Woods-Saxon potential parametrization at large deformations for plutonium odd isotopes
F. Garcia1,7 - E. Garrote2 - M.-L. Yoneama3 - J.D.T. Arruda-Neto1,6 - J. Mesa1 - F. Bringas1 - J.F. Dias5 - V.P. Likhachev1 - O. Rodriguez4 - F. Guzmán4
1 Instituto de Física - Universidade de São Paulo, CP: 66318 - CEP: 05315-970
- São Paulo (SP), Brazil
2 Departamento de Física Teórica. Universidad Autónoma de Madrid, E-28049 Madrid,
Spain
3 Centro de Ciências Exatas - UNISINOS, C.P. 275 - CEP 93001-970 - São Leopoldo (RS),
Brazil
4 Instituto Superior de Ciencia y Tecnología Nucleares, Apartado Postal 6163 - Havana,
Cuba
5 Instituto de Física - Universidade Federal do Rio Grande do Sul, CP: 15051 - CEP
91501-970 - Porto Alegre (RS), Brazil
6 Universidade de Santo Amaro-UNISA, São Paulo (SP), Brazil
7 Universidade Estadual de Santa Cruz, Departamento de Ciências Exatas, Ilhéus, Bahia,
Brazil
Received: 20 October 1998 / Revised version: 6 May 1999 Communicated by B. Povh
Abstract
The structure of single-particle levels in the second minima of 237,239,241Pu was analyzed with the help of an axially-deformed
Woods-Saxon potential. The nuclear shape was parametrized in terms of the
cassinian ovaloids. A parametrization of the spin-orbit part of the
potential was obtained in the region corresponding to large deformations
(second minimum), depending only on the nuclear surface area. With this
parametrization, we were able to reproduce successfully the spin, parity and
energies of the rotational band built on the 8
s isomeric state in 239Pu and, also, a spin assignment for both isomeric states in 237Pu and 241Pu was carried out.
PACS
25.85.-W Fission reactions -
25.70.Gh Compound nucleus -
21.60.-n Nuclear-structure models and methods -
21.60.Cs Shell model
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