Observation of spin-orbit splitting in lambda single-particle states

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

doi:10.1103/PhysRevLett.86.4255

Observation of spin-orbit splitting in lambda single-particle states

Phys Rev Lett. 2001 May 7;86(19):4255-8. doi: 10.1103/PhysRevLett.86.4255.

Authors

Affiliation

¹ Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan.

PMID: 11328148
DOI: 10.1103/PhysRevLett.86.4255

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.