2010/01/04 by E. Garrido, D. V. Fedorov, A. S. Jensen · 2 citations
Physics and Astronomy · #Atomic physics #Energy (signal processing) #Hadron #Neutron #Nuclear physics #Nuclear physics research studies #Nuclear reaction #Nucleosynthesis #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Resonance (particle physics) #nucl-th
paper · pdf · doi:10.1016/j.physletb.2009.12.065
published as Physics Letters B 684 (2010) 132 · To be published in Physics Letters B
arxiv created 2010/01/04 · openalex publication_date 2010/01/08 · arxiv updated 2015/05/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We 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.