Super-strong β-decay of 11Li into 11Be∗ (18 MeV) state: a probe for halo p-wave component?

✍ Scribed by I. Mukha; M.J.G. Borge; D. Guillemaud-Mueller; P. Hornshøj; F. Humbert; B. Jonson; T.E. Leth; G. Martínez Pinedo; T. Nilsson; G. Nyman; K. Riisager; G. Schrieder; M.H. Smedberg; O. Tengblad

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 529 KB
• Volume: 616
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)00089-4

✦ Synopsis

An experimental study of P-delayed charged particles (H, He, Be), neutrons and y-rays that follow the "Li P-decay, clearly indicates a P-feeding to an exited state at 18.1 MeV in I'Be with a large Gamow-Teller strength, B ok 21.0. The large strength of this p-transition implies a broad overlap of the "Be' state at 18.1 MeV and the ground state of IlLi. The deduced width of this resonance is -1 MeV. A strong suppression of the branch from 18.1 MeV state into the "Be+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 structure is that the admixture of (p,,,)' configuration in "Li might be small.