Abstract
Experimental studies of neutron drip line nuclei are introduced. The neutron drip line in the oxygen-magnesium region has been explored by the projectile fragmentation of a 48Ca beam. New neutron-rich isotopes, 34Ne and 37Na, have been observed together with some evidence for the particle instability of 33Ne and 36Na. Recent data on mass measurements of neutron-rich nuclei at GANIL and some characteristics of binding energies in this region are discussed. Nuclear binding energies are very sensitive to the existence of nuclear shells, and together with the measurements of instability of doubly magic nuclide 28O, they provide information on changes in neutron shell closures of very neutron-rich isotopes from carbon up to calcium. The conclusion about a rearrangement in neutron shell closures is given. The spectroscopic measurements can reveal details of the underlying microscopic structures; in-beam γ-ray spectroscopy is an effective tool to check for shell closures. The results on the γ-ray energies of the first 2+ level in even-even nuclei for the range N=12–32 are discussed. The strength of N=20 and N=28 shells is variable in the region from carbon up to magnesium.
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From Yadernaya Fizika, Vol. 67, No. 9, 2004, pp. 1654–1659.
Original English Text Copyright © 2004 by Lukyanov, Penionzhkevich.
This article was submitted by the authors in English.
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Lukyanov, S.M., Penionzhkevich, Y.E. The neutron drip line in the region of N=20 and N=28 closures. Phys. Atom. Nuclei 67, 1627–1632 (2004). https://doi.org/10.1134/1.1802348
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DOI: https://doi.org/10.1134/1.1802348