Observation of Coulomb-assisted nuclear bound state of $\Xi^-$-$^{14}$N   system

S.H. Hayakawa (1); K. Agari (2); J. K. Ahn (3); T. Akaishi (4); Y.; Akazawa (2); S. Ashikaga (1; 5); B. Bassalleck (6); S. Bleser (7); H.; Ekawa (8); Y. Endo (9); Y. Fujikawa (5); N. Fujioka (10); M. Fujita (1); R.; Goto (9); Y. Han (11); S. Hasegawa (1); T. Hashimoto (1); T. Hayakawa (4); E.; Hayata (5); K. Hicks (12); E. Hirose (2); M. Hirose (5); R. Honda (2); K.; Hoshino (9); S. Hoshino (4); K. Hosomi (1); S. H. Hwang (13); Y. Ichikawa; (1); M. Ichikawa (5; 14); K. Imai (1); K. Inaba (5); Y. Ishikawa (10); H.; Ito (9); K. Ito (15); W. S. Jung (3); S. Kanatsuki (5); H. Kanauchi (10); A.; Kasagi (8; 16); T. Kawai (17); M. H. Kim (3); S. H. Kim (3); S. Kinbara; (16); R. Kiuchi (18); H. Kobayashi (9); K. Kobayashi (4); T. Koike (10); A.; Koshikawa (5); J. Y. Lee (19); T. L. Ma (20); S. Y. Matsumoto (5; 14); M.; Minakawa (2); K. Miwa (10); A. T. Moe (21); T. J. Moon (19); M. Moritsu (2),; Y. Nagase (9); Y. Nakada (4); M. Nakagawa (8); D. Nakashima (9); K. Nakazawa; (9; 16); T. Nanamura (1; 5); M. Naruki (1; 5); A. N. L. Nyaw (16),; Y. Ogura (10); M. Ohashi (9); K. Oue (4); S. Ozawa (10); J. Pochodzalla (7; and 22); S. Y. Ryu (23); H. Sako (1); S. Sato (1); Y. Sato (2); F. Schupp; (7); K. Shirotori (23); M. M. Soe (24); M. K. Soe (16); J. Y. Sohn (25); H.; Sugimura (26); K. N. Suzuki (5); H. Takahashi (2); T. Takahashi (2); T.; Takeda (5); H. Tamura (1; 10); K. Tanida (1); A. M. M. Theint (16); K. T.; Tint (9); Y. Toyama (10); M. Ukai (2; 10); E. Umezaki (5); T. Watabe (15),; K. Watanabe (5); T. O. Yamamoto (1); S. B. Yang (3); C. S. Yoon (25); J.; Yoshida (8; 10); M. Yoshimoto (9); D. H. Zhang (20); Z. Zhang (20) ((1); Advanced Science Research Center; Japan Atomic Energy Agency; Tokai; Japan,; (2) Institute of Particle; Nuclear Studies; High Energy Accelerator; Research Organization (KEK); Tsukuba; Japan; (3) Department of Physics; Korea; University; Seoul; Korea; (4) Department of Physics; Osaka University,; Toyonaka; Japan; (5) Department of Physics; Kyoto University; Kyoto; Japan,; (6) Department of Physics; Astronomy; University of New Mexico,; Albuquerque; New Mexico; USA; (7) Helmholtz Institute Mainz; Mainz; Germany,; (8) High Energy Nuclear Physics Laboratory; RIKEN; Wako; Japan; (9) Faculty; of Education; Gifu University; Gifu; Japan; (10) Department of Physics,; Tohoku University; Sendai; Japan; (11) Institute of Nuclear Energy Safety; Technology; Hefei Institutes of Physical Science; Chinese Academy of; Sciences; Hefei; China; (12) Department of Physics; Astronomy; Ohio; University; Athens; Ohio; USA; (13) Korea Research Institute of Standards and; Science; Daejeon; Korea; (14) Meson Science Laboratory; RIKEN; Wako; Japan,; (15) Department of Physics; Nagoya University; Nagoya; Japan; (16) Graduate; School of Engineering; Gifu University; Gifu; Japan; (17) Center for Advanced; Photonics; RIKEN; Wako; Japan; (18) Institute of High Energy Physics,; Beijing; China; (19) Department of Physics; Seoul National University; Seoul,; Korea; (20) Institute of Modern Physics; Shanxi Normal University; Linfen,; China; (21) Department of Physics; Lashio University; Lashio; Myanmar; (22); Institut fur Kernphysik; Johannes Gutenberg-Universitat; Mainz; Germany; (23); Research Center for Nuclear Physics; Osaka University; Osaka; Japan; (24); Department of Physics; University of Yangon; Yangon; Myanmar; (25) Research; Institute of Natural Science; Gyeongsang National University; Jinju; Korea,; (26) Accelerator Laboratory; High Energy Accelerator Research Organization; (KEK); Tsukuba; Japan)

arXiv:2010.14317·nucl-ex·February 17, 2021

Observation of Coulomb-assisted nuclear bound state of $\Xi^-$-$^{14}$N system

S.H. Hayakawa (1), K. Agari (2), J. K. Ahn (3), T. Akaishi (4), Y., Akazawa (2), S. Ashikaga (1, 5), B. Bassalleck (6), S. Bleser (7), H., Ekawa (8), Y. Endo (9), Y. Fujikawa (5), N. Fujioka (10), M. Fujita (1), R., Goto (9), Y. Han (11), S. Hasegawa (1), T. Hashimoto (1)

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TL;DR

This paper reports the first observation of a Coulomb-assisted nuclear bound state involving a Xi-minus hyperon and nitrogen-14, identified through a unique hypernuclear reaction in a J-PARC experiment.

Contribution

It provides the first experimental evidence of a Coulomb-assisted bound state of a Xi-minus hyperon with nitrogen-14, with a measured binding energy and insights into the hyperon’s energy level.

Findings

01

Measured binding energy of 1.27 ± 0.21 MeV for the Xi- in the system.

02

Identified the reaction process as Xi- + 14N → 10LambdaBe + 5LambdaHe.

03

Indicates a weak Xi-N to Lambda-Lambda coupling based on energy level analysis.

Abstract

In an emulsion-counter hybrid experiment performed at J-PARC, a $Ξ^{-}$ absorption event was observed which decayed into twin single- $Λ$ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as $Ξ^{-} +^{14}$ N $\to_{Λ}^{10}$ Be + $_{Λ}^{5}$ He. For the binding energy of the $Ξ^{-}$ hyperon in the $Ξ^{-}$ - $^{14}$ N system a value of $1.27 \pm 0.21$ MeV was deduced. The energy level of $Ξ^{-}$ is likely a nuclear $1 p$ state which indicates a weak $Ξ N$ - $ΛΛ$ coupling.

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