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核技术（英文版）

核技术（英文版）

CSCD

Nuclear Science and Techniques
本刊是中国核学会会刊，由国内外核研究领域的著名科学家组成编委会。它刊登理论、实验和应用核物理，放射化学和辐射化学，核测量方法和仪器，核能与石材料科学、生命科学、农业、地球和环境科学方面的应用，是中国在核研究领域中唯一的一份英文期刊。发表的论文为国际六大著名检索期刊中的五个所收录。
  • 发文量：2186
  • 被引量：273
  • H指数：1
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  • 维普期刊影响因子： 0.25
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  • 国内刊号/CN：31-1559/TL
    国际刊号/ISSN：1001-8042
  • 发行周期：双月刊
    邮发代号：4-647
  • 主管单位：中国科学院
    主办单位：中国科学院上海应用物理研究所；中国核学会
核技术（英文版）-联系信息
  • 主编：Ma Yu-Gang
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  • 邮箱：nst@sinap.ac.cn
  • 地址：2019 Jialuo Road, Jiading, Shanghai
  • 邮编：201800
核技术（英文版）-获奖情况
  • • 卓越计划期刊
  • • 2015年度科学出版社"期刊出版质量优秀奖"
  • • 2016年中国国际影响力优秀学术期刊
  • • 2018年中国国际影响力优秀学术期刊
  • • 2018年上海"最具潜力英文期刊"
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核技术（英文版） >2021年第12期

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  • 摘要：The method based on solvent parameters (mass,cycle of acidification,and autodeposition time),combined with response surface methodology (RSM) modeling and optimization,has been developed for maximizing 210poactivity in tea samples,as observed by an alpha spectrometer.RSM based on 3-factor and 5-level composite center design was used to obtain the optimal combination of solvent conditions.As solvent parameters for 210po activity,different masses (0.5,0.75,1,1.5,and 2 g),different cycles of acidification (2,3,4,5,and 6 times),and different autodeposition times (2,3,4,5,and 6 h) were studied.The 3D response surface plot and the contour plot derived from the mathematical models were used to determine the optimal conditions.According to the obtained results,the experimental value of 210Po activity was in good agreement (R2=0.96) with the value predicted by the model.We found a favorable effect of mass on the 210Po activity (p＜0.05).
  • 摘要：A multichannel low-noise electronic prototype system was designed for a pixelated CdZnTe detector.This system is the result of preliminary work on a solar hard X-ray imager,which is one of the three payloads for future solar observations satellite-Advanced Space-based Solar Observatory (ASO-S).A new charge-sensitive amplifier application-specific integrated circuit,VATA450.3,with an on-chip analog-to-digital converter,is used to read out 8 × 8 anode pixel signals.Two CdZnTe detectors with a thickness of 2 mm and 5 mm were tested.The 2-mm-thick detector achieved energy resolution better than 5％ (fullwidth at half-maximum,FWHM) at 59.5 keV,and the 5-mm-thick detector had better resolution than 1.2％(FWHM) at 662 keV.The design and test results of the prototype system are discussed in this paper.
  • 摘要：In resonance with the Fukushima Daiichi Nuclear Power Plant accident lesson,a novel fuel design to enhance safety regarding severe accident scenarios has become increasingly appreciated in the nuclear power industry.This research focuses on analysis of the neutronic properties of a silicon carbide (SiC) cladding fuel assembly,which provides a greater safety margin as a type of accident-tolerant fuel for pressurized water reactors.The general physical performance of SiC cladding is explored to ascertain its neutronic performance.The neutron spectrum,accumulation of 239pu,physical characteristics,temperature reactivity coefficient,and power distribution are analyzed.Furthermore,the influences of a burnable poison rod and enrichment are explored.SiC cladding assemblies show a softer neutron spectrum and flatter power distribution than conventional Zr alloy cladding fuel assemblies.Lower enrichment fuel is required when SiC cladding is adopted.However,the positive reactivity coefficient associated with the SiC material remains to be offset.The results reveal that SiC cladding assemblies show broad agreement with the neutronic performance of conventional Zr alloy cladding fuel.In the meantime,its unique physical characteristics can lead to improved safety and economy.
  • 摘要：Distributed X-ray sources comprise a single vacuum chamber containing multiple X-ray sources that are triggered and emit X-rays at a specific time and location.This process facilitates an application for innovative system concepts in X-ray and computer tomography.This paper proposes a novel electron beam focusing,shaping,and deflection electron gun for distributed X-ray sources.The electron gun uses a dispenser cathode as an electron emitter,a mesh grid to control emission current,and two electrostatic lenses for beam shaping,focusing,and deflection.Novel focusing and deflecting electrodes were designed to increase the number of focal spots in the distributed source.Two identical half-rectangle opening electrodes are controlled by adjusting the potential of the two electrodes to control the electron beam trajectory,and then,multifocal spots are obtained on the anode target.The electron gun can increase the spatial density of the distributed X-ray sources,thereby improving the image quality.The beam experimental results show that the focal spot sizes of the deflected (deflected amplitude 10.5 mm)and non-deflected electron beams at full width at half maximum are 0.80 mm × 0.50 mm and 0.55 mm × 0.40 mm,respectively (anode voltage 160 kV;beam current 30 mA).The imaging experimental results demonstrate the excellent spatial resolution and time resolution of an imaging system built with the sources,which has an excellent imaging effect on a field-programmable gate array chip and a rotating metal disk.
  • 摘要：In this study,the activity concentrations of 226Ra,232Th,222Rn,and 40K,emanation fractions (P),equilibrium equivalent concentration (EEC),and mass exhalation rates (Em) of radon released from building materials used in Malaysia were studied using gamma-ray spectrometer with HPGe detector.Radiological parameters [activity concentration index (ACI),indoor air-absorbed dose rate (Din),annual effective dose (AEDin) from external and internal (ERn),soft tissues (HST) and lung (HL),and effective dose equivalent (Heff)] were estimated to evaluate radiological hazards due to the use of these building materials:sand,cement,gravel,bricks,tiles,fly ash,white cement,and ceramic raw materials.The measured P,EEC,and Em vary from 10 to 30％,0.9 to 22 Bq m-3,and 33 to 674 mBq h-1 kg-1,respectively,while the calculated ACI and AEDin vary from 0.1 ±0.01 to 2.1 ± 0.1 and 0.1 ± 0.01 to 2.4 ± 0.6 mSv y-1,respectively.On the other hand,the internal annual effective dose ranges from 0.1 to 1.4 mSvy-1.The estimated radiological risk parameters were below the recommended maximum values,and radiological hazards associated with building materials under investigation are therefore negligible.
  • 摘要：Existing standards show a clear discrepancy in the specification of the maximum proton energy for qualified ground-based evaluation of single-event effects,which can range from 180 to 500 MeV.This work finds that the threshold linear energy transfer of a tested device is a critical parameter for determining the maximum proton energy.The inner mechanisms are further revealed.Highenergy deposition events (＞ 10 MeV) in sensitive volumes are attributed to the interaction between protons and the tungsten vias in the metallization layers.
  • 摘要：Stochastic point kinetics equations (SPKEs) are a system of It(o) stochastic differential equations whose solution has been obtained by higher-order approximation.In this study,a fractional model of SPKEs has been analyzed.The efficiency of the proposed higher-order approximation scheme has been discussed in the results section.The solutions of SPKEs in the presence of Newtonian temperature feedback have also been provided to further discuss the physical behavior of the fractional model.
  • 摘要：The full-spectrum least-squares (FSLS) method is introduced to perform quantitative energy-dispersive X-ray fluorescence analysis for unknown solid samples.Based on the conventional least-squares principle,this spectrum evaluation method is able to obtain the background-corrected and interference-free net peaks,which is significant for quantization analyses.A variety of analytical parameters and functions to describe the features of the fluorescence spectra of pure elements are used and established,such as the mass absorption coefficient,the Gi factor,and fundamental fluorescence formulas.The FSLS iterative program was compiled in the C language.The content of each component should reach the convergence criterion at the end of the calculations.After a basic theory analysis and experimental preparation,13 national standard soil samples were detected using a spectrometer to test the feasibility of using the algorithm.The results show that the calculated contents of Ti,Fe,Ni,Cu,and Zn have the same changing tendency as the corresponding standard content in the 13 reference samples.Accuracies of 0.35％ and 14.03％ are obtained,respectively,for Fe and Ti,whose standard concentrations are 8.82％ and 0.578％,respectively.However,the calculated results of trace elements (only tens of μg/g) deviate from the standard values.This may be because of measurement accuracy and mutual effects between the elements.
  • 摘要：The yield ratios of neutron/proton (R(n/p)) and 3H/3He (R(t/3He)) with reduced rapidity from 0 to 0.5 are investigated for 50 MeV/u 42,44,46,48,50,52,54,56Ca+40Ca.This was conducted at whole reduced impact parameters using the isospin-dependent quantum-molecular-dynamics model in which the initial neutron and proton densities are sampled within the Skyrme-Hartree-Fock model,using which the neutron skin thickness (ΔRnp) is determined for different neutron-rich Ca isotopes.The results show that both R(n/p) and R(t/3He) have strong linear correlations with ΔRnp of different Ca isotopic projectiles from five different centralities.It is suggested that R(n/p) and R(t/3He),from the same centrality,could be treated as possible experimental observables to extract the neutron skin or halo thickness for neutron-rich isotopic nuclei,including the nuclei near the neutron drip line.
  • 摘要：Molten salt pebble bed reactor is one of the sixth-generation Ⅳ reactor types.To investigate the mechanical behavior of the fuel pebbles in the core,a visualization experiment facility of pebble bed (VEFPB) is designed.To obtain a uniform flow field of the core and analyze the influence of the flow field on the structure of the pebble bed,computational fluid dynamics software Fluent is used to simulate the flow field distribution of the core of VEFPB.The simulation results show that the disturbance at the bottom of the pebble bed is proportional to the flow velocity of the inlet pipe,and the flow velocity close to the inlet side is more significant than that in other parts;the design of the cylinder bottom plate with holes of different sizes can effectively reduce the flow velocity and the disturbance at the bottom of the pebble bed.In addition,according to the velocity contours of the core of VEFPB,it is observed that the flow field distribution of the core is considerably uniform except at the bottom of the pebble bed.This ensures the stability of the pebble bed and verifies the rationality of the design of VEFPB.This study provides the technical support and reference for the flow field analysis of the core of molten salt pebble bed reactor.
  • 摘要：In pursuit of a fully coherent X-ray free-electron laser (FEL),highly reflective Bragg crystals are used and will be used as a highly selective spectral filter in hard X-ray self-seeding FELs and X-ray FEL oscillators (XFELO),respectively.However,currently,when simulating self-seeding and XFELO,the three-dimensional effect of Bragg diffraction is not fully considered.In this paper,we derive a comprehensive solution for the response function of the crystal in Bragg diffraction.A three-dimensional X-ray crystal Bragg diffraction code,named BRIGHT,is introduced,which can be combined with other FEL-related codes,e.g.,GENESIS and OPC.Performance and feasibility are assessed using two numerical examples,namely a self-seeding experiment for the linac coherent light source and XFELO options for Shanghai high repetition rate XFEL.The results indicate that BRIGHT provides a new and useful tool for three-dimensional modeling of FEL.
  • 摘要：We have proposed a pocket formula for mass attenuation coefficient (μ/ρ),mass energy absorption coefficient (μen/ρ),and effective atomic number (Zeff) in different tissues of human organs.We have also assigned a new chemical formula for all studied tissues based on their composition.We have introduced a new parameter called effective composition index (Ceff).Based on this,we have introduced a new method to compute the effective atomic number.The evaluated photon interaction parameters are graphically represented.The evaluated average,maximum,minimum,and standard deviations of effective atomic number are tabulated.The proposed formula produces a mass attenuation coefficient,mass energy absorption coefficient,and effective atomic number from their composition
  • 摘要：A new nondestructive method to estimate the volume fraction and homogeneity of tristructural isotropic (TRISO)-coated fuel particles in fuel compacts designed for high-temperature reactors has been developed using image analysis of conventional X-radiographs.The method is demonstrated on surrogate fuel compacts containing TRISO-coated particles with kernels made of zirconium dioxide.The methodology incorporates a correction for superimposed images of TRISO particles such that a single X-ray image obtained in any one random orientation is sufficient to characterize the fuel compact in terms of volume fraction and homogeneity.The method is based on the virtual segregation of images of each particle inside the compact with the aid of a calibration standard.
  • 摘要：Light and heavy clusters are calculated for warm stellar matter in the framework of relativistic mean-field models, in the single-nucleus approximation. The cluster abundances are determined from the minimization of the free energy. In-medium effects of light cluster properties are included by introducing an explicit binding energy shift analytically calculated in the Thomas-Fermi approxima-tion, and the coupling constants are fixed by imposing that the virial limit at low density is recovered. The resulting light cluster abundances come out to be in reasonable agreement with constraints at higher density coming from heavy-ion collision data. Some comparisons with micro-scopic calculations are also shown.
  • 摘要：The mechanism of multinucleon transfer reac-tions has been investigated within the dinuclear system model, in which the sequential nucleon transfer is descri-bed by solving a set of microscopically derived master equations. The transfer dynamics in the reaction of 136Xe + 208Pb near Coulomb barrier energies is thoroughly ana-lyzed. It is found that the total kinetic energies of primary fragments are dissipated from the relative motion energy of two touching nuclei and exhibit a symmetric distribution along the fragment mass. The angular distribution of the projectile-like fragments moves forward with increasing beam energy. However, the target-like fragments exhibit an opposite trend. The shell effect is pronounced due to the fragment yields in multinucleon transfer reactions.
  • 摘要：The Rare Isotope Accelerator complex for ON-line experiments (RAON) is a new radioactive ion beam accelerator facility under construction in Korea. The large acceptance multi-purpose spectrometer (LAMPS) is one of the experimental devices for nuclear physics at RAON. It focuses on the nuclear symmetry energy at supra-saturation densities. The LAMPS Collaboration has developed and constructed various detector elements, including a time projection chamber (TPC) and a forward neutron detector array. From the positron beam test, the drift velocity of the secondary electrons in the TPC is 5.3 ± 0.2 cm/μs with P10 gas mixture, and the position resolution for pads with dimensions of 4 × 15 mm2 is in the range of ～ 0.6-0.8 mm, depending on the beam position. From the neutron beam test, the energy resolution of the prototype neutron detector module is determined to be 3.4％, and the position resolution is estimated to be better than 5.28 cm. At present, the construction of the LAMPS neutron detector system is in progress.
  • 摘要：Synthesis of superheavy elements beyond oganesson is facing new challenges as new target-projec-tile combinations are necessary. Guidance from models is thus expected for future experiments. However, hindered fusion models are not well established and predictions in the fission barriers span few MeVs. Consequently, predic-tions are not reliable. Strategies to constrain both fusion hindrance and fission barriers are necessary to improve the predictive power of the models. But, there is no hope to get an accuracy better than one order of magnitude in fusion-evaporation reactions leading to superheavy elements synthesis.
  • 摘要：Extracting the equation of state (EOS) and symmetry energy of dense neutron-rich matter from astrophysical observations is a long-standing goal of nuclear astrophysics. To facilitate the realization of this goal, the feasibility of using an explicitly isospin-depen-dent parametric EOS for neutron star matter was investi-gated recently in [1-3]. In this contribution, in addition to outlining the model framework and summarizing the most important findings from [1-3], we report a few new results regarding constraining parameters characterizing the high-density behavior of nuclear symmetry energy. In particular, the constraints on the pressure of neutron star matter extracted from combining the X-ray observations of the neutron star radius, the minimum-maximum mass M = 2.01 M☉, and causality condition agree very well with those extracted from analyzing the tidal deformability data by the LIGO + Virgo Collaborations. The limitations of using the radius and/or tidal deformability of neutron stars to constrain the high-density nuclear symmetry energy are discussed.
  • 摘要：We propose the construction of a compact linac as the injector of a cancer therapy facility at the Institute of Modern Physics (IMP) of the Chinese Academy of Sci-ences (CAS). Based on a traditional setup, a new compact fast-bunching design is first introduced to optimize the 600 keV/u RFQ with a 0.05 pmA 12C4+ beam. This shortens the RFQ structure length from the standard design value of 272-230 cm while effectively regulating the particle loss and emittance growth. In addition, a detailed error analysis was performed after the optimization process. The error sources cover input beam parameters errors, machining errors and alignment errors. The simulation results show that the beam loss and emittance growth of the RFQ are acceptable and within typical ranges of error.
  • 摘要：Finite element analysis (FEA) method was employed to perform three-dimensional (3D) electric field simulations for gas detectors with multiple wire electrodes. A new element refinement method developed for use in conjunction with the FEA program ANSYS allows suc-cessful meshing of the wires without physically inputting the wires in the chamber geometry. First, we demonstrate a model with only one wire, for which we calculate the potential distributions on the central plane and the end-cap region. The results are compared to the calculations obtained using GARFIELD, a two-dimensional program that uses the nearly exact boundary element method. Then we extend the method to same model, but with seven wires. Our results suggest that the new method can be applied easily to the 3D electric field calculations for complicated gas detectors with many wires and complicated geometrysuch as multiwire proportional chambers and time projec-tion chambers.
  • 21.Preface
    摘要：The 6^(th) International Workshop on Nuclear Dynamics in Heavy-ion Reactions(IWND2018)was held in Huzhou,Zhejiang Province,China during June 10^(th) to 14^(th),2018,jointly hosted by Huzhou University,Shanghai Institute of Applied Physics(SINAP),Beijing Normal University(BNU)and Shanghai Jiaotong University(SJTU).
  • 摘要：Dissipation retards fission, resulting in a drop in the first-chance fission probability of a fissioning nucleus with respect to its statistical model value. We use the Langevin model to compute the evolution of the drop (due to friction), Pdropf0 , for the fissioning systems 220Th and 240Cf with the presaddle friction strength (β). The first-chance fission probability is shown to depend sensitively on β, and the sensitivity is apparently greater than that of the total fission probability. We further find that although the total fission probability of heavy 240Cf is insensitive toβ, its first-chance fission probability is quite sensitive to β. These results suggest that, to strongly limit the presaddle friction strength, an optimal experimental avenue is to measure the first-chance fission probability of heavy fis-sioning nuclei.
  • 摘要：The effects of the in-medium nucleon-nucleon (NN) elastic cross section on the observables in heavy ion collisions in the Fermi energy domain are investigated within the framework of the ultrarelativistic quantum molecular dynamics model. The results simulated using medium correction factors of F = (σin-mediumNN =σfreeNN) = 0.2, 0.3, 0.5, and the density- and momentum-dependent factor obtained from the FU3FP1 parametrization are compared with the FOPI and INDRA experimental data. It is found that the calculations using the correction factors F = 0.2 and 0.5 reproduce the experimental data (i.e., collective flow and nuclear stopping) at 40 and 150 MeV/nucleon, respectively. Calculations with the FU3FP1 parametrization can best fit these experimental data. These conclusions can be confirmed in both 197Au +197 Au and 129Xe +120 Sn.
  • 摘要：Clustering is a general phenomenon observed in light nuclei, especially in neutron-rich nuclei in which molecular configurations can be formed with various combinations of valence neutrons. Thus far, many theo-retical models have been developed to describe nuclear clustering phenomena. These models are outlined in this review article, with an emphasis on their basic formulations and physical ingredients. In addition, various experimental tools, such as inelastic excitation and decay, transfer reactions, and resonant scattering reactions, have been applied to investigate the cluster structures inside the nucleus. Each tool possesses certain advantages and favorable applications, which are also described. In the case of neutron-rich nuclei, cluster structures may be configured as molecular states that form rotational bands with an extremely large moment of inertia and generate relatively large cluster decay width. The major experi-mental criteria for the identification of cluster formation are discussed herein.
  • 摘要：Herein, a feasible method is proposed to com-pensate the high-order effect during bunch length com-pression, thereby enhancing the peak current of a high-repetition-rate X-ray free-electron laser source. In the proposed method, the corrugated structure is inserted downstream of the high-order harmonic cavities to function as a passive linearizer and enhance the longitudinal profile of the electron beam. Three-dimensional simulations are performed to analyze the evolution of the longitudinal phase space, and the results demonstrate that the profile of the electron beam is improved and the peak current can be easily optimized to over 2 kA with a bunch charge of 100 pC.
  • 摘要：The betatron tune is an important parameter in a storage ring to enable stable operation. A tune adjustment tool with a small impact on the beam dynamics is useful for user operation and machine studies. Therefore, a tune knob is developed for the Hefei light source-Ⅱ (HLS-Ⅱ) storage ring. Owing to the compactness of the storage ring, a global adjustment mechanism is adopted. To reduce the impact on beam injection, only quadrupole families outside the injection section are used by the tune knob, and the βfunctions of the injection section remain unchanged. A code is developed based on the accelerator simulation software, MAD-X, to calculate the adjustment of the quadrupole strengths. The accelerator toolbox is used to double check the accuracy of the tune knob. Online mea-surement of the tune knob is also performed. The result shows that the tune knob works well when the tune is adjusted in a specific range. Betatron coupling measure-ment is also carried out, showing an application of the tune knob on machine studies. In this paper, the development of the tune knob and its experimental results in the HLS-Ⅱ storage ring are reported in detail.
  • 摘要：The nuclear mean-field potential built up during the 12C + 12C and 16O + 16O collisions at low energies relevant for the carbon- and oxygen-burning processes is constructed within the double-folding model (DFM) using the realistic ground-state densities of 12C and 16O, and CDM3Yn density-dependent nucleon-nucleon (NN) inter-action. The rearrangement term, indicated by the Hugen-holtz-van Hove theorem for the single-particle energy in nuclear matter, is properly considered in the DFM calcu-lation. To validate the use of the density-dependent NN interaction at low energies, an adiabatic approximation was suggested for the dinuclear overlap density. The reliability of the nucleus-nucleus potential predicted through this low-energy version of the DFM was tested in the optical model (OM) analysis of the elastic 12C + 12C and 16O + 16O scattering data at energies below 10 MeV/nucleon. These OM results provide a consistently good description of the elastic angular distributions and 90° excitation function. The dinuclear mean-field potential predicted by the DFM is further used to determine the astrophysical S factor of the 12C + 12C and 16O + 16O fusions in the barrier penetration model. Without any adjustment of the potential strength, our results reproduce the non-resonant behavior of the S factor of the 12C + 12C and 16O + 16O fusions very well over a wide range of energies.
  • 摘要：In recent years, the collective motion properties of global rotation of the symmetric colliding system in relativistic energies have been investigated. In addition, the initial geometrical shape effects on the collective flows have been explored using a hydrodynamical model, a transport model, etc. In this work, we study the asymmetric 12C +197Au collision at 200 GeV/c and the effect of the exotic nuclear structure on the global rotation using a multi-phase transport model. The global angular momen-tum and averaged angular speed were calculated and dis-cussed for the collision system at different evolution stages.
  • 摘要：TMSR uses nuclear graphite as a neutron mod-erator, a reflector, and the structural material, and utilizes molten salt as a coolant. When running normally, the graphite components are immersed in the molten salt. Thus, the nuclear graphite comes into direct contact with the molten salt, which infiltrates the open pores of the nuclear graphite. This infiltration may influence the stress analysis of the graphite component. In this study, a User Material subroutine was used to analyze the stress distri-bution of the graphite component, both with and without molten salt infiltration. Many influence factors were taken into consideration, such as the dose gradient, the shape of the permeation zone, and the permeation area. The results show that the dose gradient, shape, and area of the per-meation zone all significantly influence the stress distri-bution. Furthermore, the results of the stress analysis indicate that for a regular graphite component with a square cross section, the peak maximum principal stress value occurs at the center of the cross section, and the symmetry of the maximum principal stress distributions was modified by quarter circle and half ellipse permeation zones.
  • 摘要：This paper presents the determination of the fuel burnup distribution of the Dalat nuclear research reactor (DNRR) using a method of measurements at subcritical conditions. The method is based on the assumption of linear dependence of the reactivity on the burnup of fuel bundles and the measurements at subcritical conditions. The measurements were taken for seven selected fuel bundles in two different measuring sequences. The mea-sured burnup values have also been compared with the calculations for verifying the method and the measurement procedure. The results obtained with the three detectors have a good agreement with each other with a discrepancy less than 1.0％. The errors of the measured burnup values are within 6％. Comparison between the calculated and measured burnup values shows that the discrepancy of the C/E ratio is within 9％ compared to unity. The results indicate that the method of measurements at subcritical conditions could be well applied to determine the relative burnup distribution of the DNRR.

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    • • 卓越计划期刊
    • • 2015年度科学出版社"期刊出版质量优秀奖"
    • • 2016年中国国际影响力优秀学术期刊
    • • 2018年中国国际影响力优秀学术期刊
    • • 2018年上海"最具潜力英文期刊"

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