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Título : Migration of Nuclear Shell Gaps Studied in the d(Ne-24, p gamma)Ne-25 Reaction
Autor : 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.
Fecha de publicación : 14-May-2010
Editor: American Physical Society
Resumen: 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.
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ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.104.192501
Citación : Physical Review Letters 104 (19): 192501 (2010)
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