Microscopic approach to nucleon spectra in hypernuclear non-mesonic weak decay |
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Authors: | E Bauer G Garbarino |
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Institution: | 1. Departamento de Física, Universidad Nacional de La Plata and IFLP, CONICET C.C. 67, 1900 La Plata, Argentina;2. Dipartimento di Fisica Teorica, Università di Torino, I-10125 Torino, Italy |
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Abstract: | A consistent microscopic diagrammatic approach is applied for the first time to the calculation of the nucleon emission spectra in the non-mesonic weak decay of Λ-hypernuclei. We adopt a nuclear matter formalism extended to finite nuclei via the local density approximation, a one-meson exchange weak transition potential and a Bonn nucleon–nucleon strong potential. Ground state correlations and final state interactions, at second order in the nucleon–nucleon interaction, are introduced on the same footing for all the isospin channels of one- and two-nucleon induced decays. Single and double-coincidence nucleon spectra are predicted for 12ΛC and compared with recent KEK and FINUDA data. The key role played by quantum interference terms allows us to improve the predictions obtained with intranuclear cascade codes. Discrepancies with data remain for proton emission. |
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Keywords: | Λ-hypernuclei Non-mesonic weak decay Two-nucleon induced decay FSI |
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