First determination of the one-proton induced Non-Mesonic Weak Decay width of p-shell Λ-Hypernuclei

Agnello, M.; Benussi, L.; Bertani, M.; Bhang, H. C.; Bonomi, G.; Botta, E.; Bressani, T.; Bufalino, S.; Calvo, D.; Camerini, Paolo; 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, Stefano; Rui, Rinaldo; Simonetti, G.; Zenoni, A.

doi:10.1016/j.physletb.2014.10.024

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, View the MathML source, 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.

First determination of the one-proton induced Non-Mesonic Weak Decay width of p-shell Λ-Hypernuclei / M., Agnello; L., Benussi; M., Bertani; H. C., Bhang; G., Bonomi; E., Botta; T., Bressani; S., Bufalino; D., Calvo; Camerini, Paolo; 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; Piano, Stefano; Rui, Rinaldo; G., Simonetti; A., Zenoni. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 2014:738(2014), pp. 499-504. [10.1016/j.physletb.2014.10.024]