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

I. Mukha ; M. J. G. Borge ; D. GuillemaudMueller ; P. Hornshoj ; F. Humbert ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; T. E. Leth ; G. M. Pinedo ; Thomas Nilsson (Institutionen för experimentell fysik, Subatomär fysik) ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik ; Extern) ; K. Riisager ; G. Schrieder ; Martin Smedberg (Institutionen för experimentell fysik, Subatomär fysik) ; O. Tengblad
Nuclear Physics A (0375-9474). Vol. 616 (1997), 1-2, p. C201-C207.
[Konferensbidrag, refereegranskat]

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.


Denna post skapades 2006-08-28. Senast ändrad 2014-09-02.
CPL Pubid: 11047


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