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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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

Bibliographical note

Funding Information:
We thank the J-PARC accelerator and facility staff and all the project members who participated in the development of the SKS and Hyperball-J. We also thank A. Umeya, T. Motoba, and D. J. Millener for their theoretical calculations of . This work is partially supported by Tohoku University’s Focused Research Project, and Grants-in-Aid No. 17070001, No. 21684011, No. 23244043, No. 24105003, No. 24740138, and No. 15H02079 for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japan. This research is also supported by World Class University program (Grant No. R32-10155), Basic Research (Young Researcher) (Grant No. 2010-0004752), Center for Korean J-PARC Users (Grants No. K2100200173811B130002410 and No. NRF-2013K1A3A7A06056592), and Brain Korea 21 Plus program through National Research Foundation (NRF) of Korea.

Funding Information:
This work is partially supported by Tohoku University's Focused Research Project, and Grants-in-Aid No.17070001, No.21684011, No.23244043, No.24105003, No.24740138, and No.15H02079 for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japan. This research is also supported by World Class University program (Grant No.R32-10155), Basic Research (Young Researcher) (Grant No.2010-0004752), Center for Korean J-PARC Users (Grants No.K2100200173811B130002410 and No.NRF-2013K1A3A7A06056592), and Brain Korea 21 Plus program through National Research Foundation (NRF) of Korea.

Publisher Copyright:
© 2018 American Physical Society.

ASJC Scopus subject areas

  • General Physics and Astronomy

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