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COMMENTS ON THE HIGH SPIN SPECTROSCOPY OF ^(163)Lu

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Chinese Physics Letters 1990年第11期7卷 481-484页

作者： chen yongshou YANG Chunxiang Institute of Atomic Energyt Beijing 102413

The new striking feature of anomalously low second band crossing frequency observed in 163Lu is interpreted as the shape variation with,the quasiparticle(q.p.)configurations as a resuft of the deformation driving of the rotating ***-j orbits・On the assumption that the crossing frequency is basically determined by an average over deformations before and after tke crossing,tke experimental data is reproduced very well by tke present model calculation.

关键词： calculation rotating assumption

GIANT DIPOLE RESONANCES BUILT ON SUPERDEFORMED STATES IN Dy NUCLEI

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Chinese Physics Letters 1990年第4期7卷 166-169页

作者： chen yongshou DONG Baoguo LI Zhuxia Institute of Atomic Energy Beijing 102413

The properties of the Superdeformed giant dipole resonance(SDGDR)in rotating 146-152Dy even nuclei are studied based on the linear response theory with the self-consistently determined,superdeformed mean *** obtained ... 详细信息

关键词： field rotating dipole

Negative Drive of γ Deformation in Rapidly Rotating N=88,90 Nuclei

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Chinese journal of nuclear physics 1994年第1期16卷 77-84页

作者： chen, yongshou Riedinger, L.L. China Inst of Atomic Energy Beijing China

In the N=88,90 region,a strong negative drive of γ deformation is generatedby the second lowest positive signature vi13/2 quasiparticle *** contrast,thelowest positive-parity and negative-parity orbitals in this region exhibit positive drivesin the γ deformation toward oblate *** one of these with the negativedrive orbital strengthens the collectivity for the side band configurations at very highspins.

关键词： Yrast rotational band Angular momenta Prolate-oblate barrier

Projected total energy surface description for axial shape asymmetry in ^(172)W

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Science China(Physics,Mechanics & Astronomy) 2014年第11期57卷 2054-2059页

作者： TU Ya chen yongshou GAO ZaoChun YU ShaoYing LIU Ling College of Physics Science and Technology ShenYang Normal University China Institute of Atomic Energy School of Science Huzhou Teachers College

The projected total energy surface(PTES)approach has been developed based on the triaxial projected shell model(TPSM)hybridized with the macroscopic–microscopic *** total energy of an atomic nucleus is decomposed into macroscopic,microscopic and rotational *** macroscopic and microscopic components are described with the liquid drop model and Strutinsky method,respectively,and the rotational energy is given by the TPSM,the term beyond the mean *** test theory,the PTES calculations have been carried out for the yrast states of the well deformed rare earth nucleus172W,and the theoretical results are in good agreement with the experimental *** using the equilibrium quardrupole deformations(ε2andγ)determined by the PTES,the calculation of the transition quardrupole moment(Qt)in function of spin also reproduces the experimental data.A comparison between the PTES and TRS methods has been made for theoretical and application uses.

关键词： triaxial nucleus deformed rotational projected microscopic asymmetry macroscopic pairing nuclei

Nuclear uncertainties in the s-process simulation

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Science China(Physics,Mechanics & Astronomy) 2013年第5期56卷 859-865页

作者： ZHANG YouJin chen yongshou GUO JianYou HOU SuQing LI ZhiHong SHI JianRong School of Physics and Material Science Anhui University China Institute of Atomic Energy Institute of Modern Physics Chinese Academy of Sciences National Astronomical Observatories Chinese Academy of Sciences

The heavy elements in the Universe are formed during the s- and r-processes mainly in AGB stars and supernovae, respectively. Simulation of s- and r-nucleosynthesis critically depends on the neutron capture and weak decay rates for all the nuclei on the reaction chain. The present work analyzes systematically the neutron capture rates (cross sections) for the s-process nuclei, including ～3000 rates on ～200 nuclei. The network calculations for the constant temperature s-process have been performed using the different data sets selected as the nuclear inputs to investigate the uncertainties in the predicted s-abundances. We show that the available cross sections of neutron capture on many s-process nuclei still carry large uncertainties, which lead to low accuracy in the determination of s-process isotope abundances. We analyze the neutron capture cross section data for the same unique isobar nucleus accorded by year from previous work. Such an analysis indicates that the s-process has been studied for more than fifty years and there exist two research stages around 1976 and 2002, respectively. The needs and opportunities for future experiments and theoretical tools are highlighted to remove the existing shortcomings in the neutron capture rates.

关键词： nucleosynthesis neutron capture reaction s-process nuclear reaction network

The Cranking Shell Model Analysis for the Yrast Band of ^(87)Nb

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Chinese Physics Letters 1992年第3期9卷 123-126页

作者： LUO Wendong chen yongshou China Institute of Atomic Energy Beijing 102413 Institute of Theoretical Physics Academia SinicaBeijing 100080

The back bending phenomenon observed in ^(87)Nb is interpreted very well within the approach of the triaxial cranking shell model(CSM)with the deformations determined by a total routhian surface calculation which includes the deformation drive of the high j quasiparticle *** is suggested that the CSM is still valid for slightly deformed transitional nuclei if the configuration dependence of deformations is taken into account properly.

关键词： Crank properly deformed

Overview of Type 2 Diabetes Drugs on the Market

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Journal of Biosciences and Medicines 2020年第8期8卷 1-14页

作者： Yuxi Hu yongshou chen Center for Drug Evaluation National Medical Products Administration Beijing China Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan China

Type 2 Diabetes Mellitus (T2DM) is a systemic metabolic disorder with complex pathogenesis. In recent years, a variety of new T2DM drugs have emerged, such as sodium-dependent glucose transporters 2 (SGLT-2) inhibitors, glucagon-like peptide-1 (GLP-1) receptor agonists and dipeptidyl peptidase-4 (DPP-4) inhibitors. As traditional medicines, insulin also has developed kinds of formulations such as quick-acting or premixed insulin. In addition, new treatment schedules combining multiple drugs are also fully explored. The efficacy, the administration, the mechanism, the safety and the price of these drugs are all different, providing patients with multiple options. This paper reviews the main types of type 2 diabetes drugs on the market and describes the mechanism of action. The representative type 2 diabetes treatment drugs are listed, and the advantages and disadvantages of these representative drugs are preliminarily evaluated. This information is reviewed to help doctors with clinical medication.

关键词： Type 2 Diabetes Mellitus Insulin Sodium-Dependent Glucose Transporters 2 Glucagon-Like Peptide-1

Dramatic transition between electric and magnetic rotations in ^(106)Ag

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Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1669-1675页

作者： ZHENG Yun ZHU LiHua chen yongshou WU XiaoGuang HE ChuangYe HAO Xin LIU Ying WANG ZhiMin LI XueQin LI GuangSheng GAO ZaoChun SUN HuiBin China Institute of Atomic Energy School of Physics and Nuclear Energy Engineering Beihang University Faculty of Science Shenzhen University School of Environmental and Biological Engineering Nanjing University of Science and Technology Nuclear and Radiation Safety Center Ministry of Environmental Protection

The lifetimes for the states of magnetic dipole band in106Ag have been measured using the Doppler-shift attenuation method via the reaction of100Mo(11B,5n)106Ag at a beam energy of 60 *** reduced transition strengths of the magnetic dipole band,the B(M1)/B(E2)ratios together with the signature of the level energy as a function of angular momentum for the positive parity states of106Ag show that a drastic change of excitation mode,that is,from electric rotation to magnetic rotation,occurs within one unit of spin at around Iπ=12+.Theoretical calculations based on the triaxial projected shell model consistently reproduce the experimental data and provide an explanation on the nature of observed phenomena such that the dynamical drift of the rotational axis suddenly from the principal axis to the tilted one,along the positive parity bands of106Ag.

关键词： lifetime measurements DSAM TPSM magnetic rotation electric rotation

Empirical formula for β^--decay half-lives of r-process nuclei

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Science China(Physics,Mechanics & Astronomy) 2017年第8期60卷 21-27页

作者： Yong Zhou ZhiHong Li YouBao Wang yongshou chen Bing Guo Jun Su YunJu Li ShengQuan Yan XinYue Li ZhiYu Han YangPing Shen Lin Gan Sheng Zeng Gang Lian WeiPing Liu China Institute of Atomic Energy

Experimental data ofβ--decay half-lives of nuclei with atomic number between 20 and 190 are investigated.A systematic formula has been proposed to calculateβ^--decay half-lives of neutron-rich nuclei,with a particular consideration on shell and pair effects,the decay energy Q as well as the nucleon numbers(Z,N).Although the formula has relatively few parameters,it reproduces the experimentalβ^--decay half-lives of neutron-rich nuclei very *** predicted half-lives for the r-process relevant nuclei obtained with the current formula serve as reliable input in the r-process model calculations.

关键词： β--decay half-lives neutron-rich nuclei r-process