Results on the Influence of Neutron-Richness on Quasifission in Intermediate Mass Reactions
Date
2017
Authors
Hammerton, K. M.
Morrissey, D. J.
Kohley, Z.
Wakhle, A.
Stiefel, K.
Hinde, David
Dasgupta, M.
Williams, E.
Carter, I. P.
Cook, K. J.
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Volume Title
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World Scientific
Abstract
Superheavy elements are primarily formed through heavy ion fusion reactions. Formation of a fully equilibrated compound nucleus is a critical step in this reaction mechanism but can be hindered by orders of magnitude by quasifission, a process in which the dinuclear system breaks apart prior to full equilibration. To provide a complete description of heavy-ion fusion it is important to characterize the quasifission process. The interplay between the fusion-fission and quasifission reaction channels was explored by measuring fission mass distributions in eight different combinations of Cr+W reactions, with varying neutron-richness, at the Australian National University. The reactions were measured in two energy regimes: one at 13% above the Bass fusion barrier and one at 52.0 MeV of excitation energy in the compound nucleus, ECN*. For the systems measured at Ec.m./ VBass = 1.13 the dependence on the neutron-richness is clear. However, for the reactions at ECN* = 52.0 MeV, the dependence is less clear and additional factors are shown to play a vital role, especially the influence of deformation on the effective fusion barrier. The present work demonstrates that quasifission is an important process in competition with heavy-ion fusion in reactions with intermediate mass projectiles, particularly with more neutron-rich systems.
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Conference paper
Book Title
Fission and Properties of Neutron-Rich Nuclei : Proceedings of the Sixth International Conference on ICFN6 Sixth International Conference on Fission and Properties of Neutron-Rich Nuclei (ICFN6)
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DOI
10.1142/9789813229426_0053
Restricted until
2037-12-31