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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

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

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

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： 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 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

High-spin structure in ^(187)Pt

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Science China(Physics,mechanics & Astronomy) 2008年第8期51卷 1053-1071页

作者： oshima m toh y koizumi m osa A hatsukawa y sugawara m Japan Atomic 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 framework of the cranked shell model. the tRS calculations show that the νi13/2 band has an appreciable negative γ deformation,and the negative-parity bands tend to have a near prolate shape with small positive γ values. Experimental values of B(m1) /B(E2) ratios have been extracted and compared with theoretical values from the semi-classical D-nau and Frauendof approach,strongly suggesting a low frequency πh9/2 alignment in the ν7/2-[503] band.

关键词： rotational band configuration shape coexistence

Identification of a New Four-Quasiparticle State in Odd-Odd 186Au

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Chinese Physics Letters 2012年第2期29卷 63-66页

作者： LI Shi-Cheng SHI yue ZHANG yu-Hu ZHOU Xiao-Hong XU Fu-Rong FANG yong-De LIU min-Liang DING Bing GUO Song LI Guang-Shun ZHOU Hou-Bing m.oshima y.toh m.koizumi a.osa A.Kimura y.hatsukawa H.hayakawa t.shizuma J.Katakura m.matsuda t.morikawa m.sugawara H.Kusakari Institute of modern Physics Chinese Academy of SciencesLanzhou 730000 Graduate University of Chinese Academy of Sciences Beijing 100049 School of Physics and State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871 Japan Atomic Energy Agency TokaiIbaraki 319-1195Japan Department of Physics Kyushu UniversityFukuoka812-81Japan Chiba Institute of technology NarashinoChiba 275-0023Japan Chiba University Inage-kuChiba 263-8512Japan

the high-spin level structure of 186 Au is re-investigated by means of in-beam γ-ray spectroscopy via the 172 yb(19 F,5nγ )186 Au *** oblate bands previously reported are revised and extended to higher-spin states.A new Iπ =(20+) excited state has been identified and assigned to the πh-111/2 (×) vi-213/2h-19/2 *** total Routhian surface and cranked shell model calculations suggest that the πh-111/2 (×) vi-213/2h-19/2 band in 186Au has a non-axial deformation.

关键词： configuration deformation reaction

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双奇核^(188)Au的准粒子带结构研究

高能物理与核物理 2006年第2期30卷 99-104页

作者：方永得张玉虎 m.oshima y.toh 周小红 m.koizumi a.osa A.Kimura y.hatsukawa t.morikawa m.Nakamura m.sugawara H.Kusakari 中国科学院近代物理研究所 Japan Atomic Energy Research Institute TokaiIbaraki 319-1195Japan Department of Physics Kyushu UniversityFukuoka 812-81Japan Chiba Institute of technology NarashinoChiba 275-0023Japan Chiba University Inage-kuChiba 263-8512Japan

利用在束γ谱学实验技术,通过173yb(19F,4nγ)反应布居了188Au的高自旋态,并对其准粒子带结构进行了研究．基于实验测量结果,对原有的双奇核188Au能级纲图做了较大的修改．通过系统性比较,对15+以上的能级结构进行了讨论．

关键词：在束γ谱学双奇核^188Au 高自旋态 γ形变

Observation of Rotational Bands in Odd-Odd 176Ir

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ImP & HIRFL Annual Report 2001年 41-42页

作者： m.oshima,y.toh,m.koizumi,a.osa,t.shizuma,t.Hayakalwa,m.sugawara,H.Kusakari,t.morikawa Japan Atomic Energy Research Institute tokai Ibaraki 319-1195 Japan. Japan Atomic Energy Research Institute tokai Ibaraki 319-1195 Japan. Japan Atomic Energy Research Institute tokai Ibaraki 319-1195 Japan. Japan Atomic Energy Research Institute tokai Ibaraki 319-1195 Japan. Japan Atomic Energy Research Institute tokai Ibaraki 319-1195 Japan. Japan Atomic Energy Research Institute tokai Ibaraki 319-1195 Japan. Chiba University Inage-ku Chiba 263-8512 Japan. Chiba Institute of technology Narashino Chiba 275-0023 Japan. Department of Physics Kyushu University Fukuoka 812-81 Japan.

High-spin states of odd-odd176Ir has been studied for the first time,by using149Sm(31P,4n)176Ir ***31P beam was provided by the JAERI（Japan Atomic Energy Research Institute）tandem *** target was an enriched149Sm met...

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形变双奇核^(178)Ir转动带能级的旋称反转

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高能物理与核物理 2000年第12期24卷 1123-1130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 中国科学院近代物理研究所兰州730000 Japan Atomic Energy Research Institute Chiba University Chiba Institute of technology Institute of Physics and tandem Accelerator Center

利用１５２Ｓｍ（３１Ｐ，５ｎγ）１７８Ｉｒ反应产生并研究了双奇核１７８Ｉｒ的高自旋态．实验中进行了１７８Ｉｒ核的在束 γ测量，包括γ射线的激发函数测量、Ｘ－γ和γ－γ符合测量．首次建立了双奇核１７８Ｉｒ基于πｈ９／２... 详细信息

利用１５２Ｓｍ（３１Ｐ，５ｎγ）１７８Ｉｒ反应产生并研究了双奇核１７８Ｉｒ的高自旋态．实验中进行了１７８Ｉｒ核的在束 γ测量，包括γ射线的激发函数测量、Ｘ－γ和γ－γ符合测量．首次建立了双奇核１７８Ｉｒ基于πｈ９／２νｉ１３／２和πｈ１１／２νｉ１３／２准粒子组态上的转动带能级纲图．发现在低自旋区，两个转动带能级均出现旋称反转．对此核区半退耦带的旋称反转作了简要的分析和讨论．

关键词：在束γ谱学形变双奇核转动带旋称反转