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Phys. Rev. Lett. 81, 4321–4324 (1998)

Lifetime Measurement of Λ12C, Λ28Si, and ΛFe Hypernuclei

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H. Bhang1, S. Ajimura5, K. Aoki3, T. Hasegawa4,*, O. Hashimoto2, H. Hotchi4, Y. D. Kim1,3,†, T. Kishimoto5, K. Maeda2, H. Noumi3, Y. Ohta4, K. Omata3, H. Outa3, H. Park1, Y. Sato2, M. Sekimoto3, T. Shibata3, T. Takahashi2, and M. Youn1,2,‡
1Department of Physics, Seoul National University, Seoul 151-742, Korea
2Physics Department, Tohoku University, Sendai 980-8578, Japan
3High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
4Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
5Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

Received 27 July 1998; published in the issue dated 16 November 1998

We have measured lifetimes of Λ hypernuclei over a broad mass range explicitly identifying Λ hypernuclear production in the (π+,K+) reaction. The obtained results are τ(Λ12C) = 231±15 ps, τ(Λ28Si) = 206±12 ps, and τ(ΛFe) = 215±14 ps. The lifetimes of Λ hypernuclei over the mass region from carbon to iron are found almost constant at about 80% of that of free Λ within the statistical uncertainties. The short-range nature of the nonmesonic weak decay process, which is dominant in heavy Λ hypernuclei, is possibly responsible for the observed weak hypernuclear mass dependence.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.4321
DOI:
10.1103/PhysRevLett.81.4321
PACS:
21.80.+a, 13.30.Eg, 13.75.Ev, 21.10.Tg

*Present address: School of Allied Health Sciences, Kitasato University, Sagamihara 228-8555, Japan.

†Present address: Department of Physics, Sejong University, Seoul 143-747, Korea.

‡Present address: University of Houston, Houston, Texas 77004.

 
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