Core-excited states of CΛ12 hypernuclei formed in the (π+, K+) reaction

T. Hasegawa, O. Hashimoto, S. Homma, T. Miyachi, T. Nagae, M. Sekimoto, T. Shibata, H. Sakaguchi, T. Takahashi, K. Aoki, H. Noumi, H. Bhang, M. Youn, Y. Gavrilov, S. Ajimura, T. Kishimoto, A. Ohkusu, K. Maeda, R. Sawafta, R. P. Redwine

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57 Citations (Scopus)


A spectroscopic study of the CΛ12 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 C11 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.

Original languageEnglish
Pages (from-to)224-227
Number of pages4
JournalPhysical review letters
Issue number2
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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