Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction

W.N. Catford, C.N. Timis, R.C. Lemmon, M. Labiche, N.A. Orr, B. Fernandez-Dominguez, R. Chapman, M. Freer, M. Chartier, H. Savajols, M. Rejmund, N.L. Achouri, N. Amzal, N.I. Ashwood, T.D. Baldwin, M. Burns, L. Caballero, J.M. Casadjian, N. Curtis, G. de FranceW. Gelletly, X. Liang, S.D. Pain, V.P.E. Pucknell, B. Rubio, O. Sorlin, K.M. Spohr, Ch. Theisen, D.D. Warner

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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.
Original languageEnglish
Article number192501
JournalPhysical Review Letters
Volume104
Issue number19
DOIs
Publication statusPublished - 14 May 2010

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Keywords

  • radioactive beams
  • breakup channels
  • neutron
  • decay
  • array

Cite this

Catford, W. N., Timis, C. N., Lemmon, R. C., Labiche, M., Orr, N. A., Fernandez-Dominguez, B., Chapman, R., Freer, M., Chartier, M., Savajols, H., Rejmund, M., Achouri, N. L., Amzal, N., Ashwood, N. I., Baldwin, T. D., Burns, M., Caballero, L., Casadjian, J. M., Curtis, N., ... Warner, D. D. (2010). Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction. Physical Review Letters, 104(19), [192501]. https://doi.org/10.1103/PhysRevLett.104.192501