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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 | Abstract: | 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} | Source: | arXiv, hep-ex/0011063 | Services: | Forum | Review | PDF | Favorites |
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