Hypernuclear fine structure in (16)(Lambda)O and the LambdaN tensor interaction

M Ukai; S Ajimura; H Akikawa; D E Alburger; A Banu; R E Chrien; G B Franklin; J Franz; O Hashimoto; T Hayakawa; H Hotchi; K Imai; T Kishimoto; M May; D J Millener; S Minami; Y Miura; T Miyoshi; K Mizunuma; T Nagae; S N Nakamura; K Nakazawa; Y Okayasu; P Pile; B P Quinn; A Rusek; Y Sato; R Sutter; H Takahashi; L Tang; H Tamura; K Tanida; L Yuan; S H Zhou; [E930('01) Collaboration]

doi:10.1103/PhysRevLett.93.232501

Hypernuclear fine structure in (16)(Lambda)O and the LambdaN tensor interaction

Phys Rev Lett. 2004 Dec 3;93(23):232501. doi: 10.1103/PhysRevLett.93.232501. Epub 2004 Nov 29.

Affiliation

¹ Department of Physics, Tohoku University, Sendai 980-8578, Japan.

PMID: 15601150
DOI: 10.1103/PhysRevLett.93.232501

Abstract

We have observed two gamma-ray transitions in (16)(Lambda)O from the 6.6 MeV excited 1(-)(2) state to both ground-state spin-doublet members (1(-)(1),0(-)) by the (K-,pi(-)gamma) reaction. We have obtained the ground-state doublet spacing to be 26.4+/-1.6(stat)+/-0.5(syst) keV and the excitation energy of the 1(-)(2) state to be 6561.7+/-1.1(stat)+/-1.7(syst) keV. The ground-state doublet spacing provides a small but nonzero strength of the tensor interaction between a Lambda and a nucleon. This is the first experimental result on the LambdaN tensor interaction.