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Determination of the time resolution for neutron scintillation detectors by multi-coincidence measurement

Chinese Physics C 2011年第5期35卷 475-477页

作者：李永明阮锡超周斌马中原 State Key Laboratory of Nuclear Physics and Technology Peking University Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy

Based on the multi-coincidence measurement, the time resolution of three liquid scintillation detectors （BC501A） were determined strictly by solving the coincidence equations, where the influence from electronics estimated by self coincidence measurement as well as the background had been considered. The result of this work agreed well with the result that was deduced from the traditional method, and it will be helpful to analyze the energy resolution of neutron time of flight spectra measured by using such detectors at CIAE （China Institute of Atomic Energy）.

关键词： BC501A detectors multi-coincidence measurement time resolution

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Updated and revised neutron reaction data for ^(233)U

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Chinese Physics C 2013年第7期37卷 27-32页

作者：于保生陈国长张华曹文田唐国有陶曦 Laboratory of Science and Technology on Nuclear Data China Institute of Atomic Energy School of Physics & State Key Laboratory of Nuclear Physics and Technology Peking University

A complete set of n＋233U neutron reaction data from 10-6 eV-20 MeV is updated and revised based on the evaluated experimental data and the feedback information of various benchmark tests, The main revised quantities are nubars, cross sections as well as angular distributions, etc. The benchmark tests indicate that the present evaluated data achieve very promising results.

关键词： 233U nuclear data evaluation CENDL neutron

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Calculation and analysis of cross-sections for p+^(184)W reactions up to 200 MeV

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Chinese Physics C 2015年第8期39卷 43-49页

作者：孙建平张正军韩银录 Department of Physics Northwest University Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy

A set of optimal proton optical potential parameters for pd-lS4w reactions are obtained at incident proton energy up to 250 MeV. Based on these parameters, the reaction cross-sections, elastic scattering angular distributions, energy spectra and double differential cross sections of proton-induced reactions on lS4w are calculated and analyzed by using theoretical models which integrate the optical model, distorted Born wave approximation theory, intra- nuclear cascade model, exciton model, Hauser-Feshbach theory and evaporation model. The calculated results are compared with existing experimental data and good agreement is achieved.

关键词： reaction models elastic scattering angular distribution energy spectra double differential cross-section

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Measurement and simulation of the leakage neutron spectra from Fe spheres bombarded with 14 MeV neutrons

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nuclear science and Techniques 2023年第12期34卷 17-29页

作者： Qi Zhao Yang‑Bo Nie Yan‑Yan Ding Shi‑Yu Zhang Jie Ren Kuo‑Zhi Xu Xin‑Yi Pan Xi‑Chao Ruan Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China

Iron is commonly used as a structural and shielding material in nuclear devices. The accuracy of its nuclear data is critical for the design of nuclear devices. The evaluation data of ^(56)Fe isotopes in the latest version of the CENDL-3.2 library from China was significantly updated. This new data must be tested before it can be used. To test the reliability of this data and assess the shielding effect, a shielding benchmark experiment was conducted with natural Fe spherical samples using a pulsed deuterium–tritium neutron source at the China Institute of Atomic Energy(CIAE). The leakage neutron spectra from the natural spherical iron samples with different thicknesses(4.5, 7.5, and 12 cm) were measured between 0.8 and 16 MeV after interacting with 14 MeV neutrons using the time-of-flight method. The simulation results were obtained by Monte Carlo simulations by employing the Fe data from the CENDL-3.2, ENDF/B-VIII.0, and JEDNL-5.0 libraries. The measured and simulated leakage neutron spectra and penetration rates were compared, demonstrating that the CENDL-3.2 library performs sufficiently overall. The simulation results of the other two libraries were underestimated for scattering at the continuum energy level.

关键词： Iron sphere CENDL-3.2 Shielding benchmark experiment Pulsed 14 MeV neutron source Time-of-flight method

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Contrast sensitivity in 14 MeV fast neutron radiography

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nuclear science and Techniques 2017年第6期28卷 115-122页

作者： Chang-Bing Lu Jie Bao Ying Huang Peng Xu Xiong-Jun Chen Qi-Wei Zhang Xi-Chao Ruan Key Laboratory of Nuclear Data China Institute of Atomic Energy Xi'an Institute of High Technology Science and Technology Information Center China Academy of Engineering Physics

Fast neutron radiography(FNR) is an effective non-destructive testing *** to the scattering effect and low detection efficiency,the detection limit of FNR under certain conditions cannot be *** order to obtain the minimum detectable thickness by FNR,we studied the contrast sensitivity of FNR lead samples,both theoretically and *** then clarified the relationship between pixel value and irradiation time,and sample materials and *** experiment,using a4-cm-thick lead sample,verified our theoretical expression of FNR contrast sensitivity.

关键词： Fast neutron radiography Contrast sensitivity Experimental research

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Cumulative fission yield measurements with 14.7 MeV neutrons on ^(238)U

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Chinese Physics C 2023年第2期47卷 100-106页

作者：杨宪林兰长林聂阳波江历阳邱奕嘉葛裕杰陈红涛张凯魏玉婷王家豪姜功阮锡超杨毅 School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China

The fission yield data in the 14 MeV energy neutron induced fission of^(238)U play an important role in decay heat calculations and generation-Ⅳ reactor *** order to accurately measure fission product yields(FPYs)of^(238)U induced by 14 MeV neutrons,the cumulative yields of fission products ranging from^(92)Sr to^(147)Nd in the^(239)U(n,f) reaction with a 14.7 MeV neutron were determined using an off-line γ-ray spectrometric ***14.7 MeV quasi-monoenergetic neutron beam was provided by the K-400 D-T neutron generator at China Academy of Engineering Physics(CAEP).Fission products were measured by a low background high purity germanium gamma *** neutron flux was obtained from the^(93)Nb(n.2n)^(92m)Nb reaction,and the mean neutron energy was calculated using the cross-section ratios for the^(90)Zr(n,2n)^(89)Zr and^(93)Nb(n,2n)^(92m)Nb *** a series of corrections,high precision cumulative yields of 20 fission products were *** FPYs for the^(238)U(n,f) reaction at 14.7 MeV were compared with the existing experimental nuclear reaction data and evaluated nuclear data,*** results will be helpful in the design of a generation-Ⅳ reactor and the construction of evaluated fission yield databases.

关键词： ^(238)U fission yields DT neutron source activation method

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Organometallic-Inorganic Hybrid MXenes with Tunable Superconductivity

arXiv

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arXiv 2025年

作者： Fan, Qi Bo, Tao Guo, Wei Chen, Minghua Tang, Qing Yang, Yicong Li, Mian Chen, Ke Ge, Fangfang Li, Jialu Qiao, Sicong Wang, Changda Song, Li Yu, Lijing Guo, Jinghua Naguib, Michael Chai, Zhifang Huang, Qing Dun, Chaochao Kang, Ning Gogotsi, Yury Liang, Kun Zhejiang Key Laboratory of Data-Driven High-Safety Energy Materials and Applications Ningbo Key Laboratory of Special Energy Materials and Chemistry Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China University of Chinese Academy of Sciences 19 A Yuquan Rd Shijingshan District Beijing100049 China Qianwan Institute of CNITECH Ningbo315336 China Key Laboratory for the Physics and Chemistry of Nanodevices Department of Electronics Peking University Beijing100871 China Lawrence Berkeley National Laboratory BerkeleyCA94720 United States National Synchrotron Radiation Laboratory Key Laboratory of Precision and Intelligent Chemistry School of Nuclear Science and Technology University of Science and Technology of China Hefei230029 China Key Laboratory of Materials and Surface Technology Ministry of Education Sichuan Energy Equipment Intelligent Engineering Research Center School of Materials Science and Engineering Xihua University Chengdu610039 China Department of Physics and Engineering Physics Tulane University New OrleansLA70118 United States Department of Materials Science and Engineering A. J. Drexel Nanomaterials Institute Drexel University PhiladelphiaPA19104 United States

Ti-based two-dimensional transition-metal carbides (MXenes) have attracted attention due to their superior properties and are being explored across various applications1,2. Despite their versatile properties, superconductivity has never been demonstrated, not even predicted, for this important group of 2D materials. In this work, we have introduced an electrochemical intercalation protocol to construct versatile organometallic-inorganic hybrid MXenes and achieved tunable superconductivity in the metallocene-modified layered crystals. Through structural editing of MXene matrix at atomic scale and meticulously modulated intercalation route, Ti3C2Tx intercalated with metallocene species exhibits a superconductive transition temperature (Tc) of 10.2 K. Guest intercalation induced electron filling and strain engineering are responsible for the emerging superconductivity in this intrinsically non-superconducting material. Theoretically, simulated electron-phonon interaction effects further elucidate the nature of the changes in Tc. Furthermore, the Tc of crafted artificial superlattices beyond Ti-based MXenes have been predicted, offering a general strategy for engineering superconductivity and magnetism in layered hybrid materials. Copyright © 2025, The Authors. All rights reserved.

关键词： Electron-phonon interactions

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Neutron nuclear data evaluation of actinide nuclei for CENDL-3.1

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Chinese Physics C 2012年第9期36卷 823-826页

作者：陈国长曹文田于保生唐国有施兆民陶曦 Laboratory of Science and Technology on Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Physics&State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China

New evaluations for several actinide nuclei of the third version of Chinese Evaluated nuclear data Library for Neutron Reaction data （CENDL-3.1） have been completed and released. The evaluation is for all neutron induced reactions with uranium, neptunium, plutonium and americium in the mass range A-232-241, 236 239, 236-246 and 240-244, respectively, and cover the incident neutron energy up to 20 MeV. In the present evaluation, much more effort was devoted to improving the reliability of the evaluated nuclear data for available new measured data, especially scarce or absent experimental data. A general description for the evaluation of several actinides＇ data is presented.

关键词： actinide nuclear data evaluation CENDL neutron

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Determination of dosimetric characteristics for ^(125)I seed source with FLUKA code

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nuclear science and Techniques 2014年第6期25卷 84-86页

作者：曹振阮锡超孟贝蒂任杰陆小军 Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Zensun Sci & Tech Ltd. Shanghai Institute of Measurement and Testing Technology

This work determined a new Monte Carlo code(FLUKA) that can be used to calculate the dosimetric characteristics of seed sources. Dosimetric parameters(dose rate constant, radial dose function, and anisotropy function) of model 6711125 I seed source were calculated with FLUKA. The results were compared to the relative data recommended by AAPM TG43U1: dose rate constant with FLUKA was in agreement with 2.041%;radial dose functions with FLUKA for distances ranging from 0.5 cm to 10 cm, the deviation was less than 5%.Therefore the FLUKA code can be used to calculate the dosimetric characteristics of seed sources.

关键词：剂量学特性源代码粒子源测定蒙特卡洛各向异性剂量率计算

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Measurement of the(n,2n)reaction cross-sections of iodine and cesium induced by D-T neutrons with covariance analysis

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Chinese Physics C 2023年第9期47卷 86-94页

作者：兰长林牛玉鑫魏玉婷陆芳潇杨宪林续瑞瑞张玥葛裕杰王家豪姜功 School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China China National Nuclear Corporation Beijing 100045China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China

The cross-sections of the 127I(n,2n)126I and 133Cs(n,2n)132Cs reactions at neutron energies of 13.83±0.05,14.33±0.10,and 14.79±0.10 MeV were measured relative to the 93Nb(n,2n)92mNb reaction using the activation technique in combination with off-lineγ-ray spectrometry.A neutron beam was generated from the T(d,n)4He reaction using the K-400 neutron generator at the China Academy of Engineering *** the correlations between different attributes,detailed uncertainty propagation was performed using covariance analysis,and the cross-sections were reported with their uncertainties and correlation *** uncertainty of the measurement cross-sections ranged from 4.84 to 5.90%,which is lower than previous experimental ***,the theoretical excitation functions of the 127I(n,2n)126I and 133Cs(n,2n)132Cs reactions were calculated using the TALYS-1.95 and EMPIRE-3.2.3 ***,the experimentally determined cross-sections were analyzed by comparing them with literature data available in the EXFOR database and evaluated nuclear data in the ENDF/B-VIII.0,JEFF-3.3,JENDL-5,BROND-3.1,CENDL-3.2,and TENDL-2021 *** with the values previously reported in the 13.8-14.8 MeV energy region,the precision of the results obtained in this study was greatly *** current experimental results with thorough uncertainties and covariance information are critical for verifying the reliability of the theoretical model and improving the quality of the nuclear database.

关键词： 127I(n,2n)126I 133Cs(n,2n)132Cs cross-section neutron activation covariance analysis excitation function

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