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

Large nuclei to proton ratios reduce repulsion in a nucleus

  1. Sep 14, 2015 #1
    Hi, I am new here.
    I am just reading over my notes for stable and unstable nuclei and I came across this sentence: 'Large nuclei require a higher neutron proton ratio as this adds more nuclear attraction without adding repulsion'. I was wondering why the large ratio would reduce repulsion?
    Thank you for reading.
  2. jcsd
  3. Sep 14, 2015 #2


    User Avatar
    Education Advisor
    Gold Member

    It allows the protons, with the electric charge, to be farther apart.
  4. Sep 14, 2015 #3
    Thank you very much for your help. I understand now.
  5. Sep 15, 2015 #4

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    "Without adding repulsion" does not mean 'reducing' repulsion.
    Adding a proton increases nuclear attraction, but also increases electrostatic energy.
    Adding a neutron increases the nuclear attraction with no increase in electrostatic repulsion.
  6. Sep 15, 2015 #5


    User Avatar
    2017 Award

    Staff: Mentor

    In this case it does. It increases the effective distances between protons.
  7. Sep 15, 2015 #6
    Thank you
  8. Sep 15, 2015 #7
    Thank you for you help
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook