Λ13C hypernucleus studied with the 13c(K-, π-γ) reaction

H. Kohri, S. Ajimura, H. Hayakawa, T. Kishimoto, K. Matsuoka, S. Minami, Y. S. Miyake, T. Mori, K. Morikubo, E. Saji, A. Sakaguchi, Y. Shimizu, M. Sumihama, R. E. Chrien, M. May, P. Pile, A. Rusek, R. Sutter, P. M. Eugenio, G. FranklinP. Khaustov, K. Paschke, B. P. Quinn, R. A. Schumacher, J. Franz, T. Fukuda, H. Noumi, H. Outa, L. Gan, L. Tang, L. Yuan, J. Nakano, T. Tamagawa, K. Tanida, R. Sawafta, H. Tamura, H. Akikawa

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Abstract

The λ13C hypernucleus was studied by measuring γ rays in coincidence with the 13C(K-, π-) reaction, γ rays from the 1/2- and 3/2- states, which are the partners of the spin-orbit doublet states with a predominant configuration of [12Cg.s.(0+)⊗pΛ], to the ground state were measured. The splitting of the states was found to be ΔE(1/2--3/2-) = + 152±54(stat)±36(syst) keV. This value is 20-30 times smaller than that of single particle states in nuclei around this mass region. The jΛ = ℓΛ - 1/2[(p1/2)Λ] state appeared higher in energy, as in normal nuclei. The value gives new insight into the YN interaction. The excitation energies of the 1/2- and 3/2- states were obtained as 10.982±0.031(stat)±0.056(syst) and 10.830±0.031(stat)±0.056(syst) MeV, respectively. We also observed γ rays from the 3/2+ state, which has a [12C(2+)⊗ sΛ] configuration, to the ground state in Λ13C. The excitation energy of the 3/2+ state was obtained as 4.880 ± 0.010(stat) ±0.017(syst) MeV. Nuclear γ rays with energies of 4.438 and 15.100 MeV had similar yields, which suggests that a quasifree knockout of a Λ particle is dominant in highly excited regions.

Original languageEnglish
Article number034607
Pages (from-to)346071-346079
Number of pages9
JournalPhysical Review C - Nuclear Physics
Volume65
Issue number3
Publication statusPublished - 2002 Mar
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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