Migration of Nuclear Shell Gaps Studied in the d(^{24}Ne,pγ)^{25}Ne Reaction

WN Catford, CN Timis, RC Lemmon, M Labiche, NA Orr, B Fernandez-Dominguez, R Chapman, Martin Freer, M Chartier, H Savajols, M Rejmund, NL Achouri, N Amzal, Nicholas Ashwood, TD Baldwin, M Burns, L Caballero, JM Casadjian, Neil Curtis, G de FranceW Gelletly, X Liang, SD Pain, VPE Pucknell, B Rubio, O Sorlin, K Spohr, C Theisen, DD Warner

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The transfer of neutrons onto Ne-24 has been measured using a reaccelerated radioactive beam of Ne-24 to study the (d, p) reaction in inverse kinematics. The unusual raising of the first 3/2(+) level in Ne-25 and its significance in terms of the migration of the neutron magic number from N = 20 to N = 16 is put on a firm footing by confirmation of this state's identity. The raised 3/2(+) level is observed simultaneously with the intruder negative parity 7/2(-) and 3/2(-) levels, providing evidence for the reduction in the N = 20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2(+) state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
Original languageEnglish
Article number192501
Pages (from-to)n/a
JournalPhysical Review Letters
Issue number19
Publication statusPublished - 1 May 2010


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