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Systematic study of cluster radioactivity within the generalized liquid drop model

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Chinese Physics C 2024年第6期48卷 118-129页

作者：邓军刚程俊皓包小军张鸿飞 College of Science China Three Gorges UniversityYichang 443002China Center for Astronomy and Space Sciences China Three Gorges UniversityYichang 443002China Department of Physics National University of Defense TechnologyChangsha 410073China Department of Physics Collaborative Innovation Center for Quantum Effectsand Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of EducationHunan Normal UniversityChangsha 410081China School of Physics Xi'an Jiaotong UniversityXi'an 710049China

Cluster radioactivity is studied within the generalized liquid drop model(GLDM),in which the shell correction energy,pairing energy,and cluster preformation factor are *** calculations show significant improvements and can reproduce the experimental data within a factor of 8.04 after considering these physical *** addition,the systematic trend of the cluster preformation factors is discussed in terms of the N_(p)N_(n)scheme to study the influence of the valence proton-neutron interaction and shell effect on cluster *** is found that log10Pcis linearly related to N_(p)N_(n).This is in agreement with a recent study[*** et al.,***.C 108,014325(2023)],in which log10Pc,obtained using different theoretical models and treatment methods than those used in this study,also had a linear relationship with N_(p)N_(n).Combined with the work by Qi et al.,this study suggests that the linear relationship between log10Pcand N_(p)N_(n)is model-independent and both the shell effect and valence proton-neutron interaction play essential roles in cluster *** analytical formula is proposed to calculate the cluster preformation factor based on the N_(p)N_(n)*** addition,the cluster preformation factors and the cluster radioactivity half-lives of some heavy nuclei are predicted,which can provide a reference for future experiments.

关键词： cluster radioactivity cluster preformation factor shell effect generalized liquid drop model

Possibilities for synthesis of new neutron-deficient isotopes of superheavy nuclei

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Chinese Physics C 2019年第5期43卷 70-80页

作者： xiao-jun bao Department of Physics Collaborative Innovation Center for Quantum Effects and Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education Hunan Normal University

This study investigates the optimal projectile/target combination for the production of new neutron-deficient isotopes of superheavy nuclei(SHN). To this end, the dependence of the evaporation residue cross-section(ERCS) used to synthesize SHN on the mass asymmetry and the isospin of colliding nuclei are analyzed within the dinuclear system(DNS) concept. The predicted ERCSs for the production of new neutron-deficient isotopes of SHN were found to be quite large with the ^(36) S projectile, and the cross-section of SHN decreases slowly with the charge of compound nuclei owing to the increase in their survival probability,. Wsur is not canceled by the decreasing probability, PCN, that the system will evolve from a touching configuration to the compound nucleus in competition with the quasifission process.

关键词： new neutron deficient isotopes superheavy nuclei optimal projectile-target combination isospin effects

Analysis of survival probability based on superasymmetric reaction systems

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Chinese Physics C 2020年第9期44卷 95-102页

作者： Na-Na Li xiao-jun bao Department of Physics Collaborative Innovation Center for Quantum Effectsand Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of EducationHunan Normal UniversityChangsha 410081China

The survival probability of an excited compound nucleus was studied using two different approaches of the washing out of shell effects with excitation energy based on a superasymmetric reaction *** estimated evaporation residue cross sections based on the two different methods are compared with the available experimental *** methods are in agreement with the experimental data to a certain extent for some specific reactions and emission channels.

关键词： survival probability superasymmetric reaction systems two different approaches shell effect washing out with excitation energy

A novel way to synthesize Pb nanotapes in liquid ammonia

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Chinese Chemical Letters 2011年第8期22卷 993-996页

作者： Lei Sun Meng Lei Zhang xiao jun Tao Yan bao Zhao Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng 475004 China

Lead nanotapes were synthesized in liquid ammonia solvent in the presence of sodium metal at low *** process was template *** electron microscopy（TEM） observations and X-ray diffraction（XRD） characterizations revealed that the as-prepared Pb nanotapes have average diameters in the range of 40-50 *** lengths up to several hundred nanometers, and exhibit cubic crystal structures.

关键词： Pb Nanotapes Chemical synthesis Liquid ammonia

Improved macroscopic microscopic mass formula

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Chinese Physics C 2021年第7期45卷 247-253页

作者： Tian-Liang Zhao xiao-jun bao Hong-Fei Zhang School of Nuclear Science and Technology Lanzhou University730000 LanzhouChina Department of Physics Collaborative Innovation Center for Quantum Effectsand Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of EducationHunan Normal UniversityChangsha 410081China

A nuclear mass formula based on the macroscopic microscopic approach is proposed,in which the number of model parameters is reduced compared with other macroscopic microscopic *** root mean square(RMS)deviation with respect to 2314 training sets(measured nuclear masses)is reduced to 0.447 MeV,and the calculated value of each nucleus is no more than 0.8%different from the experimental *** single and two nucleon separation energies and the shell gaps are calculated to test the *** shell corrections and double magic number of superheavy nuclei are also analyzed.

关键词： macroscopic microscopic mass formula shell gap nucleon separation energy fission barrier single-particle energy level

Diffuseness effect and radial basis function network for optimizing α decay calculations

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Chinese Physics C 2021年第2期45卷 459-466页

作者： Na-Na Ma xiao-jun bao Hong-Fei Zhang School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Department of Physics Collaborative Innovation Center for Quantum Effectsand Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of EducationHunan Normal UniversityChangsha 410081China

A radial basis function network(RBFN)approach is adopted for the first time to optimize the calculation of$\alpha$decay half-life in the generalized liquid drop model(GLDM),while concurrently incorporating the surface diffuseness *** calculations presented herein agree closely with the experimental half-lives for 68 superheavy nuclei(SHN),achieving a remarkable reduction of 40%in the root-mean-square(rms)deviations of ***,using the RBFN method,the half-lives for four SHN isotopes,252-288Rf,272-310Fl,286-316119,and 292-318120,are predicted using the improved GLDM with the diffuseness correction and the decay energies from WS4 and FRDM as ***,we conclude that the diffuseness effect should be embodied in the proximity ***,increased application of neural network methods in nuclear reaction studies is encouraged.

关键词： αdecay radial basis function network the surface diffuseness effect

Systematic study of theαdecay preformation factors of the nuclei around the Z=82,N=126 shell closures within the generalized liquid drop model

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Chinese Physics C 2020年第9期44卷 130-141页

作者： Hong-Ming Liu You-Tian Zou xiao Pan xiao-jun bao xiao-Hua Li School of Nuclear Science and Technology University of South ChinaHengyang 421001China Hunan Normal University Changsha 410081China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In this study,we systematically investigate theαdecay preformation factors,Pα,and theαdecay half-lives of 152 nuclei around Z=82,N=126 closed shells based on the generalized liquid drop model(GLDM)with Pαbeing extracted from the ratio of the calculatedαdecay half-life to the experimental *** results show that there is a remarkable linear relationship between Pαand the product of valance protons(holes)Np and valance neutrons(holes)*** the same time,we extract theαdecay preformation factor values of the even–even nuclei around the Z=82,N=126 closed shells from the study of Sun et al.[***.G:***.,45:075106(2018)],in which theαdecay was calculated by two different microscopic *** find that theαdecay preformation factors are also related to *** with our previous studies[Sun et al.,***.C,94:024338(2016);Deng et al.,ibid.96:024318(2017);Deng et al.,ibid.97:044322(2018)]and that of Seif et al.,[***.C,84:064608(2011)],we suspect that this phenomenon of linear relationship for the nuclei around the above closed shells is *** may be caused by the effect of the valence protons(holes)and valence neutrons(holes)around the shell ***,using the formula obtained by fitting theαdecay preformation factor data calculated by the GLDM,we calculate theαdecay half-lives of these *** calculated results agree with the experimental data well.

关键词： αdecay αdecay preformation factor shell closure generalized liquid drop model

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

Basic characteristics of nuclear landscape by improved Weizs?cker-Skyrmetype nuclear mass model

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Chinese Physics C 2019年第4期43卷 114-129页

作者： Na-Na Ma Hai-Fei Zhang xiao-jun bao Hong-Fei Zhang School of Nuclear Science and Technology Lanzhou University Northwest Institute of Nuclear Technology Department of Physics Collaborative Innovation Center for Quantum Effects and Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education Hunan Normal University

Atomic Mass Evaluation(AME2016) has replenished the latest nuclear binding energy data. Other physical observables, such as the separated energies, decay energies, and the pairing gaps, were evaluated based on the new mass table. An improved Weizs?cker-Skyrme-type(WS-type) nuclear mass model with only 13 parameters was presented, including the correction from two combinatorial radial basis functions(RBFs), where shell and pairing effects are simultaneously dealt with using a Strutinsky-like method. The RBFs code had 2267 updated experimental binding energies as inputs, and their correspondent root-mean square(rms) deviations dropped to 149 keV. For the training of other mass models by RBFs correction, rms deviations are clustered between 100 keV to 200 keV. Compared with other experimental quantities, the rms deviations calculated within the improved WS-type model falls between 100 keV and 250 keV. We extrapolate the binding energies to 12435 nuclei, which covers the ranges 8 ≤ Z ≤ 128 and 8 ≤ N ≤ 251 in the framework of the WS-type model with RBFs correction. Simultaneously, the ground state deformations β_(2,4,6) and all parts in the WS-type mass formula are presented in this paper. Finally, we tabulated all calculated characteristics within the improved formula and linked them to https://***/lukeronger/Nuclear Data-LZU: nuclear binding energies, one-nucleon and two-nucleon separation energies(S_(n,p,2n,2p)), and β-decay energies( Q_α and Q_(β-,β+,EC)), and the pairing gap ?_n and ?_p.

关键词： mass model radial basis functions binding energy separated energy decay energy pairing gap