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!

Homework Help: Rotational energy of nuclear excited states

  1. Apr 10, 2010 #1
    1. The problem statement, all variables and given/known data
    Rotation of a deformed nucleus is predicted to produce nuclear excited states with energies given by E(J)=J(J+1)hbar/2I. The first two excited states of 238 U are Jpi = 2+(0.045MeV) and Kpi=4+(0.148MeV). Show these energies are consistent with rotational excitation stating any assumptions you make

    3. The attempt at a solution
    I is the moment of inertia of the nucleus. I=2/5 MR^2
    For 238U I=2/5 * (92*938.272 +92*0.511 + 146*939.566) * [1.2 * (238)^1/3 ]^2

    But I am getting a value of 4945058.626MeV fm^2 = 4.945...x10^-24 MeV
    which is not giving me 0.045MeV for the 2+ state!??!?!!

    any idea where I am going wrong?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted