1. Missing-mass spectroscopy with the ${}^{6}$Li($��^{-}, K^{+}$)X reaction to search for ${}^{6}_��$H
- Author
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Honda, R., Agnello, M., Ahn, J. K., Ajimura, S., Akazawa, Y., Amano, N., Aoki, K., Bhang, H. C., Chiga, N., Endo, M., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Fukuda, T., Hasegawa, S., Hayakawa, S. H., Hosomi, K., Hwang, S. H., Ichikawa, Y., Igarashi, Y., Imai, K., Ishibashi, N., Iwasaki, R., Joo, C. W., Kiuchi, R., Lee, J. K., Lee, J. Y., Matsuda, K., Matsumoto, Y., Matsuoka, K., Miwa, K., Mizoi, Y., Moritsu, M., Nagae, T., Nagamiya, S., Nakagawa, M., Naruki, M., Noumi, H., Ota, R., Roy, B. J., Saha, P. K., Sakaguchi, A., Sako, H., Samanta, C., Samoilov, V., Sasaki, Y., Sato, S., Sekimoto, M., Shimizu, Y., Shiozaki, T., Shirotori, K., Soyama, T., Sugimura, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanabe, K., Tanaka, T., Tanida, K., Tokiyasu, A. O., Tsamalaidze, Z., Ukai, M., Yamamoto, T. O., Yamamoto, Y., Yang, S. B., and Yoshida, K.
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Nuclear Theory (nucl-th) ,FOS: Physical sciences ,Nuclear Experiment (nucl-ex) - Abstract
We searched for the bound state of the neutron-rich $��$-hypernucleus ${}^{6}_��$H, using the ${}^{6}$Li($��^{-}, K^{+}$)X double charge-exchange reaction at a $��^{-}$ beam momentum of 1.2 GeV/c at J-PARC. A total of $1.4 \times 10^{12}$ $��^{-}$ was driven onto a ${}^{6}$Li target of 3.5-g/$\rm cm^2$ thickness. No event was observed below the bound threshold, i.e., the mass of ${}^{4}_��$H + 2n, in the missing-mass spectrum of the ${}^{6}$Li($��^{-}, K^{+}$)X reaction in the $2^{\circ}$ < $��_{��K}$ < $20^{\circ}$ angular range. Furthermore, no event was found up to 2.8 MeV/$c^2$ above the bound threshold. We obtained the the double-differential cross section spectra of the ${}^{6}$Li($��^{-}, K^{+}$)X reaction in the angular range of $2^{\circ}$ < $��_{��K}$ < $14^{\circ}$. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the ${}^{6}_��$H hypernucleus bound state. In addition, not only the bound state region, but also the $��$ continuum region and part of the $��^{-}$ quasi-free production region of the ${}^{6}$Li($��^{-}, K^{+}$)X reaction, were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the $��^{-}$-nucleus optical potential for $��^{-}$-${}^{5}$He through spectrum shape analysis., 24 pages, 17 figures
- Published
- 2017
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