Nota de FísicaPublicado
Fission of Complex Nuclei Induced by 52-MeV Monochromatic and Polarized Photons
O. A. P. Tavares; M. L. Terranova; L. Casano; A. D Angelo; D. Moricciani; C. Schaerf; D. Babusci; B. Girolami; J. B. Martins; E. L. Moreira; J. L. Vieira
1991
Dados da publicação
- Autores
- O. A. P. Tavares; M. L. Terranova; L. Casano; A. D Angelo; D. Moricciani; C. Schaerf; D. Babusci; B. Girolami; J. B. Martins; E. L. Moreira; J. L. Vieira
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 1991
- Descrição
- Experimental fissility data from photofission reactions of <math>^{232}Th\,\!</math>, <math>^{238}U\,\!</math>, and <math>^{235}U\,\!</math> nuclei at <math>52 MeV\,\!</math> have been obtained using monochromatic and polarized LADON photon beams and dielectric fission-track detectors. These data, along with literature data for <math>^{237}Np\,\!</math>,<math> ^{235},^{238}U, ^{232}Th, ^{209}Bi, ^{208}pb\,\!</math> and <math>^{174}Yb\,\!</math> nuclei have been analysed within the framework of a simple two-step model for photofission reactions, i.e.,absorption of the incident photon by a neutron-proton pair followed by an evaporation-fission competition mechanism for the excited nucleus. Estimated fissility for nuclei in the Ta - Np region clearly evidentiates shell effects in the vicinity of <math>^{208}Pb\,\!</math> . In the case of <math>^{238}U\,\!</math> the effect of photon polarization on fission direction has been also studied, and isotropy was observed in the fragment azimuthal distribution.
- Ano
- 1991
- Número
- CBPF-NF-027/91
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não