{alpha}-cluster structure and density waves in oblate nuclei

Journal Article · Fri Jul 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.014313· OSTI ID:21596559

Kanada-En'yo, Yoshiko; Hidaka, Yoshimasa ^[1]

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1. Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)

Pentagon and triangle shapes in {sup 28}Si and {sup 12}C are discussed in relation to nuclear density waves. In the antisymmetrized molecular dynamics calculations, the K{sup {pi}=}5{sup -} band in {sup 28}Si and the K{sup {pi}=}3{sup -} band in {sup 12}C are described by the pentagon and triangle shapes, respectively. These negative-parity bands can be interpreted as the parity partners of the K{sup {pi}=}0{sup +} ground bands and they are constructed from the parity-asymmetric-intrinsic states. The pentagon and the triangle shapes originate in 7{alpha}- and 3{alpha}-cluster structures, respectively. In a mean-field picture, they are described also by the static one-dimensional density waves at the edge of the oblate states. In analyses with ideal {alpha}-cluster models using Brink-Bloch cluster wave functions and that with a simplified model, we show that the static edge density waves for the pentagon and triangle shapes can be understood by spontaneous breaking of axial symmetry, i.e., the instability of the oblate states with respect to the edge density waves. The density wave is enhanced in the Z=N nuclei due to the proton-neutron coherent density waves, while it is suppressed in Z{ne}N nuclei.

• OSTI ID: 21596559
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 84, Issue 1; Other Information: DOI: 10.1103/PhysRevC.84.014313; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
AXIAL SYMMETRY
CARBON 12
CLUSTER MODEL
DENSITY
INSTABILITY
KAONS MINUS
MEAN-FIELD THEORY
MOLECULAR DYNAMICS METHOD
NEUTRONS
NUCLEAR MATTER
PROTONS
SILICON 28
WAVE FUNCTIONS
BARYONS
BOSONS
CALCULATION METHODS
CARBON ISOTOPES
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
FERMIONS
FUNCTIONS
HADRONS
ISOTOPES
KAONS
LIGHT NUCLEI
MATHEMATICAL MODELS
MATTER
MESONS
NUCLEAR MODELS
NUCLEI
NUCLEONS
PHYSICAL PROPERTIES
PSEUDOSCALAR MESONS
SILICON ISOTOPES
STABLE ISOTOPES
STRANGE MESONS
STRANGE PARTICLES
SYMMETRY