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28 March 2024
 
  » arxiv » hep-ex/0011063

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Nonmesonic decay of the Lambda-hyperon in hypernuclei produced by p+Au collisions
B. Kamys ; P. Kulessa ; H. Ohm ; K. Pysz ; Z.Rudy ; H. Stroeher ; W. Cassing ;
Date 19 Nov 2000
Journal Eur.Phys.J. A11 (2001) 1-4
Subject hep-ex nucl-ex
Affiliation M. Smoluchowski Institute of Physics, Jagellonian University, Cracow, Poland, Institut fuer Kernphysik, Forschungszentrum Juelich, Germany, H. Niewodniczanski Institute of Nuclear Physics, Cracow, Poland, Institut fuer Theoretische Physik, Justus
AbstractThe 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}
Source arXiv, hep-ex/0011063
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