Core-Excited States of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><mrow><mi>Λ</mi></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> Hypernuclei Formed in the (<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mo>,</mo><mi> </mi><mrow><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math></span>) 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

doi:10.1103/PhysRevLett.74.224

Core-Excited States of ${}_{Λ}^{12}C$ 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, and R. P. Redwine

Phys. Rev. Lett. 74, 224 – Published 9 January 1995

Abstract

A spectroscopic study of the ${}_{Λ}^{12}C$ 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 ${}^{11}C$ 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 $Λ N$ interaction.

Received 5 July 1994

DOI:https://doi.org/10.1103/PhysRevLett.74.224

Authors & Affiliations

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