Super-strong beta-decay of Li-11 into Be-11* (18 MeV) state: A probe for halo p-wave component?
Paper i proceeding, 1997

An experimental study of beta-delayed charged particles (H, He, Be), neutrons and gamma-rays that follow the Li-11 beta-decay, clearly indicates a beta-feeding to an exited state at 18.1 MeV in Be-11 with a large Gamow-Teller strength, B-GT greater than or equal to 1.0. The large strength of this beta-transition implies a broad overlap of the Be-11* state at 18.1 MeV and the ground state of Li-11. The deduced width of this resonance is similar or equal to 1 MeV. A strong suppression of the branch from 18.1 MeV state into the Be-10+n channel is observed. This branch, with the largest decay energy, has a partial width less than 1% of the total width. A centrifugal barrier consideration fails to explain this effect. A possible consequence of the observed effect for the Li-11 structure is that the admixture of (p(1/2))(2) configuration in Li-11 might be small.

DEUTERON

EMISSION

Författare

I. Mukha

M. J. G. Borge

D. GuillemaudMueller

P. Hornshoj

F. Humbert

Björn Jonson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

T. E. Leth

G. M. Pinedo

Thomas Nilsson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Göran Hugo Nyman

K. Riisager

G. Schrieder

Martin Smedberg

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

O. Tengblad

Nuclear Physics A

0375-9474 (ISSN)

Vol. 616 1-2 C201-C207

Ämneskategorier

Subatomär fysik

DOI

10.1016/S0375-9474(97)00089-4