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Spontaneous decay of heavy and superheavy nuclei

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Spontaneous decay of heavy and superheavy nuclei

2005年全国核反应会议

作者： Zhongzhou Ren , Chang Xu Department of physics, Nanjing University, Nanjing 210008, china Center of theoretical nuclear physics, national laboratory of heavy-ion accelerator,lanzhou 73.000, china

heavy and superheavy nuclei with Z≥83 are unstable for some decay modes such as α, β, and/or spontaneous fission. These decay modes determine the half-lives of heavy and superheavy nuclei. In this

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Coexistence of normal, super-, and hyper-deformation in nuclei: A study with angular momentum projection method

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Chinese Science Bulletin 2009年第3期54卷 358-363页

作者： SUN Yang1,2, ZHANG JingYe3, LONG GuiLu4,5 & WU ChengLi6,7 1 Department of physics, Shanghai Jiao Tong University, Shanghai 200240, china 2 Joint Institute for nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA 3 Department of physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA 4 Department of physics, Tsinghua University, Beijing 100084, china 5 Center of nuclear Theory, lanzhou national laboratory of heavy ion accelerator, lanzhou 73.000, china 6 Department of physics, Xiamen University, Xiamen 361005, china 7 Department of physics, Chung Yuan Christian University, Chung-Li, Taiwan 32023, china Department of physics Shanghai Jiao Tong University Shanghai 200240 China Joint Institute for nuclear Astrophysics University of Notre Dame Notre Dame Indiana 46556 USA Department of physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Department of physics Tsinghua University Beijing 100084 China Center of nuclear Theory Lanzhou National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Department of physics Xiamen University Xiamen 361005 China Department of physics Chung Yuan Christian University Chung-Li Taiwan 32023 China

Angular-momentum-projected energy surface calculations for A ≈ 110 nuclei indicate three distinct energy minima occurring at different angular-momenta. These correspond to normal, super-, and hy- per-deformed shapes coexisting in one nucleus. 110Pd is studied in detail, with a quantitative prediction on super- and hyper-deformed spectra by the Projected Shell Model calculation. It is found that several other neighboring nuclei in the A-110 mass region, with the neutron number around 64, also exhibit clear super- and hyper-deformation minima in the projected calculation.

关键词：原子核光谱角动量能量

Dilepton as a signature for baryon-rich quark-gluon matter

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nuclear Science and Techniques 1998年第4期9卷 209-212页

作者： He Ze-Junl Zhang Jia-Ju Liu Bo (Center of theoretical nuclear physics, national laboratory of heavy ion accelerator,Lanshou 73.000 Shanghai institute of nuclear Rescarch, the Chinese Academy of Sciences, Shanghai 201800 Institate of High Enerpy physics, Centeroftheoreticalnuclearphysics NationalLaboratoryofHeavyIonAcceleratorLanzhou730000 ShanghaiInst

Considered the Drell-Yan background in the intermediate invariant mass region,the dilepton production in an expanding hot baryon-rich quark-gluon matter fire-cylinder hasbeen studied based on a previously established rclativistic hydrodynamic model. It is foundthat with increasing the rapidity the dilepton yield is strongly suppressed. Such a characteristic, signaling the formation of the baryon-rich quark-gluon matter, can be tested in futureexperiments at Brookhaven and CERN.

关键词：重离子夸克-胶子物质轻子产生

Review on theoretical studies of superheavy nuclei

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Review on theoretical studies of superheavy nuclei

International Conference on nuclear Structure physics

作者： Zhongzhou Ren and Chang Xu Department of physics Nanjing University Nanjing 210008 china Center of theoretical nuclear physics national laboratory of heavy-ion accelerator lanzhou 73.000 china

＜正＞Research on superheavy nuclei is one of the hot points in nuclear physics [1-4]. We review the current theoretical studies on superheavy nuclei. The structure and decay of heavy and superheavy nuclei are systematically studied by different models [5-13]. New models of α-decay half-lives and new formulae for nuclear binding energies and spontaneous fission half-lives are presented [7-10]. The theoretical results are in good agreement with available data of heavy and superheavy nuclei. The properties of unknown superheavy nuclei are predicted.

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Simple Formula of β^+-Decay Half-Lives of Nuclei Far From β-Stable Line

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Communications in theoretical physics 2007年第12期48卷 1072-1080页

作者： ZHANG Xiao-Ping~1 REN Zhong-Zhou~(1,2)and ZHI Qi-Jun~1~1 Department of physics,Nanjing University,Nanjing 210008,china~2 Center of theoretical nuclear physics,national laboratory of heavy-ion accelerator,lanzhou 73.000,china Department of physics Nanjing University Center of theoretical nuclear physics National Laboratory of Heavy-Ion Accelerator

We generalize the formula of β^+-decay half-lives [***.C 78 (2006) 014305] to include all availabledata of nuclei far from the β-stable line. Good agreement with experimental data is obtained by taking into accountthe even-odd (e-o) *** is shown that the e-o effect on β^+-deeay half-life is apparent for the allowed β^+-transition,whereas it is not apparent for the first and second forbidden *** demonstrates that the allowed β^+-transitionis more sensitive to the nuclear even-odd effect than the forbidden β^+-*** underlying physics is *** formula can be used to predict the β^+-decay half-lives of the nuclei far from β-*** is useful to experimentalphysicists for analyzing the data of β^+-decay.

关键词： β^+-decay half-lives formula even-odd effect

Re-study of Nucleon Pole Contribution in J/ψ→N(?)π Decay

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Communications in theoretical physics 2006年第9期46卷 507-513页

作者： ZONG Yuan-Yuan,~(1,2) SHEN Peng-Nian,~(1,3,4) ZOU Bing-Song,~(1,3,4) LIU Ji-Feng,~2 LIANG Wei-Hong~2 1 Institute of High Energy physics, the Chinese Academy of Sciences, P.O. Box 918(4), Beijing 100049, china 2 Department of physics, Guangxi Normal University, Guilin 541004, china 3 Center of theoretical nuclear physics, national laboratory of heavy ion accelerator, lanzhou 73.000, china 4 Institute of theoretical physics, the Chinese Academy of Sciences, Beijing 100080, china Institute of High Energy physics the Chinese Academy of Sciences P.O. Box 9184 Beijing 100049 Department of physics Guangxi Normal University Guilin 541004

We re-study nucleon pole contribution in J/ψ→NNπ decays by including the imaginary part for the propagator of the off-shell nucleon with energy above πN threshold. It is found that when including the imaginary part in the propagator, the branching ratio of the decay width will descend about 11% compared with the result without including the imaginary part, no matter whether including the off-shell form factors or not. It also leads to a phase of up to 25° for the off-shell nucleon propagator at invariant mass around 1400 MeV. This effect needs to be considered for detailed partial wave analysis of N* resonances around this mass region.

关键词： J/ψ decay form factor

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

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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

Nucleus-nucleus scattering based on a modified Glauber theory

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Nucleus-nucleus scattering based on a modified Glauber theor...

CCAST“不稳定核反应”研讨会

作者： Zhao Yaolin, Ma Zhongyu, Chen Baoqiu china Institute of Atomic Energy, Beijing 102413 Center of theoretical nuclear physics,national laboratory of heavy ion accelerator, lanzhou 73.000 Institute of theoretical physics, Beijing 100080

＜正＞ A modified microscopic Glauber theory has been extended to investigate thereaction and elastic differential cross sections of various projectile-target col-lisions at low and intermediate *** a systematic *** f...

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Temporal variation of some fundamental constants in the narrow nuclear transition

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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 73.000,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