Nonmesonic decay of the Lambda-hyperon in hypernuclei produced by p+Au   collisions
  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} 
B. Kamys (1), P. Kulessa (2), H. Ohm (2), K. Pysz (3), Z.Rudy (1), H.   Stroeher (2), W. Cassing (4) ((1) M. Smoluchowski In...