Dependence of heavy-ion fusion reaction on nuclear deformation and nuclear shell structure

Journal Article · Tue Apr 02 04:00:00 EST 2002 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1469999· OSTI ID:20618916

Ikezoe, H; Mitsuoka, S; Nishio, K; Satou, K; Nishinaka, I ^[1]

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1. Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-1195 (Japan)

The dependence of the fusion probability on the orientation of deformed nuclei was investigated for the {sup 60,64}Ni+{sup 154}Sm and {sup 76}Ge+{sup 150}Nd reactions. Evaporation residues were measured for these reaction systems in the vicinity of the Coulomb barrier and the fusion probability was extracted as a function of bombarding energy. It was found that the fusion probability depends strongly on the orientation of the nuclear deformation. The fusion probability is considerably reduced when the projectiles collide at the tip of the deformed nuclei. On the other hand, when the projectiles collide at the side of the deformed nuclei, the fusion occurs without hindrance. This phenomenon is understood qualitatively by comparing the distance between the mass centers of two colliding nuclei at touching with the position of the saddle point of the compound nucleus. The dependence of the fusion probability on the nuclear shell structure was also investigated for the {sup 82}Se+{sup 134,138}Ba reactions, where the nucleus {sup 138}Ba has a closed neutron shell of N=82. The evaporation residue cross section for the {sup 82}Se+{sup 134}Ba reaction was about 100 times smaller than those for the {sup 82}Se+{sup 138}Ba reaction.

• OSTI ID: 20618916
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 610; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARIUM 134 TARGET
BARIUM 138 TARGET
COMPOUND NUCLEI
COULOMB FIELD
CROSS SECTIONS
DEFORMED NUCLEI
DISTANCE
EVAPORATION MODEL
GERMANIUM 76 REACTIONS
HEAVY ION FUSION REACTIONS
NEODYMIUM 150 TARGET
NICKEL 60 REACTIONS
NICKEL 64 REACTIONS
NUCLEAR DEFORMATION
POTENTIAL ENERGY
SAMARIUM 154 TARGET
SELENIUM 82 REACTIONS
SHELL MODELS