Shape transition and oblate-prolate coexistence in N=Z fpg-shell nuclei

Journal Article · Mon Nov 01 00:00:00 EST 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.051301· OSTI ID:20695709

Kaneko, K ^[1]; Hasegawa, M ^[2]; Mizusaki, T ^[3]

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1. Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503 (Japan)
2. Laboratory of Physics, Fukuoka Dental College, Fukuoka 814-0193 (Japan)
3. Institute of Natural Sciences, Senshu University, Kawasaki, Kanagawa, 214-8580 (Japan)

Nuclear shape transition and oblate-prolate coexistence in N=Z nuclei are investigated within the configuration space ( 2p{sub 3/2}, 1f{sub 5/2}, 2p{sub 1/2}, and 1g{sub 9/2}). We perform shell-model calculations for {sup 60}Zn, {sup 64}Ge, and {sup 68}Se, and constrained Hartree-Fock (CHF) calculations for {sup 60}Zn, {sup 64}Ge, {sup 68}Se, and {sup 72}Kr, employing an effective pairing plus quadrupole residual interaction with monopole interactions. The shell-model calculations reproduce well the experimental energy levels of these nuclei. From the analysis of potential-energy surface in the CHF calculations, we found shape transition from prolate to oblate deformation in these N=Z nuclei and oblate-prolate coexistence at {sup 68}Se. The ground state of {sup 68}Se has an oblate shape, while the shape of {sup 60}Zn and {sup 64}Ge are prolate. It is shown that the isovector matrix elements between f{sub 5/2} and p{sub 1/2} orbits cause the oblate deformation for {sup 68}Se, and four-particle four-hole (4p-4h) excitations are important for the oblate configuration.

• OSTI ID: 20695709
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 70, Issue 5; Other Information: DOI: 10.1103/PhysRevC.70.051301; (c) 2004 The American Physical Society; 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
DEFORMED NUCLEI
EXCITATION
GERMANIUM 64
GROUND STATES
HARTREE-FOCK METHOD
ISOVECTORS
KRYPTON 72
MATRIX ELEMENTS
NUCLEAR DEFORMATION
NUCLEAR ELECTRIC MOMENTS
PARTICLE-HOLE MODEL
POTENTIAL ENERGY
QUADRUPOLES
RESIDUAL INTERACTIONS
SELENIUM 68
SHELL MODELS
ZINC 60