Influence of higher-order deformations in the ^{34}S + ^{168}Er fusion reaction

Details Influence of higher-order deformations in the ^{34}S + ^{168}Er fusion reaction Influence of higher-order deformations in the ^{34}S + ^{168}Er fusion reaction

2001-06-28

arxiv.org/abs/nucl-ex/0106023v2

Phys.Rev. C64 (2001) 034604

Physics

Nuclear Physics

Nuclear Experiment

15 pages, 7 figures, Latex, to be published in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.64.034604

The shape of the measured barrier distribution for the ^{34}S + ^{168}Er reaction is analysed using the coupled-channels description. The ^{168}Er nucleus is a good candidate to test current fusion models description of deformation since it has a large quadrupole deformation with an insignificant hexadecapole deformation. Coupling to weaker channels, the 2^+_1 state in ^{34}S, the 3^-_1 state in ^{168}Er, and the pair neutron transfer channel, all were found to have little influence on the barrier distribution. A successful description of the barrier distribution was only obtained after the hexacontatetrapole deformation term in ^{168}Er (beta_6) was included in the coupling scheme. However, a positive value for beta_6 was needed where the macroscopic-microscopic model predicts a negative one.

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