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AbstractAbstract
[en] The phenomenon of identical bands is studied by analyzing the distributions of fractional changes in the dynamical moments of inertia of pairs of bands in superdeformed (SD) nuclei. These distributions are found to exhibit a peak with a centroid at nearly zero. Their widths increase in going from the SD bands in the mass A ∼ 150, to the SD bands in the mass ∼190 and to the normally-deformed bands in the rare-earth region. These differences may be attributed to the weaker pairing correlations and the stabilizing role of intruder orbitals on the structures of SD bands. Precise level lifetimes have been measured for various pairs of identical SD bands in Gd and Dy isotopes. By comparing the derived quadrupole moments with calculations performed in the framework of the cranking Skyrme-Hartree-Fock model, it is shown that, independently of the intrinsic configuration and of the proton and neutron numbers, the charge moments calculated with respect to the doubly-magic SD core of 152Dy can be expressed in terms of independent contributions from the individual hole and particle orbitals. (author)
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Exotic Nuclear Shapes. Pt. 1; Debrecen (Hungary); 12-17 May 1997; 42 refs.
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Singh, Balraj; Zywina, Roy; Firestone, Richard B.
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States). Funding organisation: USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of Nuclear Physics (United States); Natural Sciences and Engineering Research Council (NSERC) of Canada (United States)2002
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States). Funding organisation: USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of Nuclear Physics (United States); Natural Sciences and Engineering Research Council (NSERC) of Canada (United States)2002
AbstractAbstract
[en] The Table of Superdeformed Nuclear Bands and Fission Isomers contains all experimental data on the nuclear structure of superdeformed bands published through October, 2002. Level schemes, moment of inertia plots, and data tables are presented. A complete reference list is provided
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LBL--38004; B AND R KB0301042; AC03-76SF00098; Journal Publication Date: November, 2002
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Properties of superdeformed bands in A < 100 mass region within the variable moment of inertia model
Devi, Vidya; Matharu, Jagjit Singh, E-mail: matharujs@yahoo.com2021
AbstractAbstract
[en] The variable moment of inertia (VMI) model has been used to study the properties of superdeformed (SD) bands in A < 100 mass region. The experimental γ-ray (E γ) transitions energies are least square fitted to obtain the model parameters such as band head moment of inertia, (J 0), and stiffness constant, (C). The observed E γ transition energies obtained using the VMI formula are in excellent agreement with the experimental values. In the paper, we have studied the dynamic moment of inertia (J (2)) and its variation with rotational frequency (ℏ ω). We also studied the ΔI = 2 staggering phenomena in SD bands of 61Zn(SD), 62Zn(SD1), 80Sr(SD1), 81Sr(SD1), 82Sr(SD), 83Sr(SD), 84Zr(SD), 86Zr(SD1), 86Zr(SD4), 87Nb(SD2), 89Tc(SD) and 91Tc(SD) nuclei. The VMI model brings very comprehensive interpretation for spin assignment and to study the properties of SD bands in light mass region nuclei. (paper)
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Available from http://dx.doi.org/10.1088/1402-4896/abf18c; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Physica Scripta (Online); ISSN 1402-4896;
; v. 96(6); [10 p.]

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AbstractAbstract
No abstract available
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May 1998; [vp.]; Available from British Library Document Supply Centre- DSC:DXN021209; Thesis (Ph.D.)
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Miscellaneous
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Thesis/Dissertation
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AbstractAbstract
[en] An interconnection between quantum bifurcations and quantum phase transitions is investigated. It is shown that the quantum phase transition is the limiting case of the quantum bifurcation in macroscopic systems. Critical phenomena in microscopic many-body systems such as nuclei, molecules, etc. are described by quantum bifurcations. They are characterized by a large transition region, which conceals a critical point. Both the quantum bifurcation and quantum phase transition show that a change in the internal structure of a system manifests itself in the modification of its rotational spectrum. Such an intimate connection between internal and rotational motion allows a critical phenomenon to be established
[ru]
Исследуется взаимосвязь квантовых бифуркаций и квантовых фазовых переходов. Показано, что квантовый фазовый переход является предельным случаем квантовой бифуркации при переходе к макроскопической системе. Критические явлений в микроскопических многочастичных системах, таких, как ядра, молекулы и т.д., описываются квантовыми бифуркациями. Последние характеризуются переходной областью без ярко выраженной критической точки. Анализ квантовой бифуркации и квантового фазового перехода показывает, что изменение внутренней структуры системы сопровождается изменением ее вращательного спектра. Такая связь между внутренним и вращательным движением позволяет обнаружить критическое явлениеPrimary Subject
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25 refs., 3 figs.
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AbstractAbstract
[en] We discuss some characteristic features of the wobbling motion excited on the triaxial superdeformed Lu and Hf nuclei. We show these features are determined by the behavior of the moments of inertia
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Conference on nuclei at the limits; Argonne, IL (United States); 26-30 Jul 2004; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
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External URLExternal URL
Baktash, C.
Oak Ridge National Lab., TN (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1996
Oak Ridge National Lab., TN (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1996
AbstractAbstract
[en] A new island of superdeformed nuclei with major-to-minor axis ratio of 2:1 has recently been discovered in the A ∼ 80 medium-mass region, confirming the predictions for the existence of a large SD gap at particle number N,Z ∼ 44. The general properties of more than 20 bands observed so far will be reviewed here, and compared with those of the superdeformed bands in the heavier nuclei
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1996; 10 p; Conference on nuclear structure at the limits; Argonne, IL (United States); 22-26 Jul 1996; CONTRACT AC05-96OR22464; Also available from OSTI as DE97001652; NTIS; US Govt. Printing Office Dep
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Report
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AbstractAbstract
[en] Originally, random matrix theory (RMT) was designed by Wigner to deal with the statistics of eigenvalues and eigenfunctions of complex many-body quantum systems in 1950s. During the last two decades, the RMT underwent an unexpected and rapid development: The RMT has been successfully applied to an ever increasing variety of physical problems, and it has become an important tool to attack many-body problems. In this contribution I briefly outline the development of the RMT and introduce its basics. Its application to the decay out of a superdeformed band and a comparison of the approach used in Ref. 34 with that proposed by Vigezzi et al are presented. Current theoretical activities on the decay out problem are reviewed, and the influence of the degree of chaoticity of the normally deformed states on the decay out intensity is examined systematically. (author)
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International workshop on nuclear structure physics; Shanghai (China); 1-7 Jun 2008; Available from DOI: http://dx.doi.org/10.1142/S0218301308011938
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International Journal of Modern Physics E; ISSN 0218-3013;
; v. 17(supp.1); p. 292-303

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AbstractAbstract
[en] Within the supersymmetry scheme including many-body interactions and a perturbation possessing the SO(5) (or SU(5)) symmetry on the rotational symmetry, the superdeformed (SD) bands of the odd-A nuclei in A≅190 mass region are investigated systematically. Quantitatively good results of the γ-ray energy spectra and the dynamical moments of inertia are obtained. It shows that the supersymmetry approach is powerful in describing not only the generic rotational property , but also the ΔI=4 bifurcation and the identical bands in SD states simultaneously. (author)
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6 figs., 1 tab., 47refs.
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Journal Article
Journal
High Energy Physics and Nuclear Physics; ISSN 0254-3052;
; v. 28(10); p. 1055-1064

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Beck, F.A.; France, G. de; Prevost, D.
International nuclear physics conference. Book of abstracts. Invited and contributed papers1995
International nuclear physics conference. Book of abstracts. Invited and contributed papers1995
AbstractAbstract
[en] Short communication
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Source
Academia Sinica, Beijing, BJ (China). Inst. of Atomic Energy; [600 p.]; 1995; p. 6.2-39; INPC '95: International nuclear physics conference; Beijing (China); 21-26 Aug 1995
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