Data di Pubblicazione:
2003
Citazione:
Many-body approach to proton emission and the role of spectroscopic factors / J. Al-Khalili, C. Barbieri, J. Escher, B.K. Jennings, J.-. Sparenberg. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 68:2(2003), pp. 024314.1-024314.10.
Abstract:
The process of proton emission from nuclei is studied by utilizing the two-potential approach of Gurvitz and Kalbermann in the context of the full many-body problem. A time-dependent approach is used for calculating the decay width. Starting from an initial many-body quasistationary state, we employ the Feshbach projection operator approach and reduce the formalism to an effective one-body problem. We show that the decay width can be expressed in terms of a one-body matrix element multiplied by a normalization factor. We demonstrate that the traditional interpretation of this normalization as the square root of a spectroscopic factor is only valid for one particular choice of projection operator. This causes no problem for the calculation of the decay width in a consistent microscopic approach, but it leads to ambiguities in the interpretation of experimental results. In particular, spectroscopic factors extracted from a comparison of the measured decay width with a calculated single-particle width may be affected.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
alpha-decay; nuclear reactions; unified theory; shell-model; widths
Elenco autori:
J. Al-Khalili, C. Barbieri, J. Escher, B.K. Jennings, J.-. Sparenberg
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