Emission angle dependence of fission fragment spin: Effects of single particle spin and tilting mode

T. Datta, H. Naik, and S. P. Dange
Phys. Rev. C 51, 3104 – Published 1 June 1995
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Abstract

The high-spin yield fraction (HSF) for the fission product Im,132g has been measured as a function of fragment emission angle (90° ≥Θ≥10°) in the Np237(α29MeV,f) system. It was seen that the HSF for I132 or corresponding fragment (134I) 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 Am241 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 Pu242 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 (jk≊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

Authors & Affiliations

T. Datta, H. Naik, and S. P. Dange

  • Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay 400 085, India

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Issue

Vol. 51, Iss. 6 — June 1995

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