EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 5, 127-129

Short note

On the $\Delta$I=1/2 rule in the $\Lambda$N$\rightarrow$NN reaction

Z. Rudy1 - W. Cassing2 - L. Jarczyk1 - B. Kamys1 - P. Kulessa1,3 - O.W.B. Schult3 - A. Strza\l kowski1

1 M. Smoluchowski Institute of Physics, Jagellonian University, PL-30059 Cracow, Poland
2 Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany
3 Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany

Received: 31 March 1999 Communicated by B. Povh

Abstract
It is shown that the mass dependence of the $\Lambda$-lifetime in heavy hypernuclei is sensitive to the ratio of neutron-induced to proton-induced non-mesonic decay rates Rn/Rp. A comparison of the experimental mass dependence of the lifetimes with the calculated ones for different values of Rn/Rp leads to the conclusion that this ratio is larger than 2 on the confidence level of 0.75. This suggests that the phenomenological $\Delta$I=1/2 rule might be violated for the nonmesonic decay of the $\Lambda$-hyperon.

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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