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Phys. Rev. Lett. 74, 224–227 (1995)

Core-Excited States of Λ12C Hypernuclei Formed in the (π+, K+) reaction

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T. Hasegawa1, O. Hashimoto1, S. Homma1, T. Miyachi1, T. Nagae1, M. Sekimoto1, T. Shibata1, H. Sakaguchi2, T. Takahashi2, K. Aoki3, H. Noumi3, H. Bhang4, M. Youn4, Y. Gavrilov5, S. Ajimura6, T. Kishimoto6, A. Ohkusu6, K. Maeda7, R. Sawafta8, and R. P. Redwine9
1Institute for Nuclear Study (INS), University of Tokyo, Tanashi, Tokyo 188, Japan
2Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606, Japan
3National Laboratory for High Energy Physics (KEK), Oho, Tsukuba, Ibaraki 305 Japan
4Department of Physics, Seoul National University, Seoul 151-742, Korea
5Institute for Nuclear Research, Academy of Science, 117312 Moscow, Russia
6Department of Physics, Osaka University, Toyonaka, Osaka 660 Japan
7Department of Physics, Tohoku University, Kawauchi, Sendai, Miyagi 980-77 Japan
8Physics Department, Brookhaven National Laboratory, Upton, New York 11973
9Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Received 5 July 1994; revised 7 September 1994; published in the issue dated 9 January 1995

A spectroscopic study of the Λ12C hypernucleus by the (π+, K+) reaction has been performed using a new superconducting kaon spectrometer (INS-SKS) at the KEK 12 GeV Proton Synchrotron with an energy resolution of 2 MeV (FWHM). In addition to two prominent peaks which correspond to the s and p orbitals of a Λ hyperon, for the first time two smaller peaks were clearly observed at excitation energies of 2.6 and 6.9 MeV. These two peaks are interpreted as states where the 11C excited core and a Λ hyperon in the s orbit are weakly coupled. The excitation energies and the cross sections of these peaks provide information on the ΛN interaction.

© 1995 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.224
DOI:
10.1103/PhysRevLett.74.224
PACS:
21.80.+a, 25.80.Hp
 
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