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Controlling Nuclear Fission Geometry

by nadirkazan
Tags: controlling, fission, geometry, nuclear
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Oct16-13, 06:16 PM
P: 1
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?
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Oct17-13, 08:36 AM
P: 1,948
No, they will go randomly in any possible direction
Oct18-13, 03:18 AM
P: 381
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?

Oct18-13, 12:21 PM
P: 11,631
Controlling Nuclear Fission Geometry

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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