Nonmesonic decay of the Lambda-hyperon in hypernuclei produced by p+Au collisions

Details Nonmesonic decay of the Lambda-hyperon in hypernuclei produced by p+Au collisions Nonmesonic decay of the Lambda-hyperon in hypernuclei produced by p+Au collisions

2000-11-19

arxiv.org/abs/hep-ex/0011063v1

Eur.Phys.J. A11 (2001) 1-4

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, 2 Postscript figures, uses svepj.clo and svjour.cls. submitted to European Physical Journal A

Scientific paper

10.1007/s100500170089

The lifetime of the Lambda-hyperon for the nonmesonic decay Lambda N ---> N N has been determined by a measurement at COSY Juelich of the delayed fission of heavy hypernuclei produced in proton - Au collisions at T_p=1.9 GeV. It is found that heavy hypernuclei with mass numbers A= 180 +- 5 and atomic numbers Z= 74 +-2 fission with a lifetime 130ps +- 13ps (stat.) +- 15ps (syst.) . This value together with the results obtained for other heavy hypernuclei in previous investigations indicates (on the confidence level of 0.9) a violation of the phenomenological Delta I = 1/2 rule for Lambda N ---> NN transitions as known from the weak mesonic decays of kaons and hyperons. 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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