Angular Momentum Effect on Probing Nuclear Dissipation with Fission Cross Section
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Graphical Abstract
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Abstract
Using the Langevin model, we study the effect of angular momentum on the drop of fission cross sections caused by friction over its standard statistical-model value, σdrop
f, as a function of presaddle friction strength β. It is found that friction effects on σdrop
f are substantially enhanced at low spin. In addition, by investigating the evolution of σdrop f with β for 195Bi, 201Bi and 207Bi nuclei, we find that friction effects become greater with increasing the neutron-to-proton ratio (N/Z) of Bi nucleus. These results suggest that on the experimental side, to precisely probe presaddle dissipation by measuring fission excitation functions, it is best to yield excited nuclear systems with a small spin and a large N/Z.
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