Nonmesonic decay of the Lambda hyperon in nuclear matter - implications on the weak Lambda-N interaction
核实验
2009-03-20 v4
摘要
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}
引用
@article{arxiv.nucl-ex/0109012,
title = {Nonmesonic decay of the Lambda hyperon in nuclear matter - implications on the weak Lambda-N interaction},
author = {W. Cassing and L. Jarczyk and B. Kamys and P. Kulessa and H. Ohm and K. Pysz and Z. Rudy and O. W. B. Schult and H. Stroeher},
journal= {arXiv preprint arXiv:nucl-ex/0109012},
year = {2009}
}
备注
21 pages, 11 PostScript figures, EPJA in print