Description of nuclear octupole and quadrupole deformation close to the axial symmetry and phase transitions in the octupole mode

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.064319· OSTI ID:20695817

Bizzeti, P G; Bizzeti-Sona, A M ^[1]

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1. Dipartimento di Fisica, Universita di Firenze I.N.F.N., Sezione di Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino, Florence (Italy)

The dynamics of nuclear collective motion is investigated in the case of reflection-asymmetric shapes. The model is based on a new parametrization of the octupole and quadrupole degrees of freedom, valid for nuclei close to the axial symmetry. Amplitudes of oscillation in other degrees of freedom different from the axial ones are assumed to be small, but not frozen to zero. The case of nuclei which already possess a permanent quadrupole deformation is discussed in some more detail and a simple solution is obtained at the critical point of the phase transition between harmonic octupole oscillation and a permanent asymmetric shape. The results are compared with experimental data of the thorium isotopic chain. The isotope {sup 226}Th is found to be close to the critical point.

• OSTI ID: 20695817
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 70; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ASYMMETRY
AXIAL SYMMETRY
COLLECTIVE MODEL
DEFORMED NUCLEI
DEGREES OF FREEDOM
NUCLEAR DEFORMATION
OCTUPOLES
PHASE TRANSFORMATIONS
QUADRUPOLES
THORIUM 226