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

Abstract : 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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Contributor : Michel Lion <>
Submitted on : Monday, April 12, 2010 - 8:48:46 AM
Last modification on : Saturday, June 13, 2020 - 6:30:02 PM

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W. N. Catford, C. N. Timis, R. C. Lemmon, M. Labiche, N.A. Orr, et al.. Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reaction. Physical Review Letters, American Physical Society, 2010, 104, pp.192501. ⟨10.1103/PhysRevLett.104.192501⟩. ⟨in2p3-00472413⟩



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