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Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reaction
- Source :
- Phys.Rev.Lett.104:192501,2010
- Publication Year :
- 2010
-
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.<br />Comment: Phys. Rev. Lett. in press (4 pages, 3 figures)
- Subjects :
- Nuclear Experiment
Nuclear Theory
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys.Rev.Lett.104:192501,2010
- Publication Type :
- Report
- Accession number :
- edsarx.1004.1556
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.104.192501