Do nucleons in abnormal-parity states contribute to deformation

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.164· OSTI ID:7113892

Bhatt, K H ^[1]; Nestor, Jr, C W; Raman, S ^[2]

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1. Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677 (United States) Joint Institute for Heavy-Ion Research, Holifield Heavy Ion Research Facility, Oak Ridge, Tennessee 37831 (United States)
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

We consider intrinsic states of highly deformed nuclei in the framework of the universal Woods-Saxon model and show that valence nucleons in abnormal-parity high-{ital j} states contribute {similar to}20% to the electric quadrupole moments of these nuclei. Similarly, we show that in the single-shell asymptotic Nilsson model this contribution is {similar to}25% if reasonable effective charges are employed. We discuss, at some length, procedures used to arrive at reasonable effective charges. Both models reproduce the measured {ital B}({ital E}2;0{sub 1}{sup +}{r arrow}2{sub 1}{sup +}) values in the rare-earth and actinide regions without the need for normalization constants. No support is found for the assumption made in the pseudo-SU(3) and the fermion dynamic symmetry models that valence nucleons in abnormal-parity high-{ital j} states do not contribute to deformation. This counterintuitive assumption leads to an underestimate of the {ital B}({ital E}2;0{sub 1}{sup +}{r arrow}2{sub 1}{sup +}) values, which is compensated in these models by the use of appropriate normalization constants. Once the magnitudes are fixed, both models do correctly reproduce the {ital B}({ital E}2) trends.

• DOE Contract Number: AC05-84OR21400; AS05-76ER04936
• OSTI ID: 7113892
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 46:1; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DEFORMED NUCLEI
E2-TRANSITIONS
WOODS-SAXON POTENTIAL
NILSSON-MOTTELSON MODEL
PARITY
SHELL MODELS
SU-3 GROUPS
ENERGY-LEVEL TRANSITIONS
LIE GROUPS
MATHEMATICAL MODELS
MULTIPOLE TRANSITIONS
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEI
PARTICLE PROPERTIES
POTENTIALS
SU GROUPS
SYMMETRY GROUPS
663120* - Nuclear Structure Models & Methods- (1992-)