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In-beam γ-ray spectroscopy at the proton dripline: 23Al

Gade, A, Adrich, P, Bazin, D, Bowen, MD, Brown, BA, Campbell, CM, Cook, JM, Glasmacher, T, Hosier, K, McDaniel, S, McGlinchery, D, Obertelli, A, Riley, LA, Siwek, K, Tostevin, JA and Weisshaar, D (2008) In-beam γ-ray spectroscopy at the proton dripline: 23Al Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 666 (3). 218 - 221. ISSN 0370-2693

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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, is consistent with the presence of a γ-branch and with the population of this state in the two reactions.

Item Type: Article
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 24 Oct 2011 09:25
Last Modified: 23 Sep 2013 18:47

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