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 00:00:00 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, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevC.83.034309; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

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