2008/07/15 by A. Gade, P. Adrich, D. Bazin +14 · 1 citation
Physics and Astronomy · #Astronomical and nuclear sciences #Atomic and Molecular Physics #Nuclear physics research studies #nucl-ex
paper · pdf · doi:10.1016/j.physletb.2008.07.062
published as Phys. Lett. B 666, 218 (2008) · Physics Letters B, accepted
arxiv created 2008/07/15 · openalex publication_date 2008/07/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We report on the first in-beam γ-ray spectroscopy of 23Al using two different reactions at intermediate beam energies: inelastic scattering off 9Be and heavy-ion induced one-proton pickup, 9Be(22Mg,23Al+γ)X, at 75.1 MeV/nucleon. A γ-ray transition at 1616(8) keV—exceeding the proton separation energy by 1494 keV—was observed in both reactions. From shell model and proton decay calculations we argue that this γ-ray decay proceeds from the core-excited 7/2+ state to the 5/2+ ground state of 23Al. The proposed nature of this state, [22Mg(21+)⊗πd5/2]7/2+, is consistent with the presence of a γ-branch and with the population of this state in the two reactions.