Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvc..65c4607k&link_type=abstract
Physical Review C, vol. 65, Issue 3, id. 034607
Physics
27
Hypernuclei, Kaon-Induced Reactions, Hyperon-Nucleon Interactions, Nuclear Matter Aspects Of Neutron Stars
Scientific paper
The 13ΛC 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 13ΛC. 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.
Ajimura S.
Akikawa H.
Chrien Robert E.
Eugenio P. M.
Franklin G.
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