Dynamical Properties of the Fission Fragments

Because of the large number of possible neutron-rich fragments produced in fission, the study of the y rays emitted by the fragments can lead to useful information about the nuclear structure of these exotic, short-lived nuclei far from stability. 

For the general case, Wheeler (1963) showed that the probability of emitting a fragment at an angle 0 from a transition nucleus characterized by J, K, and M is 

The first term represents a statistical weighting factor, the second term a solid angle factor for the probability of getting the angle 0, and the third term is a symmetric top wave function. 

Then K h the root-mean-square projection of 7 upon the nuclear symmetry axis, can be calculated as  

If one can estimate K2h then the fission angular distributions can be used to measure 7 or vice versa. 

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