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

Abstract

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.

arXiv commentReplaced with revised version, to appear in Phys. Lett. B

References in corpus (1)

• Five-Dimensional Fission-Barrier Calulations from Se-70 to Cf-252

Cited by in corpus (4)

• Direct Evidence of Washing out of Nuclear Shell Effects
• Sharp change over from compound nuclear fission to shape dependent quasi fission
• Interplay of fission modes in mass distribution of light actinide nuclei 225,227Pa
• Fission fragment mass distributions in reactions populating 200Pb