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arXiv 2025年

作者： Peng, Ji Zhao, Mingrui Wang, Xiaolin Ruan, Manqi Li, Hengne Chen, Shanzhen Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Beijing100049 China Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Guangzhou510631 China

A precise determination of the CKM angle γ from Bs0 oscillations in Bs0 → DsK± decays offers a critical test of the Standard Model and probes for new physics. We present a comprehensive study on the prospects of measuring γ at a future Tera-Z factory, utilizing the baseline detector concept of the Circular Electron Positron Collider (CEPC). A two-dimensional joint fit framework, incorporating flavor tagging, decay time resolution modeling, and acceptance corrections, is developed using full Monte Carlo simulations of Bs0 → Ds (→ KK±π) K± decays and inclusive background processes. The effective flavor tagging power reaches 23.6%, while the decay time resolution is determined to be 26 fs. Projecting to full statistics of signal events across three dominant Ds− decay channels, we estimate a statistical precision of σ(γ) = 0.69◦, which is corresponding to 4.1 Tera Z boson equivalent data. This study establishes the feasibility of sub-degree level γ measurements at a Z-factory, highlighting its unique advantages in time-dependent CP violation studies through ultra-precise vertexing and background suppression capabilities. Copyright © 2025, The Authors. All rights reserved.

关键词： Colliding beam accelerators

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The excitation functions of ^(187)Re(n,2n)^(186m,g)Re reactions

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Chinese Physics C 2016年第8期40卷 55-61页

作者：黄小龙康梦霄刘丽乐王记民陈雄军 Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy

A new value for the emission probability of 137.144 keV γ-rays from 186gRe decay is recommended to be （9.47±0.03）/%. Using this value the measured cross sections for 187Re（n,2n）186mRe and 187Re（n,2n）186gRe reactions around 14 MeV are analyzed, and the cross section for187Ke（n,2n）186m＋gRe reaction at 14.g MeV is （2213=k116） mb. The UNF code was adopted to calculate the cross sections for the 187Re（n,2n）186m＋gRe reaction below 20 MeV, fitting to the value （2213±116） mb at 14.8 MeV using a set of optimum neutron optical potential parameters which were obtained based on the relevant experimental data of rhenium. The isomeric cross section ratio for the 187Re（n,2n）186m,gRe reaction was analyzed using the V-H method based on nuclear statistical theory. Combining these calculated results, the excitation functions for the 187Re（n,2n）lS6mRe and 187Re（n,2n）186gRe reactions were obtained. The obtained results are in good agreement with the available experimental data.

关键词： excitation function isomeric cross section 187Re（n,2n）186m,gRe reaction

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

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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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