Controlling Nuclear Fission Geometry

  • Thread starter nadirkazan
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  • #1

Main Question or Discussion Point

Hi everyone,
I'm an engineer and not a physicist, so forgive me if something sounds stupid.

Question: Is it possible to know, which way products of nuclear fission (u-235) will go?

Imagine a sheet of single (or few) atom layer crystal of U-235, that is irradiated by neutron source from the edge. Is it possible to predict where fission products will go?

Is it better done experimentally or can be done theoretically or through simulation?
 

Answers and Replies

  • #2
1,948
200
No, they will go randomly in any possible direction
 
  • #3
1,461
154
Why? There are at least 2 factors that are not centrally symmetrical.
One is the direction of the incoming neutron. And the other... Uranium 235 has odd number of nucleons, so it has to be a fermion. In fact, the spin happens to be 7/2... so even if the neutron happens to have opposite spin (which it would not always have) the result would be at least spin 3.

Wouldn´t the centrifugal force favour the fission products going somewhere along the equator of the U-235 nucleus rather than towards its poles?
 
  • #4
34,232
10,273
Spin is not a rotation.
There might be some dependence on the spin direction, but as you don't control that spin direction, this does not change the result.
 

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