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New mass measurements of neutron-rich nuclei near N=20

1991; Elsevier BV; Volume: 258; Issue: 1-2 Linguagem: Inglês

10.1016/0370-2693(91)91203-8

1873-2445

N. A. Orr, W. Mittig, L.K. Fifield, M. Lewitowicz, E. Plagnol, Y. Schütz, Zhan Wen Long, L. Bianchi, A. Gillibert, A. V. Belozyorov, S. M. Lukyanov, Yu. É. Penionzhkevich, A. C. C. Villari, A. Cunsolo, A. Foti, G. Audi, C. Stéphan, L. Tassan–Got,

Quantum Chromodynamics and Particle Interactions

The masses of 39 neutron-rich nuclei in the mass range 17–37 have been measured using a direct time-of-flight technique following the fragmentation of a 48Ca beam at 55 MeV/nucleon. The masses of 29,30Ne, 34,35Mg and 36,37Al are reported for the first time. The very neutron-rich nuclei, 31–33Na, are found to be 2–4 MeV less bound than previously believed. A comparison is made with recently available large scale shell model calculations encompassing the deformed A∼32 nuclei. Conclusions are drawn regarding the extent of the region of deformation, which is found to include 30Ne.