Abstract
The high-spin yield fraction (HSF) for the fission product g has been measured as a function of fragment emission angle (90° ≥Θ≥10°) in the (,f) system. It was seen that the HSF for or corresponding fragment (I) spin initially decreases as emission angle decreases from 90° to ≊45° and then steadily increases at lower angles (Θ<45°). Contrary to the present observation in odd-Z fission, earlier we had observed that fragment spin continuously decreases to a limit with decrease in emission angle from 90° to 20° in even-even fission. These data have been analyzed in the framework of the collective mode model invoking the effect of single particle spin. It is seen that for an odd-Z or A fissioning nucleus, angular variation of fragment spin could be accounted for on the basis of coupling between the odd nucleon spin (j≥k≊4ħ) projections and spin due to the collective rotational (tilting) degrees. Collective rotational degrees govern fragment spin for even-even fissioning nucleus.
- Received 20 October 1994
DOI:https://doi.org/10.1103/PhysRevC.51.3104
©1995 American Physical Society