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

CAMERINI, Paolo;PIANO, STEFANO;RUI, RINALDO;
2014-01-01

Abstract

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2816727
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