| Autor: |
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, Ishimoto, S, 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 |
| Rok vydání: |
2018 |
| Zdroj: |
Physical review letters. 120(13) |
| ISSN: |
1079-7114 |
| Popis: |
We report on the first observation of γ rays emitted from an sd-shell hypernucleus, _{Λ}^{19}F. The energy spacing between the ground state doublet, 1/2^{+} and 3/2^{+} states, of _{Λ}^{19}F 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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