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First determination of the level structure of an $$sd$$-shell hypernucleus, $$^{19}_{Lambda}$$F

Yang, S. B.*; Ekawa, Hiroyuki; Hasegawa, Shoichi   ; Hayakawa, Shuhei; Hosomi, Kenji  ; Ichikawa, Yudai   ; Imai, Kenichi; Sako, Hiroyuki   ; Sato, Susumu  ; Tanida, Kiyoshi   ; Sugimura, Hitoshi; J-PARC E13 Collaboration*; 37 of others*

We report on the first observation of $$gamma$$ rays emitted from an $$sd$$-shell hypernucleus, $$^{19}_{Lambda}$$F. The energy spacing between the ground state doublet, $$1/2^+$$ and $$3/2^+$$ states, of $$^{19}_{Lambda}$$F is determined to be $$315.5pm0.4({rm stat.})^{+0.6}_{-0.5}({rm syst.})$$ keV by measuring the $$gamma$$-ray energy of the $$M1(3/2^+ to 1/2^+)$$ transition. In addition, three $$gamma$$-ray peaks are observed and assigned as $$E2(5/2^+ to 1/2^+)$$, $$E1(1/2^- to 1/2^+)$$, and $$E1(1/2^- to 3/2^+)$$ transitions. The excitation energies of the $$5/2^+$$ and $$1/2^-$$ states are determined to be $$895.2pm0.3({rm stat.})pm0.5({rm syst.})$$ keV and $$1265.6pm1.2({rm stat.})^{+0.5}_{-0.7}({rm syst.})$$ 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.

Language

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English

Journal

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Physical Review Letters

Volume

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120

Number

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13

Pages

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p.132505_1 - 132505_5

Publication Year/Month

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2018/03

Meeting title

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Held date

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Location (city)

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Location (country)

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Patent information

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PDF

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AA2018-0124.pdf:0.62MB

Paper URL

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https://doi.org/10.1103/PhysRevLett.120.132505

DOI for research data

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Keywords

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ストレンジネス核物理; ハイパー核

Research Facility

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J-PARC原子核素粒子実験施設  

Press Release

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Article of JAEA R&D Review

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Seeing Hypernuclei by $$gamma$$ rays; Can Hidden "Strangeness" in Neutron Stars Be Disclosed?[/]

Cooperating Institute

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Accesses

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- Accesses

InCites™

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Percentile:54.37

Category:Physics, Multidisciplinary

Altmetrics

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