2010/04/09 by W. N. Catford, C. N. Timis, C. Timis +31 · 1 citation
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Astronomical and nuclear sciences #Nuclear physics research studies #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevlett.104.192501
published as Phys.Rev.Lett.104:192501,2010 · Phys. Rev. Lett. in press (4 pages, 3 figures)
arxiv created 2010/04/09 · openalex publication_date 2010/05/10 · arxiv updated 2010/05/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
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.