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High-Spin States in the N = 50 Nucleus ^(88)Sr

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Chinese Physics Letters 2001年第7期18卷 894-896页

作者：刘忠 T.Ishii T.Hayakawa m.oshima Y.Toh H.Sakurai m.Notani m.Ishihara Institute of modern Physics Chinese Academy of SciencesLanzhou 730000 Japan Atomic Energy Research Institute TokaiIbaraki 319-1195Japan The Institute of Physical and Chemical Research WakoSaitama 351-0198Japan

The Excited states of ^(88)Sr have been produced in the reaction ^(16)O(^(82)Se,4p6n)and studied using the in-beam γ spectroscopy *** high-spin level structures have been observed and established up to 8.5 meV and 7.9 meV excitation energy,*** on the measurements of the directional correlations ofγ-rays de-exciting oriented states and anisotropic factors ofγ-rays,spin values of the excited states have been assigned up to the highest levels observed.

关键词： states excited excitation

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

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

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

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 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

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