Nota de FísicaPublicado
Level density parameter at the fission saddle point from intermediate-energy photofission cross-section data
O. A. P. Tavares; Emil de Lima Medeiros
2003
Dados da publicação
- Autores
- O. A. P. Tavares; Emil de Lima Medeiros
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 2003
- Descrição
- Nearly four hundred measured photofission cross-section values have been analysed in the framework of the current model for intermediate-energy photofission reactions to systematize the ratio $% r=a_{f}/a_{n}$ of level density parameter at the fission saddle point, $% a_{f} $, to that after neutron evaporation, $a_{n}$, of excited nuclides. The analysis covers twenty target nuclei extending from $^{27}$Al up to $% ^{237}$Np, most of the photofission cross sections of which have been measured in the range $\sim$40--130 MeV at different laboratories during the last fifty years or so. The $r$-values could be parametrized according to $% r = 1+p/E^{\ast ^{q }}$, where $E^{\ast }$ is the excitation energy, and $% p>0 $ and $q\geq 0$ are parameters which depend upon the quantity $Z^{2}/A$.
- Ano
- 2003
- Número
- CBPF-NF-050/03
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não