Evidence of microscopic effects in fragment mass distribution in heavy ion induced fusion-fission reactions

Details Evidence of microscopic effects in fragment mass distribution in heavy ion induced fusion-fission reactions Evidence of microscopic effects in fragment mass distribution in heavy ion induced fusion-fission reactions

2005-06-27

arxiv.org/abs/nucl-ex/0506026v1

Phys.Lett.B627:26-31,2005

Physics

Nuclear Physics

Nuclear Experiment

Replaced with revised version, to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.08.116

Our measurements of variances ($\sigma_{m}^2$) in mass distributions of fission fragments from fusion-fission reactions of light projectiles (C, O and F) on deformed thorium targets exhibit a sharp anomalous increase with energy near the Coulomb barrier, in contrast to the smooth variation of $\sigma_{m}^2$ for the spherical bismuth target. This departure from expectation based on a statistical description is explained in terms of microscopic effects arising from the orientational dependence in the case of deformed thorium targets.

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