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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

Regularizing fuel-optimal multi-impulse trajectories

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Astrodynamics 2024年第1期8卷 97-119页

作者： Kenta oshima Department of mechanical Systems Engineering Hiroshima Institute of TechnologyHiroshima731-5193Japan

The regularization theory has successfully enabled the removal of gravitational singularities associated with celestial *** this study,regularizing techniques are merged into a multi-impulse trajectory design framework that requires delicate computations,particularly for a fuel minimization *** variables based on the Levi–Civita or Kustaanheimo–Stiefel transformations express instantaneous velocity changes in a gradient-based direct optimization *** formulation removes the adverse singularities associated with the null thrust impulses from the derivatives of an objective function in the fuel minimization *** favorite singularity-free property enables the accurate reduction of unnecessary impulses and the generation of necessary impulses for local optimal solutions in an automatic *** of fuel-optimal multi-impulse trajectories are presented,including novel transfer solutions between a near-rectilinear halo orbit and a distant retrograde orbit.

关键词： regularization trajectory optimization fuel minimization multi-impulse trajectory

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：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

Negative Parity Bands and Signature Splitting Inversion in ^80Rb

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Chinese Physics Letters 2003年第11期20卷 1932-1935页

作者：袁观俊杨春祥王月张振龙孟锐 m.oshima Y.Toh A.Osa m.Koizumi Y.Hatsukawa m.matsuda T.Hagakawa m.m.Ndontcheng 温书贤贺创业竺礼华王治民李广生马瑞刚吴晓光 DepartmentofPhysics JinlinUniversityChangchun130023 JapanAtomicEnergyResearchInstitute TokaiJapan DepartmentofPhysics UniversityofDoualaDoualaCameroun ChinaInstituteofAtomicEnergy Beijing102413

High spin states in 80Rb were studied via the 65Cu+19F, 66Zn+18O and 68Zn+16O reactions. The 75-meV 19F, 76-meV 18O and 80-meV 16O beams were provided by the CIAE HI-13 Tandem accelerator and the JAERI Tandem accelerator. The prompt γ-γ coincidence and the directional correlation from oriented nuclei (DCO) were measured by the detector arrays in CIAE and JAERI. Twenty-three new states with 28 new transitions have been assigned to 80Rb. The states were observed up to spins of 20+ and 22− in the α = 0 branch for the positive and negative parity yrast bands respectively. The negative parity non-yrast bands were significantly extended up to spins of 22− and 15−. The band crossings with frequencies 0.51meV and 0.61meV in the α = 0 cascade were observed for the first time. The signature splitting was observed in both negative parity bands. The signature inversions at spins of about 7 and 15 were observed.

关键词： HIGH-SPIN STATES

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：李仕成石跃张玉虎周小红许甫荣方永得柳敏良丁兵郭松李广顺周厚兵 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 ^(176)Ir

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ImP & HIRFL Annual Report 2001年第1期 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 TokaiIbaraki 319-1195Japan.Japan Atomic Energy Research InstituteTokaiIbaraki 319-1195Japan.Japan Atomic Energy Research InstituteTokaiIbaraki 319-1195Japan.Japan Atomic Energy Research InstituteTokaiIbaraki 319-1195Japan.Japan Atomic Energy Research InstituteTokaiIbaraki 319-1195Japan.Japan Atomic Energy Research InstituteTokaiIbaraki 319-1195Japan.Chiba UniversityInage-kuChiba 263-8512Japan.Chiba Institute of TechnologyNarashinoChiba 275-0023Japan.Department of PhysicsKyushu UniversityFukuoka 812-81Japan.

High-spin states of odd-odd^(176)Ir has been studied for the first time,by using^(149)Sm(^(31)P,4n)^(176)Ir ***^(31)P beam was provided by the JAERI(Japan Atomic Energy Research Institute)tandem *** target was an enri... 详细信息

关键词： accelerator coincidence enriched metallic Atomic tandem Observation transitions evaporation bands