Evidence on {Delta}I=4 bifurcation in ground bands of even-even nuclei and the theoretical explanation with the interacting boson model

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.1821· OSTI ID:542701

Wu, L; Toki, H ^[1]

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1. Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567 (Japan)

All the data available for the ground rotational bands of even-even actinide nuclei and rare-earth nuclei (with band crossing spins I{sub c}{ge}16 ) are studied in terms of the staggering parameter, introduced in the discussion of superdeformed bands. Evidence of {Delta}I=4 bifurcation ({Delta}I=2 staggering) is observed in many cases. We study theoretically this bifurcation phenomenon in terms of the interacting boson model (IBM) by using the variation before projection (VBP) method. In our theoretical framework, the staggering phenomenon is found to originate from the finite boson number effect. The IBM explains the opposite signs of the staggering patterns between two neighboring nuclei, which are found experimentally. We perform also the full diagonalization of the IBM Hamiltonian and obtain consistent results with the VBP method. By introducing the g bosons, we are able to reproduce even irregular or localized staggering patterns in the {Delta}I=4 bifurcation spectrum observed in some data. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 542701
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 4 Vol. 56; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BENDING
BIFURCATION
EVEN-EVEN NUCLEI
GROUND STATES
INTERACTING BOSON MODEL
PLUTONIUM 236
PLUTONIUM 238
RARE EARTH NUCLEI
SPIN
SUPERDEFORMED NUCLEI
THORIUM 230
THORIUM 232
URANIUM 236
URANIUM 238