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

multi-quasiparticle excitations in ^(145)Tb

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Science China(Physics,mechanics & Astronomy) 2004年第5期47卷 561-570页

作者： T. Hayakawa m. Oshima T. Toh T. Shizuma J. Katakura Y. Hatsukawa m. matsuda H. Kusakari m. sugawara Japan Atomic Energy Research Institute Tokai Ibaraki 319-1195 JapanJapan Atomic Energy Research Institute Tokai Ibaraki 319-1195 JapanJapan Atomic Energy Research Institute Tokai Ibaraki 319-1195 JapanJapan Atomic Energy Research Institute Tokai Ibaraki 319-1195 JapanJapan Atomic Energy Research Institute Tokai Ibaraki 319-1195 JapanJapan Atomic Energy Research Institute Tokai Ibaraki 319-1195 JapanJapan Atomic Energy Research Institute Tokai Ibaraki 319-1195 JapanChiba University Inage-ku Chiba 263-8512 JapanChiba Institute of Technology Narashino Chiba 275-0023 Japan

High-spin states in 145Tb have been populated using the 118Sn (32S, 1p4n) reaction at beam energy of 165 meV. The level scheme of 145Tb has been established up to Ex ≈7.4 meV. The level scheme shows characteristics of a spherical or slightly oblate nucleus. Based on the systematic trends of the level structure in the neighboring N = 80 isotones, the level structure in 145Tb below 2 meV excitation is well explained by coupling an h11/2valence proton to the even-even 144Gd core. Above 2 meV excitation, most of the yrast levels are interpreted with multi-quasiparticle shell-model configurations.

关键词： high-spin states, level scheme, multi-quasiparticle excitations.

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

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

Systematic Properties of the 1／2[660]^i13／2 Bands in Odd-A Au Nuclei

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Chinese Physics Letters 2004年第7期21卷 1243-1246页

作者： SONGLi-Tao ZHOUXiao-Hong ZHANGYu-Hu GUOYing-Xiang SUNZhi-Yu m.Oshima T.Toh A.Osa m.Koizumi J.Katakura Y.Hatsukawa m.matsuda m.sugawara 1nstituteofmodernPhysics ChineseAcademyofSciencesLanzhou730000 JapanAtomicEnergyResearchInstitute TokaiIbaraki319-1195Japan ChibaInstituteofTechnology NarashinoChiba275-0023Japan

A standard in-beam γ-spectroscopy experiment for 179Au has been performed via the 149Sm (35Cl, 5n) reaction at beam energies of 164–180meV. Based on the analysis of the experimental results, a rotational band built on the 1/2[660](πi13/2) proton intruder orbital is established for 179Au for the first time. Systematic properties of the 1/2[660](i13/2) band in odd-A Au nuclei are discussed, and the evolution of bandhead energy and deformation with changing neutron number are revealed.

关键词： Ultraviolet spectroscopy

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

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(27Al,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 高速自旋状态能带分光镜

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：张玉虎 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

Search for Signature Inversion in the πi_(13/2) vi_(13/2) Band in Odd-Odd ^(178I)r

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Chinese Physics Letters 2001年第10期18卷 1323-1326页

作者：张玉虎 T.Hayakawa m.Oshima Y.Toh J.Katakura Y.Hatsukawa m.matsuda N.Shinohara T.Ishii H.Kusakari m.sugawara T.Komatsubara K.Furuno Institute of modern Physics:Chinese Academy of Sciences Lanzhou 7300002 Japan Atomic Energy Research Institute TokaiIbaraki 319-1195Japan Chiba University Inage-kuChiba 263-8512Japan Chiba Institute of Technology NarashinoChiba 275-0023Japan Institute of Physics and Tandem Accelerator Center University of TsukubaIbaraki 305-0006Japan

The search for the ri_(13/2) vi_(13/2 ) band in ^(178)Ir has been conducted through the ^(152)Sm(^(31) P, 5nγ)^( 178)Ir reaction and the excitation functions, x-γ and γ-γ-t coincidence measurements. Five rotational bands have been newly identified. The low-spin signature inversion in the πi13/2 vi13/2 band has been confirmed by the observations of linking transitions and signature crossing at I = 25.5 h. The inversion phenomenon in rh11/2 vi_(13/2), rh9/2 vi_(13/2) and ri_(13/2) vi13/2 structures in ^(178)Ir provides a unique testing ground for different theoretical interpretations.

关键词： signature Inversion