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
    Hi....!
    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

    mfb

    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
    Yes

    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

    mfb

    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.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...