Nota de FísicaPublicado
Systematics of half-lives for proton radioactivity
E. L. Medeiros; M. M. N. Rodrigues; S. B. Duarte
Dados da publicação
- Autores
- E. L. Medeiros; M. M. N. Rodrigues; S. B. Duarte
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 07/01/2008
- Descrição
- Half-life measurements for both ground-state and isomeric transitions in proton radioactivity are systematized by using a semiempirical, one-parameter model based on tunneling through a potential barrier, where the centrifugal and overlapping effects are taken into account within the spherical nucleus approximation. This approach, which has been successfully applied to alpha decay cases covering $\sim 30$ orders of magnitude in half-life, has shown, in addition, very adequate at fitting all existing data on partial half-life, $\phl$, of proton emission from nuclei. Nearly 70 measured half-life values have been analysed, and the data could be described by two straight lines relating the pure Coulomb contribution to half-life with the quantity $Z_{\sf d}(\mu_0/Q_{\sf p})^{1/2}$ ($Z_{\sf d}$ is the atomic number of the daughter nucleus, $\mu_0$ is the reduced mass, and $Q_{\sf p}$ is the total nuclear energy available for decay). These straight lines are shown to correspond to different degrees of deformation, namely, very prolate ($\delta\gtrsim 0.1$), and other shaped ($\delta\lesssim 0.1$) parent nuclei. The goodness in reproducing the data attained in the present systematics allows for half-life predictions for a few possible cases of proton radioactivity not yet experimentally accessed.
- Ano
- 2007
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não