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Phys. Rev. Lett. 80, 3471 - 3474 (1998)

Polarization of Λ5He Produced by the (π+,K+) Reaction

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S. Ajimura, M. Ishikawa, K. Ikeda, T. Kishimoto, A. Okusu, N. Shinkai, and Y. Tanaka
Department of Physics, Osaka University, Toyonaka, Osaka 560, Japan

H. Ejiri and T. Nakano
Research Center for Nuclear Physics, Osaka University, Suita, Osaka 564, Japan

T. Nagae, H. Noumi, K. Manabe, M. Sekimoto, and T. Shibata
High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305, Japan

O. Hashimoto, K. Maeda, and T. Takahashi
Department, of Physics, Tohoku University, Sendai, Miyagi, Japan

T. Hasegawa
School of Hygienic Science, Kitazato University, Sagamihara, Kanagawa 228, Japan

H. Bhang, H. Park, Y. Kim, and M. Youn
Department of Physics, Seoul National University, Seoul, Korea

T. Motoba
Laboratory of Physics, Osaka Electro-Communication University, Neyagawa, Osaka 572, Japan

K. Itonaga
Laboratory of Physics, Miyazaki Medical College, Miyazaki 889-16, Japan

Received 18 November 1997

We have measured the polarization of Λ5He produced by the (π+,K+) reaction for the first time by observing the asymmetric emission of its weak decay pions. The large asymmetry parameter of the mesonic decay, which is unique to Λ5He, made the measurement possible. The measurement is consistent with the theoretical prediction by which the mechanism of the hypernuclear polarization was clarified. This technique will open a new field to the spectroscopic study of hypernuclei.


©1998 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.80.3471
DOI: 10.1103/PhysRevLett.80.3471
PACS: 21.80.+a, 24.70.+s, 25.80.Hp, 27.10.+h

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