Mjg. Borge et al., ELUCIDATING HALO STRUCTURE BY BETA-DECAY - BETA-GAMMA FROM THE LI-11 DECAY, Physical review. C. Nuclear physics, 55(1), 1997, pp. 8-11
New values for the gamma ray intensities following the beta decay of L
i-11 are presented. Special emphasis is put on the determination of th
e Gamow-Teller transition Li-11 --> Be-11 (1/2(-), 320 keV) to the onl
y bound excited state in Be-11. We show that a shell-model calculation
can simultaneously reproduce the half-life of Li-11 and the newly mea
sured branching ratio to the 1/2(-) state provided the Li-11 ground st
ate wave function contains about 50% of s-wave neutron components.