1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Fission reaction

  1. Nov 28, 2015 #1
    a certain fission reaction releases 3 neutrons.

    how many of these neutrons must go on to produce a subsequent fission if a chain reaction is to be sustained?
  2. jcsd
  3. Nov 29, 2015 #2


    User Avatar

    Staff: Mentor

    What do you think and why?
  4. Nov 29, 2015 #3


    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    is this homework ? looks like it

    how about posting in the homework section and use the proper template
    and show us what you have discovered so far in your research on the subject :smile:

  5. Nov 29, 2015 #4
    To sustain a chain reaction each individual reaction must produce at least one more reaction so at least one of the three neutrons released in a reaction must result in another fission reaction for the reaction to be sustained. The released neutrons will normally be highly energetic fast neutrons and at least for fissionable materials with high cross-sections for thermal neutrons, the energy of the neutrons must be reduced to thermal energies before a fission reaction is likely to take place.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook