First Determination of the Level Structure of an sd -Shell Hypernucleus, F Λ19

S. B. Yang, J. K. Ahn, Y. Akazawa, K. Aoki, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, M. Fujita, S. Hasegawa, S. Hayakawa, T. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, N. Ichige, Y. Ichikawa, M. Ikeda, K. Imai, S. IshimotoS. Kanatsuki, S. H. Kim, S. Kinbara, K. Kobayashi, T. Koike, J. Y. Lee, K. Miwa, T. J. Moon, T. Nagae, Y. Nakada, M. Nakagawa, Y. Ogura, A. Sakaguchi, H. Sako, Y. Sasaki, S. Sato, K. Shirotori, H. Sugimura, S. Suto, S. Suzuki, T. Takahashi, H. Tamura, K. Tanida, Y. Togawa, Z. Tsamalaidze, M. Ukai, T. F. Wang, T. O. Yamamoto

研究成果: Article査読

8 被引用数 (Scopus)

抄録

We report on the first observation of γ rays emitted from an sd-shell hypernucleus, FΛ19. The energy spacing between the ground state doublet, 1/2+ and 3/2+ states, of FΛ19 is determined to be 315.5±0.4(stat)-0.5+0.6(syst) keV by measuring the γ-ray energy of the M1(3/2+→1/2+) transition. In addition, three γ-ray peaks are observed and assigned as E2(5/2+→1/2+), E1(1/2-→1/2+), and E1(1/2-→3/2+) transitions. The excitation energies of the 5/2+ and 1/2- states are determined to be 895.2±0.3(stat)±0.5(syst) and 1265.6±1.2(stat)-0.5+0.7(syst) keV, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing s- and p-shell hypernuclear data.

本文言語English
論文番号132505
ジャーナルPhysical review letters
120
13
DOI
出版ステータスPublished - 2018 3 29

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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