Lifetime measurements of medium-heavy Λ hypernuclei

H. Park, H. Bhang, M. Youn, O. Hashimoto, Kazushige Maeda, Y. Sato, T. Takahashi, K. Aoki, Y. D. Kim, H. Noumi, K. Omata, H. Outa, M. Sekimoto, T. Shibata, T. Hasegawa, H. Hotchi, Y. Ohta, S. Ajimura, T. Kishimoto

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We have measured the lifetimes of the weak decay of 12ΛC, 28ΛSi, and 56ΛFe hypernuclei which were produced via a (π+,K+) reaction at KEK 12-GeV PS. The lifetimes were obtained by direct measurement of the production and decay time of the hypernucleus using a fast timing counter system whose time resolution was about 83 ps. Our results for the lifetimes of 12ΛC, 28ΛSi, and ΛFe are 231 ±15, 206±11, and 215±14 ps, respectively. The lifetimes of 11ΛB and 27ΛA1 with the application of the gate to the pΛ state of the formation spectra of 12ΛC and 28ΛSi were also determined to be 211±13 and 203±10 ps. From the present work, it was found that the total decay width saturates according to the hypernuclear mass number even at A∼12. This suggests the importance of the proper treatment of the short range nature of the nonmesonic decay of A hypernuclei.

Original languageEnglish
Article number054004
Pages (from-to)540041-5400411
Number of pages4860371
JournalPhysical Review C - Nuclear Physics
Issue number5
Publication statusPublished - 2000 Jan 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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