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Nonmesonic decay of the Λ-hyperon in hypernuclei produced by p + Au collisions

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Abstract:

The lifetime of the Λ-hyperon for the nonmesonic decay ΛN → NN has been determined by a measurement at COSY Jülich 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 τΛ = 130±13 (stat.) ±15 (syst.) ps. 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 ΔI = 1/2 rule for the ΛN → NN transitions as known from the weak mesonic decays of kaons and hyperons.

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Authors and Affiliations

  1. M. Smoluchowski Institute of Physics, Jagellonian University, PL-30059 Cracow, Poland, , , , , , PL

    B. Kamys & Z. Rudy

  2. Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany, , , , , , DE

    P. Kulessa, H. Ohm & H. Ströher

  3. H. Niewodniczański Institute of Nuclear Physics, PL-31342 Cracow, Poland, , , , , , PL

    K. Pysz

  4. Institut für Theoretische Physik, Justus Liebig Universität Giessen, D-35392 Giessen, Germany, , , , , , DE

    W. Cassing

Authors
  1. B. Kamys
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  2. P. Kulessa
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  3. H. Ohm
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  4. K. Pysz
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  5. Z. Rudy
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  6. H. Ströher
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  7. W. Cassing
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Received: 20 November 2000 / Accepted: 14 May 2001

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Kamys, B., Kulessa, P., Ohm, H. et al. Nonmesonic decay of the Λ-hyperon in hypernuclei produced by p + Au collisions. Eur Phys J A 11, 1–4 (2001). https://doi.org/10.1007/s100500170089

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  • DOI: https://doi.org/10.1007/s100500170089

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