Mesonic and nonmesonic weak decay widths of medium-heavy lambda hypernuclei

Details Mesonic and nonmesonic weak decay widths of medium-heavy lambda hypernuclei Mesonic and nonmesonic weak decay widths of medium-heavy lambda hypernuclei

2004-09-12

arxiv.org/abs/nucl-ex/0409007v2

Physical Review C71, 025203 (2005)

Physics

Nuclear Physics

Nuclear Experiment

28 pages, 11 figures, Published in Physical Review C

Scientific paper

10.1103/PhysRevC.71.025203

We have measured the energy spectra of pions and protons emitted in the weak decay of 12_Lambda_C, 28_Lambda_Si, and Lambda_Fe hypernuclei produced via the (pi+, K+) reaction. The decay widths of the pi- mesonic decay (Lambda -> p + pi-) and the nonmesonic decay (Lambda + N -> N + N) were extracted. The present results demonstrate an increase of the mesonic decay width due to a distortion of the pion wave function in nuclear medium for the first time. The ratios of the neutron- to proton-induced nonmesonic decay widths, Gamma_n(Lambda + n -> n + n)/Gamma_p(Lambda + p -> n + p), were evaluated by a direct comparison of the measured proton energy spectra with the calculated ones. No theoretical calculation which has been proposed so far can simultaneously account for both the nonmesonic decay widths and the Gamma_n/Gamma_p ratios in the present data.

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