2013 #2


    User Avatar
    2017 Award

    Staff: Mentor

    What is "binary energy"? Do you mean "binding energy"?

    An atom K can decay into another atom L of the same nucleon number if L has a larger binding energy, the opposite is not possible neglecting electron capture.
  4. Dec 25, 2013 #3

    This doent answer my question .....
    I am wondering about which cell is stablier K or L (fro your example ) .. and why ...
  5. Dec 25, 2013 #4


    User Avatar
    2017 Award

    Staff: Mentor

    If both are unstable, there is no general rule for their lifetimes, it depends on too many other factors (like nuclear spin, odd/even proton/neutron numbers and so on). The setup you described in post 1 (instable atom with larger binding energy decaying to stable atom with smaller binding energy) is not possible. Again, neglecting electron capture.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Need help with stable-unstable cores(cells)
  1. Stable or Unstable (Replies: 14)