Probing the Li-11 halo structure through beta-decay into the Be-11(*) (18 MeV) state

M. J. G. Borge; L. Grigorenko; D. GuillemaudMueller; P. Hornshoj; F. Humbert; Björn Jonson; T. E. Leth; G. M. Pinedo; I. Mukha; Thomas Nilsson; Göran Hugo Nyman; K. Riisager; G. Schrieder; Martin Smedberg; O. Tengblad; Mikhail Zhukov

doi:10.1016/S0375-9474(96)00434-4

Probing the Li-11 halo structure through beta-decay into the Be-11(*) (18 MeV) state
Journal article, 1997

An experimental study of beta-delayed charged particles (H, He, Be) from Li-11 shows a beta-feeding to an excited state at 18.15(15) MeV in Be-11 with a large Gamow-Teller strength, B-GT greater than or equal to 1.6. Branching ratios and reduced widths of 2-, 3- and 5- particle decay channels of this state are extracted, A strong suppression of the neutron branch from the 18 MeV state to the Be-10(g.s.) is observed, We suggest that the measured partial width may be sensitive to the (p(1/2))(2) component in the Li-11 halo, A rough estimate indicates that the (p(1/2))(2) component is not the dominant one in the halo wave-function.

RADIOACTIVITY Li-11(beta(-))

DEUTERON

Delta E-E

[Ta+p] reaction

Be spectra

telescope

branching ratios

deduced Garnow-Teller strength and

measured beta-delayed H

on-line mass separation

energy level at 18.15 MeV in Be-11

BE-11

Author

M. J. G. Borge

L. Grigorenko