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Open Access item Migration of Nuclear Shell Gaps Studied in the d(Ne-24, p gamma)Ne-25 Reaction

Authors:Caballero Ontanaya, Luis
Rubio, Berta
Catford, W. N.
Timis, C. N.
Lemmon, R. C.
Labiche, M.
Orr, N. A.
Fernández-Domínguez, B.
Chapman, R.
Freer, M.
Chartier, M.
Savajols, H.
Rejmund, M.
Achouri, N. L.
Amzal, N.
Ashwood, N. I.
Baldwin, T. D.
Burns, M.
Casadjian, J. M.
Curtis, N.
France, G. de
Gelletly, W.
Liang, X.
Pain, S. D.
Pucknell, V. F. E.
Sorlin, O.
Spohr, K. -M.
Theisen, Ch.
Warner, D. D.
Issue Date:14-May-2010
Publisher:American Physical Society
Citation:Physical Review Letters 104 (19): 192501 (2010)
Abstract: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.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevLett.104.192501
Appears in Collections:(IFIC) Artículos

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