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Observation of spin-orbit splitting in lambda single-particle states
S Ajimura1, H Hayakawa, T Kishimoto
1Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan.
Physical Review Letters
|May 1, 2001
Abstract:
The spin-orbit splitting of Lambda single-particle states in (13)(Lambda)C was measured. The 13C(K-,pi(-))(13)(Lambda)C reaction was used to excite both the 1/2(-) and 3/2(-) states simultaneously, which have predominantly 12C(0(+)) x p(Lambda) configuration. gamma rays from the states to the ground state were measured in coincidence with the pi(-)'s, by which ls splitting was found to be 152+/-54(stat)+/-36(syst) keV. The value is 20-30 times smaller than exhibited by the ls splitting in the nuclear shell model. This value gives us new insight into the YN interaction.