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Research onα-decay for the superheavy nuclei with Z=118-120

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Chinese Physics C 2022年第5期46卷 116-128页

作者： Chen He Zhong-Ming Niu Xiao-Jun Bao Jian-You Guo School of Physics and Optoelectronics Engineering Anhui UniversityHefei 230601China Department of Physics Hunan Normal UniversityChangsha 410081China

The generalized liquid-drop model(GLDM)with the microscopic shell correction from relativistic Hartree-Fock(RHF)calculations is used to explore theα-decay of superheavy *** known nuclei with Z=106−118 are chosen as examples for *** calculated half-lives ofα-decay agree with the experimental data better than those from the GLDM with the shell correction in the Weizsa¨cker-Skyrme ***,the influence of the decay energy Q_(α) onα-decay is *** is determined that the Q_(α) values obtained from the WS4 model with radial basis function(RBF)correction match the experimental data *** to these advantages,the GLDM with the RHF shell correction and WS4+RBF Q_(α) values is adopted to predict theα-decay lifetime for the unknown superheavy nuclei with Z=118−*** trend of the availableα-decay half-lives according to the neutron number is similar to the trends of the values from the GLDM calculation without shell correction as well as the universal decay law(UDL)***,the RHF shell correction depresses(raises)theα-decay lifetime for most nuclei with N186).In comparison with the half-lives of spontaneous fission,it can be concluded that theα-decay is dominant in the superheavy nuclei ^(281−304)118,^(284−306)119,and ^(287−308)*** results are beneficial to the exploration of superheavy nuclei in experiments.

关键词： generalized liquid-drop model α-decay superheavy nuclei relativistic Hartree-Fock WS4 model

Determination of isospin asymmetry effects on α-decay

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Chinese Physics C 2019年第12期43卷 100-106页

作者： B.A.Gheshlagh O.N.Ghodsi Department of Physics Faculty of Science University of Mazandaran

In this study,we compared the effect of the isospin asymmetry of proton and neutron density distributions in the neutron skin-type(NST)case and in the Hartree-Fock formalism(HF)on the half-life of alpha emitters with the atomic number in the range of 82≤Z≤*** NST case and HF formalism based on the Skyrme-SLy4 effective interaction reveal different isospin asymmetries for selected alpha ***,the obtained results reveal an increase in theα-decay widths of about 30%for the NST case in comparison with the equivalent values obtained by HF *** standard deviations for calculated half-lives within the NST case and HF formalism are about 0.438 and 0.391,respectively.

关键词： α-decay half-life preformation factor isospin asymmetry neutron skin thickness

Calculations of theα-decay properties of Z=120,122,124,126 isotopes

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Chinese Physics C 2020年第10期44卷 98-114页

作者： Zhishuai Ge Gen Zhang Shihui Cheng Yu.S.Tsyganov Feng-Shou Zhang Key Laboratory of Beam Technology of Ministry of Education Beijing Radiation CenterBeijing 100875China Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Flerov Laboratory of Nuclear Reactions Joint Institute for Nuclear ResearchRU-141980 DubnaRussian Federation Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

Theα-decay properties of even-Z nuclei with Z=120,122,124,126 are *** employ the generalized liquid drop model(GLDM),Royer's formula,and universal decay law(UDL)to calculate theα-decay *** comparing the theoretical calculations with the experimental data of known nuclei from Fl to Og,we confirm that all the employed methods can reproduce theα-decay half-lives *** preformation factor Pαandα-decay energy Qαshow that ^298,304,314,316,324,326,338,348120,^304,306,318,324,328,338122,and ^328,332,340,344124 might be ***α-decay half-lives show a peak at Z=120,N=184,and the peak vanishes when Z=122,124,*** on detailed analysis of the competition betweenα-decay and spontaneous fission,we predict that nuclei nearby N=184 undergoα-*** decay modes of ^287−339120,^294−339122,^300−339124,and ^306−339126 are also presented.

关键词： α-decay spontaneous fission lifetime

Global α-decay study based on the mass table of the relativistic continuum Hartree-Bogoliubov theory

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Chinese Physics C 2016年第5期40卷 34-40页

作者：张林峰夏学伟 State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Yuanpei College Peking University School of Physics and Nuclear Energy Engineering and International Research Center for Nuclei and Particles in the Cosmos Beihang University

The α-decay energies （Qα） are systematically investigated with the nuclear masses for 10 ≤Z ≤120 isotopes obtained by the relativistic continuum Hartree-Bogoliubov （RCHB） theory with the covariant density func- tional PC-PK1, and compared with available experimental values. It is found that the α-decay energies deduced from the RCHB results present a similar pattern to those from available experiments. Owing to the large predicted Qα values （≥4 MeV）, many undiscovered heavy nuclei in the proton-rich side and super-heavy nuclei may have large possibilities for α-decay. The influence of nuclear shell structure on α-decay energies is also analysed.

关键词： α-decay RCHB theory mass table shell structure

α-decay Branching Ratios to Rotational Band of Heavy Even-even and Odd-A Nuclei

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原子核物理评论 2009年第S1期26卷 55-58页

作者： REN Zhong-zhou1,2,3,XU Chang2,3 (1 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Research Facility in Lanzhou,Lanzhou 730000,China 2 Department of Physics,Nanjing University,Nanjing 210008,China 3 Joint Center for Particle,Nuclear Physics and Cosmology,Nanjing 210008,China) Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China Department of Physics Nanjing UniversityNanjing 210008China Joint Center for Particle Nuclear Physics and CosmologyNanjing 210008China Department of Physics Nanjing UniversityNanjing 210008China Joint Center for Particle Nuclear Physics and CosmologyNanjing 210008China

By using a simple barrier penetration approach,we predict the α-decay branching ratios to members of ground-state rotational band of heavy even-even No isotopes. We also extend our approach to calculate the α-decay branching ratios to the rotational band of heavy odd-A nuclei. The theoretical branching ratios of α-decays are found in good agreement with the available experimental data.

关键词： α-decay branching ratio heavy nuclei

INFRARED SPECTRA EFFECT OF α-decay DAMAGE IN ZIRCON STRUCTURE

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Chinese Science Bulletin 1990年第23期35卷 1988-1991页

作者：杨学明张培善詹旺龙 Institute of Geology Academia Sinica Bering 100029 PRC

The damage in zircon structure is caused by α-decay which is associated with radiation of uranium and thorium in zircon. Over the narrow dose range from 0.3×1016 to 0.8×1016 α-events mg-1, natural crystalline zircon begins to convert to metamict state. When α-decay dose reaches 0.8×1016 α-events mg-1, the crystalline zircon would be changed to completely metamict state through several million geological years, and the metamict state zircon ap-

关键词： α-decay dose damage in structure metamict state zircon granite infrared spectra.

Systematic study of α decay half-lives for even–even nuclei within a deformed two-potential approach

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Communications in Theoretical Physics 2022年第5期74卷 86-96页

作者： Hai-Feng Gui Hong-Ming Liu Xi-Jun Wu Peng-Cheng Chu Biao He Xiao-Hua Li School of Nuclear Science and Technology University of South China421001 HengyangChina School of Math and Physics University of South China421001 HengyangChina The Research Center for Theoretical Physics Science SchoolQingdao University of TechnologyQingdao 266033China College of Physics and Electronics Central South UniversityChangsha 410083 China National Exemplary Base for International Sci&Tech.Collaboration of Nuclear Energy and Nuclear Safety University of South ChinaHengyang 421001 China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South China421001 Hengyang.China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal University

In this work,we systematically study theαdecay half-lives of 196 even–even nuclei using a two-potential approach improved by considering nuclear *** results show that the accuracy of this model has been improved after considering nuclear *** addition,we extend this model to predict theαdecay half-lives of Z=118 and 120 isotopes by inputting theαdecay energies extracted from the Weizsacker–Skyrme-type(WS-type)mass model,a simple nuclear mass formula,relativistic continuum Hartree–Bogoliubov theory and Duflo-Zuker-19(DZ19)mass *** is useful for identifying the new superheavy elements or isotopes for future ***,the predictedαdecay energies and half-lives of Z=118 and 120isotopes are analyzed,and the shell structure of superheavy nuclei is *** shows that the shell effect is obvious at N=184,while the shell effect at N=178 depends on the nuclear mass model.

关键词： α-decay deformed two-potential approach superheavy nuclei magic number

Constraints on neutron skin thickness and symmetry energy of 208Pb through Skyrme forces and cluster model

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Chinese Physics C 2020年第5期44卷 92-99页

作者： M.Moghaddari Amiri O.N.Ghodsi Department of Physics Faculty of ScienceUniversity of MazandaranP.O.Box 47415-416BabolsarIran

We used the cluster structure properties of the 212Po to estimate the neutron skin thickness of *** this purpose,we considered two important components:(a)alpha decay is a low energy phenomenon;therefore,one can expect that the mean-field,which can explain the ground state properties of 212Po,does not change during the alpha decay process.(b)212Po has a high alpha cluster-like structure,two protons and two neutrons outside its core nucleus with a double magic closed-shell,and the cluster model is a powerful formalism for the estimation of alpha decay preformation factor of such *** slope of the symmetry energy of 208Pb is estimated to be 75±25 MeV within the selected same mean-fields and Skyrme forces,which can simultaneously satisfy the ground-state properties of parent and daughter nuclei,as their neutron skin thicknesses are consistent with experimental data.

关键词： α-decay isospin asymmetry neutron-skin thickness Hartree-Fock formalism

Evaluation of Natural Radioactivity Levels for Structural Material Used in the Construction of the Neutrino Detector

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World Journal of Nuclear Science and Technology 2015年第1期5卷 43-56页

作者： Vladimir G. Zinovyev Anatolii P. Serebrov Ivan A. Mitropolsky Yuriy E. Loginov Georgiy I. Shulyak Tatyana M. Tyukavina Sergey L. Sakharov Anatoly V. Chernyj Neutron Research Department National Research Centre “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics Institute Gatchina Russia

In this work, the evaluation of natural radioactivity and spontaneous fission rates was performed for 8 nuclides from the natural radioactive 238U, 235U and 232Th decay chains. For this purpose, three samples of structural materials of the neutrino detector, i.e. aluminum, titanium and glass were analyzed by gamma spectroscopy and by neutron activation analysis to quantify a specific radioactivity of the samples. According to the results of this investigation, glass and aluminum samples have maximum values of the mean uranium concentrations 7.3(7) × 10-4% and 3.1(6) × 10-5%, respectively, while the lowest value for mean concentration of the uranium was found in titanium samples to be 4.7(3) × 10-6%. Aluminum sample had maximum values of the mean thorium concentrations, 2.5(8) × 10-3%, while the lowest value for mean concentration of the thorium was found in titanium samples to be 6.2(3) × 10-7%.

关键词： Spontaneous Fission Radioactive decay Chain α-decay Radionuclide Branching Factor