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A study of U-isotope ground state properties with covariant energy density functional

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Chinese Physics C 2024年第6期 134-139页

作者：王俊辰田源续瑞瑞崔莹陶曦孙小东张智张玥韩银录葛智刚舒能川 china Nuclear Data Center China Institute of Atomic Energy China Institute of Atomic Energy

In this study, we systematically analyzed the ground state of uranium isotopes from 225 to 240. In our calculations, we used the covariant energy density functional of density-dependent meson exchange interaction(DDME2) with separable pairing interaction(TMR). Using the multiple deformation constraint, we calculated the potential energy surface(PES) of the uranium isotopes for both even-even and even-odd nuclei with quadrupole and octupole deformation. Based on our calculation and upon comparing the experimental data and Hartree-Fock-Bogoliubov calculations with Gogny D1S calculation data, the ground state of uranium isotopes with reflection-asymmetric deformation was found to be preferred.

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Studies on the separation treatment of high-level liquid waste by bisamide podand(Ⅰ):Extraction and separation of An(Ⅲ)from Ln(Ⅲ)

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Chinese Chemical Letters 2022年第7期33卷 3439-3443页

作者： Li-Kun Liu Shu-Bao Xie Hong-Bin Lv Hu Zhang Guo-An Ye China Institute of Atomic Energy Beijing 102413China

A process for actinide(Ⅲ)and lanthanum(Ⅲ)extraction separation from high-level liquid waste(HLLW)was proposed,with N,N,N’,N’-tetraoctyl diglycolamide(TODGA)as the extractant,tri-n–butyl phosphate(TBP)as the phase modifier and 2,6-bis[1-(propan-1-ol)-1,2,3-triazol-4-yl]pyridine(PyTri-Diol or PTD)as hydrophilic stripping agent.This‘hot test’was successfully carried out,achieving 99.92%removal of americium-241(^(241)Am)with a separation factor SF(Eu/Am)of 3.8×10^(3)in the actinide(Ⅲ)product solution.The results show that bisamide podand extractants can effectively realize the extraction and separation of actinide(Ⅲ)and lanthanum(Ⅲ)from Chinese commercial HLLW and thus have a bright practical application potential for the treatment of commercial HLLW.

关键词： Bisamide podand High-level liquid waste Actinides Lanthanides Extraction separation

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质子滴线核在近库仑势垒能区的反应动力学

Science Bulletin 2023年第8期68卷 775-778页

作者：杨磊林承键马南茹温培威贾会明 Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China

The nuclear drip line corresponds to zero binding for protons and neutrons,defining the boundary of nuclide landscape.Beyond the drip lines,nuclei become unbound,in respect to nucleon emission.Nuclei located closest to the drip line,which are commonly referred to as drip line nuclei,may exhibit phenomena untypical for tightly bound nuclei in the valley of stability.

关键词： stability. 反应动力学 boundary

Preliminary design of an SCO_(2) conversion system applied to the sodium cooled fast reactor

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Frontiers in energy 2021年第4期15卷 832-841页

作者： Hongyi YANG Xiaoyan YANG Jun YANG Quanbin ZHAO Xiaokun WANG Daotong CHONG Chanjuan TANG Chengyuan JIANG China Institute of Atomic Energy Beijing 102413China

The supercritical carbon dioxide(SCO_(2))Brayton cycle has become an ideal power conversion system for sodium-cooled fast reactors(SFR)due to its high efficiency,compactness,and avoidance of sodiumwater reaction.In this paper,the 1200 MWe large pool SFR(CFR1200)is used as the heat source of the system,and the sodium circuit temperature and the heat load are the operating boundaries of the cycle system.The performance of different SCO_(2) Brayton cycle systems and changes in key equipment performance are compared.The study indicates that the inter-stage cooling and recompression cycle has the best match with the heat source characteristics of the SFR,and the cycle efficiency is the highest(40.7%).Then,based on the developed system transient analysis program(FR-Sdaso),a pool-type SFR power plant system analysis model based on the inter-stage cooling and recompression cycle is established.In addition,the matching between the inter-stage cooling recompression cycle and the SFR during the load cycle of the power plant is studied.The analysis shows that when the nuclear island adopts the flow-advanced operation strategy and the carbon dioxide flowrate in the SCO_(2) power conversion system is adjusted with the goal of maintaining the sodium-carbon dioxide heat exchanger sodium side outlet temperature unchanged,the inter-stage cooling recompression cycle can match the operation of the SFR very well.

关键词： sodium-cooled fast reactor(SFR) supercritical carbon dioxide(SCO_(2)) brayton cycle load cycle

Theoretical uncertainties on the extraction of in-medium NN cross sections by different Pauli blocking algorithms

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Chinese Physics C 2021年第7期45卷 254-262页

作者：陈响张英逊李祝霞 China Institute of Atomic Energy Beijing 102413China

Three typical Pauli blocking algorithms in quantum molecular dynamics type models are investigated in the nuclear matter,the nucleus,and heavy ion collisions.In nuclear matter,the blocking ratios obtained with the three algorithms are underestimated by 13%-25%compared to the corresponding analytical values.For a finite nucleus,spurious collisions occur around the surface of the nucleus owing to the defects of the Pauli blocking algorithms.In the simulations of heavy ion collisions,the uncertainty of stopping power arising from the different Pauli blocking algorithms is less than 5%.Furthermore,the in-medium effects of nucleon-nucleon(NN)cross sections on the nuclear stopping power are discussed.Our results show that the transport model calculations with free NN cross sections result in the stopping power decreasing with beam energy when the beam energy is less than 300 MeV/u.To increase or decrease the values of the stopping power,the transport model calculations need enhanced or suppressed model dependent in-medium NN cross sections that are expected to be smaller than the true in-medium NN cross sections.

关键词： Pauli blocking in-medium AW cross sections quantum molecular dynamics model stopping power

Astrophysical 22Mg(p,γ)23Al reaction rates from asymptotic normalization coefficient of 23Ne→22Ne+n

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Chinese Physics C 2020年第7期44卷 80-86页

作者：李鑫悦郭冰李志宏柳卫平 China Institute of Atomic Energy Beijing 102413China

The radionuclide 22Na generates the emission of a characteristic 1.275 MeVγ-ray.This is a potential astronomical observable,whose occurrence is suspected in classical novae.The 22Mg(p,γ)23Al reaction is relevant to the nucleosynthesis of 22Na in Ne-rich novae.In this study,employing the adiabatic distorted wave approximation and continuum discretized coupled channel methods,the squared neutron asymptotic normalization coefficients(ANCs)231 for the virtual decay of Ne→22Ne+n were extracted,and determined as(0.483±0.060)fm-1 and(9.7±2.3)fm-1 for the ground state and the first excited state from the experimental angular distributions of 22Ne(d,p)23Ne populating the ground state and the first excited state of 23Ne,respectively.Then,the squared proton ANC of 23Alg.***.was obtained as Cd5/22(23Al)(2.65±0.33)×103 fm-1 according to the charge symmetry of the strong interaction.The astrophysical S-factors and reaction rates for the direct capture contribution in 22Mg(p,γ)23Al were also presented.Furthermore,the proton width of the first excited state of 23Al was derived to be(57±14)eV from the neutron ANC of its mirror state in 23Ne and used to compute the contribution from the first resonance of 23Al.This result demonstrates that the direct capture dominates the 22Mg(p,γ)23Al reaction at most temperatures of astrophysical relevance for 0.33

关键词： classical nova transfer reaction asymptotic normalization coefficient radiative capture

Effect of Foil Target Thickness in Proton Acceleration Driven by an Ultra-Short Laser

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Plasma Science and Technology 2015年第6期17卷 458-460页

作者：路建新兰小飞席晓峰张海峰张骥王雷剑汤秀章王乃彦 China Institute of Atomic Energy

Proton acceleration experiments were carried out by a 1.2× 1018 W/cm2 ultra-short laser interaction with solid foil targets. The peak proton energy observed from an optimum target thickness of 7 μm in our experiments was 2.1 MeV. Peak proton energy and proton yield were investigated for different foil target thicknesses. It was shown that proton energy and conversion efficiency increased as the target became thinner, on one condition that the preplasma generated by the laser prepulse did not have enough shock energy and time to influence or destroy the target rear-surface. The existence of optimum foil thickness is due to the effect of the prepulse and hot electron transportation behavior on the foil target.

关键词： ultra-short laser proton thin foil target target normal sheath acceleration

Experimental research of heavy ion and proton induced single event effects for a Bi-CMOS technology DC/DC converter

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Journal of Semiconductors 2015年第11期36卷 114-118页

作者：何安林郭刚史淑廷沈东军刘建成蔡莉范辉 China Institute of Atomic Energy

This paper tested and analyzed heavy ion and proton induced single event effects（SEE） of a commercial DC/DC converter based on a 600 nm Bi-CMOS technology. Heavy ion induced single event transients（SET） testing has been carried out by using the Beijing HI-13 tandem accelerator at China Institute of Atomic Energy. Proton test has been carried out by using the Canadian TRIUMF proton accelerator. Both SET cross section versus linear energy transfer（LET） and proton energy has been measured. The main study conclusions are：（1） the DC/DC is both sensitive to heavy ion and proton radiations although at a pretty large feature size（600 nm）, and threshold LET is about 0.06 Me V mg/cm^2;（2） heavy ion SET saturation cross section is about 5 magnitudes order larger than proton SET saturation cross section, which is consistent with the theory calculation result deduced by the RPP model and the proton nuclear reaction model;（3） on-orbit soft error rate（SER） prediction showed, on GEO orbit,proton induced SERs calculated by the heavy ion derived model are 4–5 times larger than those calculated by proton test data.

关键词： heavy ion proton DC/DC converter single event effects

Neutron activation cross section data library

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Chinese Physics B 2022年第6期31卷 82-86页

作者：黄小龙葛智刚金永利吴海成陶曦王记民刘丽乐张玥吴小飞 china Nuclear Data Center China Institute of Atomic EnergyBeijing 102413China

To satisfy the requirements of nuclear reaction cross sections in nuclear engineering applications and nuclear physics studies,the Neutron Activation Cross Section Data Library has been established.818 target nuclei including unstable target or isomeric target nuclei are considered in this library.The induced neutron energy range region is between 10^(-5)eV and 20 MeV.The standard ENDF-6 format is adopted,including general information,reaction cross sections,multiplicities,and so on.The recommended reaction cross sections were obtained using UNF code system and FDRR nuclear model codes or systematic analysis based on available experimental data.

关键词： neutron reaction cross section unified Hauser-Feshbach and exciton model(UNF) evaluation activation data library