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Above threshold s-wave resonances illustrated by the 1 / 2+ states in 9Be and 9B

AutorGarrido, Eduardo ; Fedorov, D.V.; Jensen, A.S.
Fecha de publicación2010
CitaciónPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 684: 132- 136 (2010)
ResumenWe solve the persistent problem of the structure of the lowest 1 / 2+ resonance in 9Be which is important to bridge the A = 8 gap in nucleosynthesis in stars. We show that the state is a genuine three-body resonance even though it decays entirely into neutron-8Be relative s-waves. The necessary barrier is created by >dynamical> evolution of the wave function as the short-distance α-5He structure is changed into the large-distance n-8Be structure. This decay mechanism leads to a width about two times smaller than table values. The previous interpretations as a virtual state or a two-body resonance are incorrect. The isobaric analog 1 / 2+ state in 9B is found to have energy and width in the vicinity of 2.0 MeV and 1.5 MeV, respectively. We also predict another 1 / 2+ resonance in 9B with similar energy and width. © 2010 Elsevier B.V. All rights reserved.
Identificadoresdoi: 10.1016/j.physletb.2009.12.065
issn: 0370-2693
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