Shimizu Yoshifumi R. SHIMIZU Yoshifumi R.

Articles:  1-19 of 19

  • A Comment on the New Formulation of a Many-Level Shell Model

    YASUMOTO Seiichi , SHIMIZU Yoshifumi R. , TAKADA Kenjiro , Girls' High School of Kyushu International University , Department of Physics Kyushu University , Department of Physics Kyushu University

    In order to construct a set of orthonormalized basis vectors in a many-level shell model space, we introduced a new type of CFP in a previous paper. There, we also presented one of its analytic repres …

    Progress of Theoretical Physics 110(5), 1037-1041, 2003-11-25

    DOI  References (1)

  • Origin of Prolate Dominance of Nuclear Deformation

    TAJIMA Naoki , SHIMIZU Yoshifumi R. , SUZUKI Norifumi

    Changing the strengths of the spin-orbit and the l^2 terms of the Nilsson potential is found to be able to bring about a situation in which the majority of atomic nuclei bear oblate shapes at their gr …

    Progress of theoretical physics. Supplement (146), 628-629, 2002-12-26

    DOI  NDL Digital Collections  References (1)

  • Diabatic Mean-Field Description of Rotational Bands in Terms of the Selfconsistent Collective Coordinate Method

    SHIMIZU Yoshifumi. R. , MATSUYANAGI Kenichi

    Diabatic description of rotational bands provides a clear-cut picture for understanding the back-bending phenomena, where the internal structure of the yrast band changes dramatically as a function of …

    Progress of Theoretical Physics 141, 285-327, 2001-04-27

    DOI  NDL Digital Collections  References (71) Cited by (5)

  • Test of Validity of the Hermitian Treatment of the Dyson Boson Mapping

    SATO Motom , SHIMIZU Yoshifumi R. , TAKADA Kenjiro , Department of Physics Kyushu University , Department of Physics Kyushu University , Department of Physics Kyushu University

    The eigenvalue equation in the Dyson boson mapping is non-Hermitian. A method for a Hermitian treatment of this non-Hermitian eigenvalue equation has been proposed by one of the present authors. If we …

    Progress of Theoretical Physics 102(2), 287-296, 1999-08-25

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  • Tilted Axis Cranking Applied to a System of One-Quasiparticle Coupled to a Triaxial Rotor

    OTSUBO Shin-ichi , SHIMIZU Yoshifumi R. , Department of Physics Kyushu University , Department of Physics Kyushu University

    An extension of the cranking model allowing for the rotation axis to deviate from the principal axes of the deformed mean-field is a promising tool for the spectroscopic study of rapidly rotating nucl …

    Progress of Theoretical Physics 98(5), 1099-1121, 1997-11-25

    DOI  References (36)

  • Two-Octupole-Phonon States in <146,148>^Gd

    TAKADA Kenjiro , SHIMIZU Yoshifumi R. , Department of Physics Kyushu University , Department of Physics Kyushu University

    The so-called "two-octupole-phonon states" in ^<146,148>Gd are theoretically analyzad by using the Dyson boson mapping method. In our analyses, the free ground state of ^<146>Gd is treated …

    Progress of Theoretical Physics 95(6), 1121-1143, 1996-06-25

    DOI  References (16)

  • Mass Tensor for Decay out of Superdeformed Bands :

    SHIMIZU Yoshifumi R. , BARRANCO Francisco , VIGEZZI Enrico , BROGLIA Ricardo A.

    JJAP series 9, 164-167, 1993

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  • Soft Octupole Vibrations with K=0 and K≠0 Built on Superdeformed Rotational Bands and Static Pairing Correlations

    MIZUTORI S. , Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyushu University , Department of PhySics Kyoto University

    Properties of low-1ying octupole vibrations (with K=0, 1, 2 and 3) built on superdeformed rotational bands are investigated by means of the RPA in a uniformly rotating frame. Large configuration space …

    Progress of Theoretical Physics 86(1), p131-149, 1991-07

    DOI  Cited by (1)

  • Octupole Vibrations with K=1 and 2 in Superconducting,Superdeformed Nuclei

    MIZUTORI S. , Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyushu University , Department of Physics Kyoto University

    We calculate the response functions for octupole vibrations in superdeformed nuclei by means of the RPA using a large configuration space composed of 9 major shells. The strongly collective octupole v …

    Progress of Theoretical Physics 85(3), p559-566, 1991-03

    DOI  Cited by (1)

  • Decays of the Superdeformed rotational bands in the A &ap; 150 Region(New Trends in Nuclear Collective Dynamics)

    Shimizu Yoshifumi R. , Dossing Thomas , Vigezzi Enrico , Broglia Ricardo A.

    The mechanism of decays of the superdeformed rotational bands is studied as a barrier penetration problem by making use of microscopically calculated potential energy surfaces in the (ε_2, γ)-plane. T …

    Soryushiron Kenkyu Electronics 83(4), D119-D130, 1991

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  • Octupole Vibrations Built on Superdeformed Rotational Bands

    Shoujirou MIZUTORI , Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyushu University , Department of Physics Kyoto University

    Strength functions for giant octupole resonances built on the superdeformed rotational bands are calculated by means of the RPA based on the cranking model. It is suggested that strongly collective oc …

    Progress of Theoretical Physics 83(4), p666-670, 1990-04

    DOI 

  • NUCLEAR WOBBLING MOTION FROM MICROSCOPIC VIEWPOINT

    Shimizu Yoshifumi R. , Kisaka Toshihiro , Matsuzaki Masayuki

    The nuclear wobbling motion associated with the static triaxial deformation are investigated from a microscopic viewpoint. A relationship between the microscopic and macroscopic models is clarified. E …

    Soryushiron Kenkyu Electronics 81(6), F182-F192, 1990

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  • Quasiparticle-Vibration Couplings in Rotating Triaxial Odd-A Nuclei

    MATSUZAKI M. , Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyushu University , Department of Physics Kyoto University

    A new microscopic model which takes into account both the static and dynamic triaxial deformations in the high-spin states of odd-A nuclei is developed. The model is based on the rotating shell model …

    Progress of Theoretical Physics 79(4), p836-862, 1988-04

    DOI  Cited by (1)

  • Non-Unitary Realization of the Selfconsistent Collective-Coordinate Method

    Yoshifumi R. SHIMIZU , Kenjiro TAKADA , Department of Physics Kyushu University , Department of Physics Kyushu University

    Recently we reformulated the selfconsistent collective-coordinate (SCC) method of Marumori, Maskawa, Sakata and Kuriyama. In this reformulation, biunitary forms of state vectors are used and the resul …

    Progress of Theoretical Physics 77(5), p1192-1208, 1987-05

    DOI 

  • Monopole and Quadrupole Giant Resonances in Rotating Triaxially Deformed Nuclei-2-A Microscopic Description of the Isoscalar and Isovector Modes

    Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyoto University

    Microscopic calculations are performed for the isoscalar and isovector monopole and quadrupole giant resonances built on high-spin yrast state. The results of the calculation show that the shapes of t …

    Progress of Theoretical Physics 75(5), p1161-1175, 1986-05

    DOI 

  • Monopole and Quadrupole Giant Resonances in Rotating Triaxially Deformed Nuclei

    Yoshifumi R SHUMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyoto University

    Isoscalar monopole and quadrupole giant resonances in rotating triaxially deformed nuclei are studied by means of the RPA based on the rotating shell model. The deformation parameters are selfconsiste …

    Progress of Theoretical Physics 72(5), p1017-1035, 1984-11

    DOI 

  • Incipient Triaxial Deformations of the Rotation-Aligned Bands--Equilibrium Shapes Determined by the Isotropic Velocity Distribution Condition

    Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyoto University

    Shape changes of the rotation-aligned s-bands in Er isotopes are evaluated as functions of rotational frequency by requiring that average velocity distribution at equilibrium shall be isotropic in the …

    Progress of Theoretical Physics 71(5), p960-972, 1984-05

    DOI 

  • Residual Interactions between Aligned Quasiparticles and Pairing Deformation Changes in 165,166Yb and 164Er

    Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyoto University

    We explicitly evaluate the residual interactions between aligned quasiparticles that are associated with the decrease of the pairing deformation Δ. The result of analysis supports the suggestion by Ro …

    Progress of Theoretical Physics 70(1), p319-321, 1983-07

    DOI 

  • An Extension of the Rotating Shell Model and Its Application to 164Er

    Yoshifumi R. SHIMIZU , Kenichi MATSUYANAGI , Department of Physics Kyoto University , Department of Physics Kyoto University

    We develop an RPA approach based on rotating potentials as an extension of the rotating shell model of nuclear high-spin states. The RPA formalism is applied to the positive-party yrast spectrum of ^& …

    Progress of Theoretical Physics 70(1), p144-162, 1983-07

    DOI 

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