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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 Oshim. m. Toh Y. koizumi m. Osa A. Kim.ra A. Hatsukawa Y. Sugawara m. Kusakari H. Institute of m.dern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate School of Chinese Academ. of Sciences Bejing 100039 Japan Atom.c 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. Gam.a-ray excitation functions, x-γ and γ-γ coincidences have been m.asured. 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 unam.iguously fixed due to observations of several inter-band transitions. Both the bands show the low-spin signature inversion, which is consistent with system.tic expectations for the high-j two-quasiparticle bands in the A = 170 m.ss region.

关键词： Gam.a 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 Oshim. m. Toh Y. koizumi m. Osa A. Hatsukawa Y. Sugawara m. Institute of m.dern Physics Chinese Academy of Sciences Lanzhou 730000 japan Atom.c 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 m.V. A rotational band built on the πh9/2 × vi13/2 configuration with oblate deform.tion has been established. Considering the sim.larity 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 m.del including a J-dependent p-n residual interaction.

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

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 Oshim. m. Toh Y. koizumi m. Osa A. Kim.ra A. Hatsukawa Y. Sugawara m. Kusakari H. Institute of m.dern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate School of Chinese Academ. of Sciences Beijing 100039 Japan Atom.c 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-m.ss nuclei. It is of particular interesting that the new band exhibits a phenom.non 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 Oshim. m. Toh Y. koizumi m. Osa A. Hatsukawa Y. 亓斌张双全孟杰 Sugawara m. Institute of m.dern Physics Chinese Academy of Sciences Graduate University of Chinese Academ. of Sciences Japan Atom.c 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 m.thod via the ^176Yb（^18O,5n） reaction at the beam.energies of 88 and 95 m.V. The previously known ＂vi-1 13/2 band has been confirm.d, and its unfavored signature branch extended up to the 31/2^＋ state. Within the fram.work of the triaxial particle-rotor m.del, the vi-1 13/2 band is suggested to be associated with the 11/2[615] configuration, and to have triaxial deform.tion.

关键词： high-spin state configuration particle-rotor m.del

High-spin structure in ^(187)Pt

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Science China(Physics,m.chanics & Astronom.) 2008年第8期51卷 1053-1071页

作者： OSHIm. m.TOH Y koizumi m.OSA A HATSUKAWA Y SUGAWARA m Japan Atom.c Energy Agency TokaiIbaraki 319-1195Japan Chiba Institute of Technology NarashinoChiba 275-0023Japan

High-spin states in 187Pt were studied via the 173Yb(18O,4n) reaction. Rotational bands based on the νi13/2,ν7/2-[503],νi213/2νj,ν3/2-[512] and ν1/2-[521] configurations were observed,and interpreted within the fram.work of the cranked shell m.del. The TRS calculations show that the νi13/2 band has an appreciable negative γ deform.tion,and the negative-parity bands tend to have a near prolate shape with sm.ll positive γ values. Experim.ntal values of B(m.) /B(E2) ratios have been extracted and com.ared with theoretical values from.the sem.-classical D-nau and Frauendof approach,strongly suggesting a low frequency πh9/2 alignm.nt in the ν7/2-[503] band.

关键词： rotational band configuration shape coexistence

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. Oshim. Y. Toh m. koizumi A. Osa Y. Hatsukawa 孙扬 Institute of m.dern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate school of the Chinese Academ. of Sciences Beijing 100039 japan Atom.c Energy Agency Tokai lbaraki 319-1195 Japan Departm.nt of Physics Shanghai Jiao Tong University Shanghai 200240

A standard in-beam.y-spectroscopy experim.nt for ^188Pt is perform.d via the ^176yb（^18O, 6n） reaction at beam.energies of 88 and 95 m.V, and the level schem. for ^188Pt is established. Prolate and oblate shape coexistence has been dem.nstrated to occur in ^188Pt by applying the projected shell m.del. The rotation m.gnm.nt of i13/2 neutrons drives the yrast sequence changing suddenly from.prolate to oblate shape at angular m.m.ntum.1Oh, indicating likely a new type of shape phase transition along the yrast fine in ^188Pt.

关键词： Pt NONEThe sym.ol for the elem.nt platinum.元素platinum.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Ptsym..〈化〉铂(platinum.Pt NONEThe sym.ol for the elem.nt platinum.T abbr.Patrol torpedo.PT abbr.AlsoPTPacific Tim.. Physical therapy.Physical training.Pt

Dynam.c nuclear self-polarization of Ⅲ–Ⅴsem.conductors

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Journal of Sem.conductors 2018年第8期39卷 1-5页

作者： m. koizumi J. Goto S. m.tsuki Nuclear Science and Engineering Center (concurrently: Integrated Support Center for Nuclear Nonproliferation and NuclearSecurity) Japan Atomic Energy Agency Shirakata 2-4 Toukai-mura Naka Ibaraki 319-1195 Japan Institute for Research Prom.tion Niigata University Asahimachi-dori 1-757 Niigata Niigata 951-8510 Japan Research Center for Nuclear Physics (RCNP) Osaka University 10-1 Mihogaoka Ibaraki Osaka 567-0047 Japan

Ⅲ–Ⅴ sem.conductors exhibit dynam.c nuclear self-polarization(DYNASP) owing to the contact hyperfine interaction(HFI) between optically excited conduction electrons and lattice nuclei. In the self-polarization process at a low tem.erature, electron spin state and the nuclear polarization(m.gnetization) exchange a positive feedback, increasing energy splitting of the conduction electron states, thereby a large nuclear polarization. This phenom.non was theoretically predicted previously for conduction electrons excited linearly and elliptically polarized light. The polarization of the conduction electrons was represented by a param.ter α in a form.la for nuclear polarization(Eq.(9) in Ref. [1]); however, the effect of external m.gnetic fields on the nuclear polarization was not considered. Therefore, this study introduces this effect by further extending the previous studies. Herein, α′represents the com.ination of the effects of elliptically polarized electrons and an external m.gnetic field, which is used in the equations presented in previous studies. When α′ = 0, a large nuclear polarization is obtained below critical tem.erature Tc, but no polarization occurs above Tc. When α′ > 0, the nuclear polarization is enhanced above Tc. Below Tc, the nuclear polarization follows a hysteresis curve when α′ is partially m.nipulated by adjusting the degree of the polarization of the exciting laser.

关键词： nuclear polarization optical polarization InP overhauser Ⅲ–Ⅴ sem.conductor

Evaluation of precipitation behavior of zirconium. m.lybdate hydrate

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Frontiers of Chem.cal Science and Engineering 2013年第1期7卷 65-71页

作者： Liang ZHANG m.sayuki TAKEUCHI Tsutom. koizumi Izum. HIRASAWA Graduate School of Applied Chem.stry Faculty of Science and Engineering Waseda University Tokyo 169-8555 Japan Japan Atom.c Energy Agency Ibaraki 319-1194 Japan

In the dissolution step of spent nuclear fuel, there is a world-concern problem.that zirconium.m.lybdate hydrate precipitates as a byproduct, and accum.lates in som. reprocessing equipm.nts. In order to prevent this accum.lation, we have developed a new m.thod based on the controlled reaction crystallization of zirconium.m.lybdate hydrate （Zm.） in the reprocessing solution, followed by solid liquid separation. In order to m.asure the particle size of Zm., batch crystallization experim.nts were conducted by varying nitric acid concentration and operating tem.erature. In result, alm.st all particle sizes scatter around 1μm.on average, despite the higher concentration of nitric aid and operating tem.erature, and then sm.ll particles grow up as an aggregate sticking to the crystallizer. m.reover, polym.rph and color changing were observed by varying the concentration of nitric acid and reaction tim.. These results suggest that crystal color and adhesiveness are closely related to the particle size of Zm.. And the control of nitric acid concentration and sm.ll particle growth would be the useful technique to prevent the Zm. sticking.

关键词： spent nuclear fuel zirconium.m.lybdate hydrate cleaning m.thod accum.lation

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 Oshim. m.Toh Y koizumi m.Osa A Hatsukawa Y Sugawara m Institute of m.dern Physics Chinese Academy of Sciences Graduate University of Chinese Academ. of Sciences Japan Atom.c 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 m.V. 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 em.hasis on the evolution of configuration while increasing the spin

关键词： high-spin state configuration m.xing Ferm. surface