Nonmesonic decay of the Lambda hyperon in nuclear matter - implications on the weak Lambda-N interaction

Details Nonmesonic decay of the Lambda hyperon in nuclear matter - implications on the weak Lambda-N interaction Nonmesonic decay of the Lambda hyperon in nuclear matter - implications on the weak Lambda-N interaction

2001-09-17

arxiv.org/abs/nucl-ex/0109012v4

Eur.Phys.J.A16:549-561,2003

Physics

Nuclear Physics

Nuclear Experiment

21 pages, 11 PostScript figures, EPJA in print

Scientific paper

10.1140/epja/i2002-10131-8

The lifetime of the Lambda hyperon in heavy hypernuclei as measured by the COSY-13 Collaboration in proton - Au, Bi and U collisions has been analysed to yield tau(Lambda) = (145 +- 11) ps. This value for tau(Lambda) is compatible with the lifetime extracted from antiproton annihilation on Bi and U targets, however, much more accurate. We find that the dependence of the lifetime tau(Lambda) on the mass of hypernuclei indicates a violation of the phenomenological Delta I = 1/2 rule known from the weak mesonic decays of strange particles. PACS: {13.30.-a}{Decays of baryons} {13.75.Ev}{Hyperon-nucleon interaction} {21.80}{Hypernuclei} {25.80.Pw}{Hyperon-induced reactions}

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