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Structure evolution along the yrast-line in ^(101)Pd

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Chinese Physics C 2010年第10期34卷 1598-1601页

作者：周厚兵周小红张玉虎 Oshima M. Toh y. Koizumi M. Osa A. hatsukawa y Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Japan Atomic Energy Agency TokaiIbaraki 319-1195Japan

High-spin states in ^101Pd have been investigated experimentally via the ^76Ge（^28Si, ^3nγ）^101pd reaction. The previously known bands based on the d5/2 and h11/2 neutron orbitals have been extended to higher-spin states, and two new structures have been observed. Spin and parity were assigned to the levels on the basis of the experimental results of the angular distribution of y rays deexciting the oriented states. For the ground-state band, the E-COS （E-Gamma Over Spin） curve strongly suggests a structure transition from vibration to rotation while increasing spin.

关键词： high-spin state E-GOS curve structure evolution

Prolate and Oblate Shape Coexistence in ^188Pt

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Chinese Physics Letters 2008年第5期25卷 1633-1635页

作者：刘渊周小红张玉虎郑勇柳敏良郭应祥 M. Oshima y. Toh M. Koizumi A. Osa y. hatsukawa 孙扬 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate school of the Chinese Academy of Sciences Beijing 100039 japan Atomic Energy Agency Tokai lbaraki 319-1195 Japan Department of Physics Shanghai Jiao Tong University Shanghai 200240

A standard in-beam y-spectroscopy experiment for ^188Pt is performed via the ^176yb（^18O, 6n） reaction at beam energies of 88 and 95 MeV, and the level scheme for ^188Pt is established. Prolate and oblate shape coexistence has been demonstrated to occur in ^188Pt by applying the projected shell model. The rotation Mignment of i13/2 neutrons drives the yrast sequence changing suddenly from prolate to oblate shape at angular momentum 1Oh, indicating likely a new type of shape phase transition along the yrast fine in ^188Pt.

关键词： Pt NONEThe symbol for the element platinum 元素platinum的符号PT (略语)也作PT太平洋时间 Physical therapy.体育锻炼PT abbr.Patrol torpedo.巡游鱼雷Pt【化】元素铂(platinum)的符号Ptsymb.〈化〉铂(platinum)Pt NONEThe symbol for the element platinumPT abbr.Patrol torpedo.PT abbr.AlsoPTPacific Time. Physical therapy.Physical training.Pt

Observation of High-j Two-Quasiparticle Bands in Odd-Odd ^174Re

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Chinese Physics Letters 2005年第11期22卷 2788-2791页

作者：张玉虎郭松周小红马龙 Oshima M. Toh y. Koizumi M. Osa A. Kimura A. hatsukawa y. Sugawara M. Kusakari H. Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate School of Chinese Academy of Sciences Bejing 100039 Japan Atomic Energy Research Institute Tokai-mura Ibaraki 319-1195 Japan Chiba Institute of Technology Narashino Chiba 275-0023 Japan Chiba University Inage-ku Chiba 263-8512 Japan

High spin states in ^174Re have been investigated via the ^152Sm （^27 Al, 5nγ） ^174Re reaction. Gamma-ray excitation functions, x-γ and γ-γ coincidences have been measured. Two rotational bands built on the πh9/2 × vi13/2 and πh11/2 × vi13/2 configurations have been identified and extended up to high-spin states. The relative spin and parity of the band levels have been unambiguously fixed due to observations of several inter-band transitions. Both the bands show the low-spin signature inversion, which is consistent with systematic expectations for the high-j two-quasiparticle bands in the A = 170 mass region.

关键词： Gamma rays

Properties of the πh9/2 × vi13/2 Oblate Band in ^188Tl

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Chinese Physics Letters 2006年第7期23卷 1727-1730页

作者：马龙周小红邢烨炳张玉虎郭应祥雷相国谢成营 Oshima M. Toh y. Koizumi M. Osa A. hatsukawa y. Sugawara M. Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 japan Atomic Energy Research Institute Tokai Ibaraki 319-1195 Japan Chiba Institute of Technology Narashino Chiba 275-0023 Japan

High spin states in ^188Tl have been investigated via the 157Gd（^35Cl,4n） reaction at beam energy of 170 MeV. A rotational band built on the πh9/2 × vi13/2 configuration with oblate deformation has been established. Considering the similarity between the band structure observed in odd-odd Tl nuclei, spin values have been tentatively proposed for the new band in ^188Tl. The πh9/2 × vi13/2 oblate band in ^188Tl shows low-spin signature inversion, and it can be interpreted qualitatively by the two quasiparticle plus rotor model including a J-dependent p-n residual interaction.

关键词： πh9/2νi13/2 Oblate 188Tl interpreted qualitatively

Properties of the ν7/2^-[503](f_(7/2)) band in ^(185)Pt

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Chinese Physics C 2011年第5期35卷 441-444页

作者：李广顺周小红张玉虎周厚兵滑伟王世陶丁兵王海霞 Oshima M Toh y Koizumi M Osa A hatsukawa y Sugawara M Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Japan Atomic Energy Agency Chiba Institute of Technology

High-spin states in 185Pt have been reinvestigated via the reaction 173yb（16O, 4n） at a beam energy of 90 MeV. The previously known band based on the ν7/2-[503]（f7/2） Nilsson orbital has been extended to higher spin states. Properties of the ν7/2-[503]（f7/2） band have been discussed with an emphasis on the evolution of configuration while increasing the spin

关键词： high-spin state configuration mixing Fermi surface

High-spin states in ^(190)Pt

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Chinese Physics C 2008年第1期32卷 31-33页

作者：马龙周小红 M.Oshima y.Toh 张玉虎郭应祥雷相国 M.Koizumi A.Osa T.Hayakawa y.hatsukawa T.Shizuma M.Sugawara Institute of Modern Physics Chinese Academy of Sciences Japan Atomic Energy Research Institute.Tokai Ibaraki 319-1195 Japan Japan Atomic Energy Research Institute Tokai Ibaraki 319-1195Japan Chiba Institute of Technology Narashino Chiba 275-0023Japan

The level structure of ^19Opt has been studied experimentally using the ^176yb （^18O, 4n） reaction at beam energies of 88 and 95 MeV. γ-γ-t coincidence measurements were carried out. Based on the analysis of T-T coincidence relationships, the level scheme of ^190Pt is extended to high-spin states. A new structure built on the 3413.6 keV 14＋ state has been observed, and the ＂vi13/2^-2 vh9/2^-1 vj （j = P3/2 or f5/2） configuration is tentatively assigned to it.

关键词： γ-γcoincidence γ-ray spectroscopy DCO ratio

Doubly Decoupled Structure in Odd-Odd ^(178-186)Ir Nuclei

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Chinese Physics Letters 2001年第1期18卷 27-29页

作者： ZHANG yu-Hu T.Hayakawa M.Oshima y.Toh J.Katakura y.hatsukawa M.Matsuda N.Shinohara T.Ishii H.Kusakari M.Sugawara T.Komatsubara Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 Japan Atomic Energy Research Institute TokaiIbaraki 319-1195Japan Chiba University Inage-kuChiba 263-8512Japan Japan Chiba Institute of Technology NarashinoChiba 275-0023Japan Institute of Physics and Tandem Accelerator Center University of TsukubaIbaraki 305-0006Japan

High-spin states in 178'180Ir have been studied via the 152'154Sm(31P,5nγ)reactions through excitation functions,x-γandγ-γ-t coincidence measurements.A doubly decoupled band has been identified in each of the *** level spacings for such structures in odd-odd ^(178-186)Ir have been inspected and thus a regular level staggering as a function of the neutron number is *** particular phenomenon may be associated with bandmixing at lower excitation energies.

关键词： excitation coincidence

Identification of a New Band and Its Signature Inversion in ^174Re

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Chinese Physics Letters 2007年第5期24卷 1203-1206页

作者：张玉虎郭松周小红马龙郭文涛 Oshima M. Toh y. Koizumi M. Osa A. Kimura A. hatsukawa y. Sugawara M. Kusakari H. Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate School of Chinese Academy of Sciences Beijing 100039 Japan Atomic Energy Agency Tokai-Mura Ibaraki 319-1195 Japan Chiba Institute of Technology Narashino Chiba 275-0023 Japan Chiba University Inage-ku Chiba 263-8512 Japan

High spin states in ^174Re are investigated via the ^152Sm（^27 AL,5nγ）^174Re reaction and γ - γ coincidence relationships are analysed carefully. A new band is identified due to its spectroscopic connection with the known π1/2^-[541] × ν1/2^-[521] band. This band is proposed to be the ground-state band built on the π1/2^-[541]× ,ν5/2^-[512] configuration in view of the low-lying intrinsic states in the neighbouring odd-mass nuclei. It is of particular interesting that the new band exhibits a phenomenon of low-spin signature inversion, providing a new situation for theoretical investigations.

关键词： ^174Re^174Re

Study of the νi_(13/2)^(-1) band in ^(189)Pt

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Chinese Physics C 2009年第9期33卷 743-747页

作者：滑伟周小红张玉虎郭应祥 Oshima M. Toh y. Koizumi M. Osa A. hatsukawa y. 亓斌张双全孟杰 Sugawara M. Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Japan Atomic Energy Agency School of Physics and State-Key Lab. Nucl. Phys. & Tech. Peking University Chiba Institute of Technology Narashino

High-spin levels of ^189Pt have been studied with the in-beam T-spectroscopy method via the ^176yb（^18O,5n） reaction at the beam energies of 88 and 95 MeV. The previously known ＂vi-1 13/2 band has been confirmed, and its unfavored signature branch extended up to the 31/2^＋ state. Within the framework of the triaxial particle-rotor model, the vi-1 13/2 band is suggested to be associated with the 11/2[615] configuration, and to have triaxial deformation.

关键词： high-spin state configuration particle-rotor model