Phys. Rev. C 65, 034607 (2002) [9 pages]Λ13C hypernucleus studied with the 13C(K-,π-γ) reactionReceived 11 October 2001; published 15 February 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.034607
DOI:
10.1103/PhysRevC.65.034607
PACS:
21.80.+a, 25.80.Nv, 13.75.Ev, 26.60.+c
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