A further study of the FINUDA data about non-mesonic weak decay of eight Λ-hypernuclei in the A range (5 – 16) was carried out. New values of the ratio between the two-nucleon and the one-proton induced decay widths, Γ2N /Γp, were determined from single proton spectra, Γ2N /Γp = 0.50 ± 0.24, and from neutron and proton coincidence spectra, Γ /Γ 2N p A further study of the FINUDA data about non-mesonic weak decay of eight Λ-hypernuclei in the A range (5 – 16) was carried out. New values of the ratio between the two-nucleon and the one-proton induced decay widths, Γ2N /Γp, were determined from single proton spectra, Γ2N /Γp = 0.50 ± 0.24, and from neutron and proton coincidence spectra, Γ /Γ 2N p= 0.36 ± 0.14 +0.05sys , in full agreement stat −0.04sys with the previously published ones. Starting from these values, a method was 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 measured quantities only and by assuming a linear dependence on A of the effects due to Final State Interaction. The present work is the first systematic Γp/ΓΛ determination ever done and it agrees with recent theoretical predictions within the errors.

First Experimental Determination of the One-Proton Induced Non-Mesonic Weak Decay Width forp-shell Λ-hypernuclei

BOTTA, Elena;BRESSANI, Tullio;BUFALINO, STEFANIA;DE MORI, FRANCESCA;MARCELLO, Simonetta;
2015-01-01

Abstract

A further study of the FINUDA data about non-mesonic weak decay of eight Λ-hypernuclei in the A range (5 – 16) was carried out. New values of the ratio between the two-nucleon and the one-proton induced decay widths, Γ2N /Γp, were determined from single proton spectra, Γ2N /Γp = 0.50 ± 0.24, and from neutron and proton coincidence spectra, Γ /Γ 2N p A further study of the FINUDA data about non-mesonic weak decay of eight Λ-hypernuclei in the A range (5 – 16) was carried out. New values of the ratio between the two-nucleon and the one-proton induced decay widths, Γ2N /Γp, were determined from single proton spectra, Γ2N /Γp = 0.50 ± 0.24, and from neutron and proton coincidence spectra, Γ /Γ 2N p= 0.36 ± 0.14 +0.05sys , in full agreement stat −0.04sys with the previously published ones. Starting from these values, a method was 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 measured quantities only and by assuming a linear dependence on A of the effects due to Final State Interaction. The present work is the first systematic Γp/ΓΛ determination ever done and it agrees with recent theoretical predictions within the errors.
Second International Symposium on Science at J-PARC
Tsukuba Japan
July 12-15 2014
8
021001
021001
DAΦNE, FINUDA experiment, p-shell Λ-hypernuclei, non-mesonic weak decay
Agnello, M.; Benussi, L.; Bertani, M.; Bhang, H. C.; Bonomi, G.; Botta, E.; Bressani, T.; Bufalino, S.; Calvo, D.; Camerini, P.; Dalena, B.; De Mori, F.; D’Erasmo, G.; Feliciello, A.; Filippi, A.; Fujioka, H.; Gianotti, P.; Grion, N.; Lucherini, V.; Marcello, S.; Nagae, T.; Outa, H.; Paticchio, V.; Piano, S.; Rui, R.; Simonetti, G.; Zenoni, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1526046
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