Role of transitional levels in {sup 237}Np ({gamma},f): Perspectives for studying highly deformed systems

The transition levels at the top of the two {sup 237}Np fission barriers were obtained for the first time by means of the so-called semimicroscopic combined method, which we have developed and implemented. To overcome the difficulties in dealing with large nuclear deformations, we used our developed...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2006-09, Vol.74 (3)
Main Authors: Arruda-Neto, J. D. T., Universidade de Santo Amaro/UNISA, Sao Paulo, SP, Mesa, J., Garcia, F., Rodriguez, O., Instituto Superior de Tecnologias y Ciencias Aplicadas, Havana, Geraldo, L. P., Universidade Catolica de Santos/UNISANTOS, Santos, SP, Garcia, C., Guzman, F., Rodrigues, T. E., Shtejer, K., Semmler, R.
Format: Article
Language:English
Subjects:
COORDINATES
CROSS SECTIONS
DEFORMED NUCLEI
FISSION BARRIER
NEPTUNIUM 237
NUCLEAR DEFORMATION
NUCLEAR PHYSICS AND RADIATION PHYSICS
PHOTOFISSION
SINGLE-PARTICLE MODEL
WOODS-SAXON POTENTIAL
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Summary:The transition levels at the top of the two {sup 237}Np fission barriers were obtained for the first time by means of the so-called semimicroscopic combined method, which we have developed and implemented. To overcome the difficulties in dealing with large nuclear deformations, we used our developed BARRIER code, which calculates single-particle spectra in a deformed Woods-Saxon potential using a coordinate system based on Cassini ovaloids as nuclear shape parametrization. The results enabled us to describe the experimentally observed near-barrier photofission cross-section structures for {sup 237}Np, as well as a subbarrier shelf, the latter being consistently interpreted in terms of the accumulation of levels at the top of the inner and outer double fission barrier of {sup 237}Np.
ISSN:0556-2813
1089-490X
DOI:10.1103/PHYSREVC.74.034324