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Physical Review Letters 104 (2010) 192501
Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reaction
W. N. Catford1, C. N. Timis1, R. C. Lemmon2, M. Labiche2, 3, N.A. Orr4, B. Fernandez-Dominguez5, R. Chapman3, M. Freer6, M. Chartier5, H. Savajols7, M. Rejmund7, N.L. Achouri4, N. Amzal3, N. I. Ashwood6, T. D. Baldwin1, M. Burns3, L. Caballero8, J. M. Casadjian7, 9, N. Curtis6, G. De France7, W. Gelletly1, X. Liang3, S. D. Pain1, V. P. E. Pucknell2, B. Rubio8, O. Sorlin7, K. Spohr3, Ch. Theisen9, D. D. Warner2

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.
1 :  Department of Physics
2 :  Nuclear Physics Group
3 :  School of Engineering and Science
4 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
5 :  Oliver Lodge Laboratory
6 :  School of Physics and Astronomy
7 :  GANIL - Grand Accélérateur National d'Ions Lourds
8 :  IFIC - Instituto de Fisica Corpuscular
9 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
Structure nucléaire
Physique/Physique Nucléaire Expérimentale

Physique/Physique Nucléaire Théorique
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