First determination of the one-proton induced Non-Mesonic Weak Decay width of p-shell Λ-Hypernuclei
oleh: M. Agnello, L. Benussi, M. Bertani, H.C. Bhang, G. Bonomi, E. Botta, T. Bressani, S. Bufalino, D. Calvo, P. Camerini, B. Dalena, F. De Mori, G. D'Erasmo, A. Feliciello, A. Filippi, H. Fujioka, P. Gianotti, N. Grion, V. Lucherini, S. Marcello, T. Nagae, H. Outa, V. Paticchio, S. Piano, R. Rui, G. Simonetti, A. Zenoni
| Format: | Article |
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| Diterbitkan: | Elsevier 2014-11-01 |
Deskripsi
Previous studies of proton and neutron spectra from Non-Mesonic Weak Decay of eight Λ-Hypernuclei (A=5–16) have been revisited. New values of the ratio of the two-nucleon and the one-proton induced decay widths, Γ2N/Γp, are obtained from single proton spectra, Γ2N/Γp=0.50±0.24, and from neutron and proton coincidence spectra, Γ2N/Γp=0.36±0.14stat−0.04sys+0.05sys, in full agreement with previously published ones. With these values, a method is developed to extract the one-proton induced decay width in units of the free Λ decay width, Γp/ΓΛ, without resorting to Intra Nuclear Cascade models but by exploiting only experimental data, under the assumption of a linear dependence on A of the Final State Interaction contribution. This is the first systematic determination ever done and it agrees within the errors with recent theoretical calculations. Keywords: Λ-Hypernuclei, Two-nucleon and proton-induced Non-Mesonic Weak Decay width