检索结果-南通市图书馆

Temporal variation of some fundamental constants in the narrow nuclear transition

在线全文

cnki会议

学校读者我要写书评

暂无评论

Temporal variation of some fundamental constants in the narr...

第十三届全国核物理大会暨第八届会员代表大会

作者： Xiao-tao He~1 Zhong-zhou Ren~(1,2) (Department of physics,Nanjing University,Nanjing 210093,china) (center of theoretical nuclear physics,national laboratory of heavy-ion accelerator,lanzhou 730000,china)

The very low energy and narrow width in some nuclear transitions have inspired the idea that these transition might be used to measure the temporal variation of some fundamental physical constants with great enhanced ... 详细信息

关键词： fundamental physical constants nuclear isomer state temporal variation

Production of dileptons with intermediate masses in an expanding quark-gluon matter

在线全文

cnki会议

学校读者我要写书评

暂无评论

nuclear Science and Techniques 2000年第3期11卷 183-186页

作者： HE Ze-Jun, JIANG Wei-Zhou, ZHOU Wen-Jie, ZHANG Jia-Ju (center of theoretical nuclear physics, the national laboratory of heavy ion accelerator, lanzhou 750000 Shanghai Institute of nuclear Research, the Chinese Academy of Sciences Shanghai 201800) 兰州原子核理论研究中心重离子加速器国家实验室甘肃兰州 730000 中科院上海原子核所上海 201800

A study of dilepton spectra, in intermediate mass region (IMR), from main background sources, quark phase, and secondary processes in hadronic phase on the basis of a relativistic hydrodynadric model has been carried out. The comparison between these results indicates that in this mass region the contribution from the background sources dominates, and due to the effect of the phase boundary on the evolution of the system the contribution from the quark phase becomes more important than that from secondary processes.

关键词：粒子物理学轻子流体动力学模型产物夸克胶子 IMR 强子

Light A physics in the lepton-specific two-Higgs doublet model

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2010年第11期53卷 1981-1987页

作者： CAO JunJie 1,HENG ZhaoXia 2,3 & WAN PeiHua 1 1 College of physics & Information Engineering,Henan Normal University,Xinxiang 453007,china 2 Key laboratory of Frontiers in theoretical physics,Institute of theoretical physics,Chinese Academy of Sciences,Beijing 100190,china 3 Kavli Institute for theoretical physics china,Chinese Academy of Sciences,Beijing 100190,china College of physics & Information Engineering Henan Normal University Xinxiang China Key laboratory of Frontiers in theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing China Kavli Institute for theoretical physics china Chinese Academy of Sciences Beijing China

We examine various direct and indirect constraints on the lepton-specific two-Higgs doublet model and discuss its phenomenology at colliders in the allowed parameter *** constraints we consider come from the precision electroweak data,the direct search for Higgs boson,the muon anomalous magnetic moment,as well as some theoretical consistency *** find that in the allowed parameter space the CP-odd Higgs boson A is rather light (m A 30 GeV with 95% possibility),which is composed dominantly by the leptonic Higgs and decays dominantly into τ + τ;while the SM-like Higgs boson h (responsible largely for electroweak symmetry breaking) decays dominantly in the mode h → AA → 4τ with a large decay width,which will make the Higgs discovery more difficult at the ***,this scenario predicts rare Z decays Z → AAA and Z →τ + τA with their branching ratios ranging from 10-8 to 10-and 10-5 to 10-4 respectively,which may be accessible at the GigaZ option of the ILC.

关键词： Lepton-specific two-Higgs doublt model light Higgs boson A Z decays

Systematic Study of Stability of Super heavy Nuclei

在线全文

学校读者我要写书评

暂无评论

Communications in theoretical physics 2004年第12期 871-874页

作者： ZHANG Hong-Fei,~(1,4) ZUO Wei,~(1,2,3) Soojae Im,~(1,2) ZHOU Xiao-Hong,~1 LI Jun-Qing~(1,2,3)~1Institute of Modern physics,the Chinese Academy of Sciences,lanzhou 730000,china~2center of theoretical nuclear physics,national laboratory of heavy ion accelerator of lanzhou,lanzhou 730000,china~3Institut f(?)r Theoretische Physik,Justus-Liebig-Universit(?)t,Heinrich-Buff-Ring 16,D 35392 Giessen,Germany~4Graduate School of the Chinese Academy of Sciences,Beijing 100039,china

A systematic overview on the characteristics of super heavy nuclei from Z=101 to Z=130 based on thedata by P.M(?)ller et *** *** nuclei which have the biggest mean binding energy in each of their isotopechain show systematic regular behavior,indicating that the mean binding energy is a good criterion to classify superheavy nuclei by their *** investigation on the nuclear data at and after Z=127 has been suggested.

关键词： superheavy nucles binding energy stability

Comparison of dark energy models:A perspective from the latest observational data

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国科学：物理学、力学、天文学英文版 2010年第9期53卷 1631-1645页

作者： LI Miao1,2,LI XiaoDong2,3 & ZHANG Xin1,4 1Kavli Institute for theoretical physics china,Chinese Academy of Sciences,Beijing 100190,china 2Key laboratory of Frontiers in theoretical physics,Institute of theoretical physics,Chinese Academy of Sciences,Beijing 100190,china 3Interdisciplinary center for theoretical Study,University of Science and Technology of china,Hefei 230026,china 4Department of physics,College of Sciences,Northeastern University,Shenyang 110004,china Kavli Institute for theoretical physics china Chinese Academy of Sciences Beijing China Key laboratory of Frontiers in theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing China Interdisciplinary center for theoretical Study University of Science and Technology of China Hefei China Department of physics College of Sciences Northeastern University Shenyang China

We compare some popular dark energy models under the assumption of a flat universe by using the latest observational data including the type Ia supernovae Constitution compilation,the baryon acoustic oscillation measurement from the Sloan Digital Sky Survey,the cosmic microwave background measurement given by the seven-year Wilkinson Microwave Anisotropy Probe observations and the determination of H0 from the Hubble Space *** comparison statistics such as the Bayesian and Akaike information criteria are applied to assess the worth of the *** statistics favor models that give a good fit with fewer *** on this analysis,we find that the simplest cosmological constant model that has only one free parameter is still preferred by the current *** other dynamical dark energy models,we find that some of them,such as the αdark energy,constant w,generalized Chaplygin gas,Chevalliear-Polarski-Linder parametrization,and holographic dark energy models,can provide good fits to the current data,and three of them,namely,the Ricci dark energy,agegraphic dark energy,and Dvali-Gabadadze-Porrati models,are clearly disfavored by the data.

关键词： dark energy models observational constraints model comparison information criteria

Antikaon condensation and in-medium （anti）kaon production in β equilibrium nuclear matter

在线全文

学校读者我要写书评

暂无评论

Antikaon condensation and in-medium （anti）kaon production ...

CCAST“兰州CSR上的介子物理”研讨会

作者： Guo Hua and Liu Bo Department of Technical physics and MOE laboratory of heavy ion physics, Peking University, Beijing 100871, People''s Republic of china center of theoretical nuclear physics,national laboratory of heavy ion accelerator, lanzhou 730000, People''s Republic of china Institute of High Energy physics, Beijing 100039, People''s Republic of china

＜正＞ The density dependent reiativistic mean field （DDRMF）raodel in the new parameterization used recently is extended to investigate antikaon condensation and in-medium （anti）kaon production in βequilibrium auclear matter, the obtained results show that the mean critical density for antikaon condensation is approximately 2.3po for the two model parameter sets. The subthreshold energies for （anti）kaon production are calculated, and indicate that the in-medium effects are essential for explaining the antikaon enhanced production while kaon production rates are possibly enhanced only in the high density region. As an application for βequilibrium nuclear matter, the masses against the central densities of neutron stars are studied in the DDRMF model, too.

关键词： density dependent relativistic mean field model antikaon condensation subthreshoid energies for (anti)kaon production β equilibrium nuclear matter

Predictions of synthesizing element 119 and 120

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2011年第S1期54卷 61-66页

作者： GAN ZaiGuo1, ZHOU XiaoHong1, HUANG MingHui1, FENG ZhaoQing1 & LI JunQing1,2 1Institute of Modern physics, Chinese Academy of Sciences, lanzhou 730000, china 2School of nuclear Science and Technology, lanzhou University, lanzhou 730000, china Institute of Modern physics Chinese Academy of Sciences Lanzhou China School of nuclear Science and Technology Lanzhou University Lanzhou China

The evaporation residue cross sections of synthesizing superheavy nuclei Z=119, 120 are calculated by different sets of master equations with different dynamical variables. Two methods basically predicted similar results that the Ca induced hot fusion can 48 produce element 119 easier than produce 120, and the evaporation residue cross sections for 119 are detectable by current advanced techniques, while the evaporation residue cross sections are below 0.1 pb for producing element 120.

关键词： super heavy nuclei evaporation residue cross section master equations

Investigation into the rotational bands of ^(185)Pt with the particle-rotor model

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2011年第S1期54卷 114-118页

作者： LI GuangShun1,2, ZHOU XiaoHong1,2, ZHANG ShuangQuan3, ZHANG YuHu1 & MENG Jie3 1 Institute of Modern physics, Chinese Academy of Sciences, lanzhou 730000, china 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, china 3 School of physics and SK laboratory of nuclear physics & Technology, Peking University, Beijing 100871, china Institute of Modern physics Chinese Academy of Sciences Lanzhou China Graduate University of Chinese Academy of Sciences Beijing China School of physics and SK laboratory of nuclear physics & Technology Peking University Beijing China

theoretical calculations have been performed for the ν9/2+[624](i13/2) and ν7/2-[503](f7/2) bands of 185Pt in the framework of particle-rotor model. The band properties of signature splitting and configuration mixing have been analyzed. The level energy and signature splitting before the band crossing can be well interpreted by introducing triaxiality. The positive-parity yrast band is pro posed to be dominated by the ν9/2+[624](i13/2) component, while the negative-parity band shows strong mixing of ν7/2-[503](f7/2) and ν9/2-[505](h9/2) configurations.

关键词： High-spin states particle-rotor model signature splitting configuration mixing

Resonant Continuum in the Relativistic Mean Field Theory

在线全文

学校读者我要写书评

暂无评论

Resonant Continuum in the Relativistic Mean Field Theory

CCAST“不稳定核反应”研讨会

作者： Li-gang Cao, Zhong-yu Ma china Institute of Atomic Energy, Beijing 102413, china center of nuclear theoretical physics, national laboratory of heavy ion accelerator, lanzhou 730000, china Institute of theoretical physics, Academia Sinica. Beijing 100080, china (22 November 2001)

＜正＞ Energies,widths and wave functions of the single particle resonant contin—uum are determined by solving scattering states of the Dirac equation withproper asymptotic conditions for the continuous spectrum in t...

关键词：