Kequilibration and spin enhancement effects in 120 MeV ^{16}O and 214 MeV ^{32}Sinduced fission
Abstract
The gammaray multiplicities ( M_{γ}) of fission fragments have been investigated in a variety of ^{16}O and ^{32}Sinduced reactions. The dependence of M_{γ} on target mass and excitation energy is well explained by a model which assumes the thermal excitation of angular momentum bearing collective modes. As predicted by the statistical description of fission fragment angular distributions, the value of M_{γ} is found to vary with fission fragment detection angle. The observed variation is considerably weaker than predicted by simple rigid rotation models. A large part of this discrepancy can be explained by the excitation of collective modes. For heavy targets, sequential fission contributions also weaken the angular dependence of the fragment spins. However, even with these corrections, some systems still seem to exhibit a weaker angular dependence than predicted by the model calculations. Possibly this is due to a suppression of high Kstates.
 Publication:

Nuclear Physics A
 Pub Date:
 February 1995
 DOI:
 10.1016/03759474(95)001784
 Bibcode:
 1995NuPhA.592..130S