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Trache, M Chartier, M Dimmock, M Freer, M Horoi, M Labiche, M Petri, NA Orr, NL Achouri, N Patterson, P Roussel-Chomaz, RC Lemmon, RE Tribble, S Paschalis, WN Catford","submitted_at":"2011-04-04T20:07:02Z","abstract_excerpt":"The ground state of the proton-rich nucleus 23Al has been studied by one-proton removal on a carbon target at about 50 MeV/nucleon using the EXOGAM + SPEG experimental setup at GANIL. Longitudinal momentum distributions of the 22Mg breakup fragments, inclusive and in coincidence with gamma rays de-exciting the residues, were measured. The ground-state structure of 23Al is found to be a configuration mixing of a d-orbital valence proton coupled to four core states - 0$^{+}_{gs}$, 2$^{+}_{1}$, 4$^{+}_{1}$, 4$^{+}_{2}$. We confirm the ground state spin and parity of 23Al as $J^{\\pi} = 5/2^{+}$. 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