Low-energy dipole excitations in neon isotopes and N=16 isotones within the quasiparticle random-phase approximation and the Gogny force

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.034309· OSTI ID:21499478

Martini, M; Peru, S; Dupuis, M ^[1]

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1. CEA/DAM/DIF, F-91297 Arpajon (France)

Low-energy dipole excitations in neon isotopes and N=16 isotones are calculated with a fully consistent axially-symmetric-deformed quasiparticle random phase approximation (QRPA) approach based on Hartree-Fock-Bogolyubov (HFB) states. The same Gogny D1S effective force has been used both in HFB and QRPA calculations. The microscopical structure of these low-lying resonances, as well as the behavior of proton and neutron transition densities, are investigated in order to determine the isoscalar or isovector nature of the excitations. It is found that the N=16 isotones {sup 24}O, {sup 26}Ne, {sup 28}Mg, and {sup 30}Si are characterized by a similar behavior. The occupation of the 2s{sub 1/2} neutron orbit turns out to be crucial, leading to nontrivial transition densities and to small but finite collectivity. Some low-lying dipole excitations of {sup 28}Ne and {sup 30}Ne, characterized by transitions involving the {nu}1d{sub 3/2} state, present a more collective behavior and isoscalar transition densities. A collective proton low-lying excitation is identified in the {sup 18}Ne nucleus.

• OSTI ID: 21499478
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
APPROXIMATIONS
AXIAL SYMMETRY
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCULATION METHODS
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EVEN-EVEN NUCLEI
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FERMIONS
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HARTREE-FOCK METHOD
HOURS LIVING RADIOISOTOPES
ISOTONIC NUCLEI
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LIGHT NUCLEI
MAGNESIUM 28
MAGNESIUM ISOTOPES
MILLISECONDS LIVING RADIOISOTOPES
MULTIPOLES
NEON 18
NEON 26
NEON 28
NEON 30
NEON ISOTOPES
NEUTRONS
NUCLEI
NUCLEONS
OXYGEN 24
OXYGEN ISOTOPES
PHYSICAL PROPERTIES
PROTONS
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RANDOM PHASE APPROXIMATION
SECONDS LIVING RADIOISOTOPES
SILICON 30
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SYMMETRY
TENSORS
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