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arxiv 1004.1556 v1 pith:I7CS2QAX submitted 2010-04-09 nucl-ex nucl-th

Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reaction

classification nucl-ex nucl-th
keywords levelmigrationmodelreactionshellstatewellallowed
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne 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.

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