The Neutron Drip Line in the Region of N = 20 and N = 28 Closures
- Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 (Russian Federation)
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 {sup 48}Ca beam. New neutron-rich isotopes, {sup 34}Ne and {sup 37}Na, have been observed together with some evidence for the particle instability of {sup 33}Ne and {sup 36}Na. 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 {sup 28}O, 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 {gamma}-ray spectroscopy is an effective tool to check for shell closures. The results on the {gamma}-ray energies of the first 2{sup +} 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.
- OSTI ID:
- 20692616
- Journal Information:
- Physics of Atomic Nuclei, Vol. 67, Issue 9; Other Information: Translated from Yadernaya Fizika, ISSN 0044-0027, 67, 1654-1659 (No. 9, 2004); DOI: 10.1134/1.1802348; (c) 2004 MAIK ''Nauka / Interperiodica''; Country of input: International Atomic Energy Agency (IAEA); TN:; ISSN 1063-7788
- Country of Publication:
- United States
- Language:
- English
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