pi^- decay rates of p-shell hypernuclei revisited

Details pi^- decay rates of p-shell hypernuclei revisited pi^- decay rates of p-shell hypernuclei revisited

2009-04-07

arxiv.org/abs/0904.1174v4

Nucl.Phys.A828:72-83,2009

Physics

Nuclear Physics

Nuclear Theory

published version; new footnote 2 added in proof; related to recent FINUDA data, arXiv:0905.0623 [nucl-ex] submitted to Phys.

Scientific paper

10.1016/j.nuclphysa.2009.06.026

Explicit expressions for the parity-violating s-wave and the parity-conserving p-wave contributions to pi- weak-decay rates of Lambda hypernuclei in the 1p shell are given in the weak-coupling limit, to update previous shell-model calculations and to compare with recent pi- spectra and total decay rates measured by the FINUDA Collaboration. A useful sum rule for the summed strength of Lambda_{1s} --> pi- + proton_{1p} weak decays is derived. Fair agreement between experiment and calculations is reached, using the primary s-wave amplitude and Cohen-Kurath nuclear wavefunctions. The role of the p-wave amplitude is studied in detail for Lambda-15N and found to be secondary. Previous assignments of ground-state spin-parity values are confirmed and a new assignment is made, spin-parity 3/2+ for Lambda-15N, based on the substantial suppression calculated here for spin-parity 1/2+.

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