Gamow shell-model calculations of drip-line oxygen isotopes
Journal Article
·
· Physical Review. C, Nuclear Physics
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo (Japan)
- Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo (Norway)
- Physics Division, Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, Tennessee 37831 (United States)
We employ the Gamow shell model (GSM) to describe low-lying states of the oxygen isotopes {sup 24}O and {sup 25}O. The many-body Schroedinger equation is solved starting from a two-body Hamiltonian defined by a renormalized low-momentum nucleon-nucleon (NN) interaction and a spherical Berggren basis. The Berggren basis treats bound, resonant, and continuum states on an equal footing and is therefore an appropriate representation of loosely bound and unbound nuclear states near threshold. We show that the inclusion of continuum effects has a significant effect on the low-lying 1{sup +} and 2{sup +} excited states in {sup 24}O. On the other hand, we find that a correct description of binding energy systematics of the ground states is driven by the proper treatment and inclusion of many-body correlation effects. This is supported by the fact that we get {sup 25}O unstable with respect to {sup 24}O in both oscillator and Berggren representations starting from a {sup 22}O core. Furthermore, we show that the structure of these loosely bound or unbound isotopes is strongly influenced by the {sup 1}S{sub 0} component of the NN interaction. This has important consequences for our understanding of nuclear stability.
- OSTI ID:
- 21296461
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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