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

S. B. Yang, Jung Keun 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

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Abstract

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.

Original languageEnglish
Article number132505
JournalPhysical Review Letters
Volume120
Issue number13
DOIs
Publication statusPublished - 2018 Mar 29

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yang, S. B., Ahn, J. K., Akazawa, Y., Aoki, K., Chiga, N., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujita, M., Hasegawa, S., Hayakawa, S., Hayakawa, T., Honda, R., Hosomi, K., Hwang, S. H., Ichige, N., Ichikawa, Y., Ikeda, M., Imai, K., ... Yamamoto, T. O. (2018). First Determination of the Level Structure of an sd -Shell Hypernucleus, F Λ19. Physical Review Letters, 120(13), [132505]. https://doi.org/10.1103/PhysRevLett.120.132505