Correlated spins of complementary fragment pairs in the spontaneous fission of {sup 252}Cf
- Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, (United Kingdom)
A study of the {gamma}-ray decay of low-lying excited states in fragments produced in the spontaneous fission of {sup 252}Cf has revealed a significant correlation between the angles of emission of the 2{sub 1}{sup +}{yields}0{sub 1}{sup +} transitions of complementary fragment pairs. Calculations of the amount of dealignment that is needed to reproduce the measured a{sub 2} values, and a comparison with the results of previous fragment-{gamma} angular distribution measurements, suggests that at scission there may be significant population of m{ne}0 substates associated with the projection of the fragment spin vector on the fission axis. Fragments from the spontaneous fission of {sup 248}Cm emit 2{sub 1}{sup +}{yields}0{sub 1}{sup +} {gamma} rays that show markedly reduced interfragment correlations, suggesting that either a larger role is played by the relative angular momentum of the fragments, or that the dealignment introduced by the neutron emission and statistical {gamma} decay to the 2{sub 1}{sup +} state is larger in {sup 248}Cm than {sup 252}Cf fission. (c) 1999 The American Physical Society.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- OSTI ID:
- 20218009
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 60; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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