Proton spectra from Non-Mesonic Weak Decay of pshell Lambda-Hypernuclei and evidence for the two-nucleon induced process

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Abstract

New spectra from the FINUDA experiment of the Non-Mesonic Weak Decay (NMWD) proton kinetic energy for 9 ΛBe, 11 Λ B, 12 Λ C, 13 Λ C, 15 Λ N and 16 Λ O are presented and discussed along with the published data on 5 ΛHe and 7 ΛLi. Exploiting the large mass number range and the low energy threshold (15 MeV) for the proton detection of FINUDA, an evaluation of both Final State Interactions (FSI) and the two-nucleon induced NMWD contributions to the decay process has been done. Based on this evaluation, a linear dependence of FSI on the hypernuclear mass number A is found and for the two-nucleon stimulated decay rate the experimental value of Γ2/Γp = 0.43 ± 0.25 is determined for the first time. A value for the two-nucleon stimulated decay rate to the total decay rate Γ2/ΓNMWD = 0.24±0.10 is also extracted.

Autore Pugliese

Tutti gli autori

  • FIORE E.M.

Titolo volume/Rivista

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Anno di pubblicazione

2010

ISSN

0370-2693

ISBN

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Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

40

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Settori ERC

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Codici ASJC

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