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Development of a data-driven method to simulate the detector response of anti-neutron at BESIII

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2022年 1033卷

作者： Liu, Liang Zhou, Xiaorong Peng, Haiping Department of Modern Physics University of Science and Technology of China 230026 Hefei China State Key Laboratory of Particle Detection and Electronics 230026 Hefei China

In this paper, a data-driven method to precisely simulate the detector response of the anti-neutron depositing in the Electromagnetic Calorimeter (EMC) at BESIII is introduced. A large anti-neutron data sample can be selected using the decay J/psi -> p(n)over bar (pi)over bar from the BESIII data sample of 10 billion J/psi events. The detection efficiency for and various observables of anti-neutrons interacting in the EMC detector are simulated, taking the correlations among the variables into consideration. The systematic uncertainty of this data-driven simulation method is determined to be less than 1% on average. This method can be widely applied in physics processes that require precise simulation of the detector response of anti-neutrons in the EMC at BESIII. A similar method can be used to simulate other neutral particles, such as neutron and K-L.

关键词： Anti-neutron Electromagnetic calorimeter Detector simulation Data-driven BESIII

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n/γ discrimination for CLYC detector using a one-dimensional Convolutional Neural Network

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Journal of Instrumentation 2023年第1期18卷 P01021页

作者： Zhao, Keqing Feng, Changqing Wang, Shuwen Shen, Zhongtao Zhang, Kan Liu, Shubin State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China Department of Modern Physics University of Science and Technology of China Hefei230026 China

In this work, a one-dimensional convolutional neural network (1D-CNN) is used for performing pulse shape discrimination (PSD) between the neutrons and gamma rays detected by the Cs2LiYCl6: Ce3+(CLYC) crystal. We use three different optimizers to train the CNN for comparing the effects of different optimizers on the training results. The neural network that uses the RMSProp optimizer performed the best. The accuracy of the AmBe source reaches 99.395%, and the false alarm rates (FARs) of the gamma source, i.e., 137Cs and 22Na are only 0.003% and 0.020%, separately. By the same dataset, we introduced several other methods to compare, including the classic charge integral (CI), partial charge-to-peak ratio (PCPR), decision tree (DT), support vector machine (SVM), K-nearest neighbor (KNN), and artificial neural network (ANN). Among these introduced methods, the FARs of the ANN method are better, which are 0.004% and 0.031%;however, its error is higher than that of the CNN method. A detailed discussion of the discrimination capability as a function of the sampling rate of the digitizer is also presented. We compare the performance of the CNN method and the traditional integral method under different sampling rates. The results show that even under a low sampling rate, the discrimination of the CNN method is almost unchanged, while the accuracy of the traditional integral method deteriorates rapidly. In addition, the CNN method is used for classifying more complicated particles, neutrons, gamma-rays, noise, and pile-up waveforms. The classification results show that the CNN has the ability to separate the four signals from the dataset efficiently. © 2023 IOP Publishing Ltd and Sissa Medialab.

关键词： Support vector machines

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Feasibility study of CP violation inτ^(-)→Ksπ^(-)ντdecays at the Super Tau Charm Facility

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Chinese Physics C 2021年第5期45卷 29-38页

作者： Haoyu Sang Xiaodong Shi Xiaorong Zhou Xianwei Kang Jianbei Liu State Key Laboratory of Particle Detection and Electronics Hefei 230026China University of Science and Technology of China Hefei 230026China 'Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBejjing Normal UniversityBeijing 100875China Beijing Radiation Center Beiing 100875China

We report a feasibility study for violation inτ^(-)→Ksπ^(-)ντdecays at a Super Tau Charm Facility(STCF).With an expected luminosity of 1 ab-1 collected by STCF per year at a center-of-mass energy of 4.26 GeV,the statistical sensitivity for CP violation is determined to be of order 9.7×10^(-4)by measuring the decay-rate differ-ence betweenτ^(+)→Ksπ^(+)ντandτ^(-)→Ksπ^(-)ντ.The analysis is performed using a reliable fast simulation software package,which can describe the detector responses properly and vary the responses flexibly for further ***,the energy-dependent efficiencies for reconstructingτ^(-)→Ksπ^(-)ντare *** expected CP sens-itivity is proportional to 1/T in the energy region from 4.0 to 5.0 *** sensitivity of CP violation is of order 3.1×10^(-4)with 10 ab^(-1)integrated luminosity,which is equivalent to ten years'data taking in this energy region at STCF.

关键词： feasibility study tau CP violation STCF

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Effect of initial nuclear deformation on dielectron photoproduction in hadronic heavy-ion collisions

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Physical Review C 2023年第5期108卷 054906-054906页

作者： Jiaxuan Luo Xinbai Li Zebo Tang Xin Wu Wangmei Zha State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei 230026 China and Department of Modern Physics University of Science and Technology of China Hefei 230026 China

Significant excesses of e+e− pair production at very low transverse momentum (pT<0.15 GeV/c) were observed by the STAR collaboration in hadronic heavy-ion collisions. Such enhancement is assumed to be a sign of photon-photon production in heavy-ion collisions with hadronic overlap, based on comparisons with model calculations for spherical Au + Au collisions. However, there is a lack of calculations for e+e− pair production from coherent photon-photon interactions in hadronic U + U collisions, due to the deformity of uranium nuclei. In this article, we present calculations for e+e− pair photoproduction at sNN=193 GeV in both spherical and deformed U + U collisions within STAR detector acceptance using the equivalent photon approximation. We conduct event-by-event analysis to investigate the effects of initial nuclear deformation on pair production. Our numerical results show good agreement with experimental data for the 40%–60% and 60%–80% centrality classes in U + U collisions, and the differences between spherical and deformed configurations are approximately 3%. We also calculate the yields of the photoproduced e+e− pair in hadronic deformed Ru + Ru and Zr + Zr collisions at sNN=200 GeV. The results reveal that the ratios of the yields of Ru to Zr exhibit very small differences (<1%) between spherical and deformed cases.

关键词： Form factors Models & methods for nuclear reactions Nuclear charge distribution Photon, lepton & quark production Quark-gluon plasma Relativistic heavy-ion collisions 90 ≤ A ≤ 149 A ≥ 220

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Very low pT dimuon production in peripheral Au+Au collisions at √sNN = 200 GeV at STAR 41

Very low pT dimuon production in peripheral Au+Au collisions...

引用

41st International Conference on High Energy Physics, ICHEP 2022

作者： Li, Ziyang State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China No.96 JinZhai Road Hefei China Department of Modern Physics University of Science and Technology of China No.96 JinZhai Road Hefei China

We present the recent measurements of very low transverse momentum (pT) dilepton and J/ψ production in peripheral Au+Au collisions via the μ+μ- channel by the STAR experiment. Significant J/ψ and μ+μ- enhancements are observed at very low pT compared to the expectation of hadronic production. The comparison to model calculations is presented, and its physics implications are discussed. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Germanium compounds

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Reactor neutrino liquid xenon coherent elastic scattering experiment

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Physical Review D 2024年第7期110卷 072011页

作者： Chang Cai Guocai Chen Jiangyu Chen Rundong Fang Fei Gao Xiaoran Guo Jiheng Guo Tingyi He Chengjie Jia Gaojun Jin Yipin Jing Gaojun Ju Yang Lei Jiayi Li Kaihang Li Meng Li Minhua Li Shengchao Li Siyin Li Tao Li Qing Lin Jiajun Liu Minghao Liu Sheng Lv Guang Luo Jian Ma Chuanping Shen Mingzhuo Song Lijun Tong Xiaoyu Wang Wei Wang Xiaoping Wang Zihu Wang Yuehuan Wei Liming Weng Xiang Xiao Lingfeng Xie Dacheng Xu Jijun Yang Litao Yang Long Yang Jingqiang Ye Jiachen Yu Qian Yue Yuyong Yue Bingwei Zhang Shuhao Zhang Yifei Zhao Chenhui Zhu Department of Physics and Center for High Energy Physics Zhejiang 317112 China Sino-French Institute of Nuclear Engineering and Technology School of Physics State Key Laboratory of Particle Detection and Electronics Department of Modern Physics School of Science and Engineering School of Science Beijing Key Laboratory of Advanced Nuclear Materials and Physics Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics

Coherent elastic neutrino-nucleus scattering (CEνNS) provides a unique probe for neutrino properties beyond the Standard Model physics. The reactor neutrino liquid xenon coherent scattering experiment (RELICS), a proposed reactor neutrino program using liquid xenon time projection chamber technology, aims to investigate the CEνNS process of antineutrinos off xenon atomic nuclei. In this work, the design of the experiment is studied and optimized based on Monte Carlo simulations. To achieve a sufficiently low-energy threshold for CEνNS detection, an ionization-only analysis channel is adopted for RELICS. A high emission rate of delayed electrons after a big ionization signal is the major background, leading to an analysis threshold of 120 photoelectrons in the CEνNS search. The second largest background, nuclear recoils induced by cosmic-ray neutrons, is suppressed via a passive water shield. The physics potential of RELICS is explored with a 30 kg·yr exposure at a baseline of 25 m from a reactor core with a 3 GW thermal power. In an energy range of 120–300 photoelectrons, corresponding to an average nuclear recoil from 0.63 to 1.36 keV considering the liquid xenon response and detector-related effect, we expect 4639.7 CEνNS and 1687.8 background events. The sensitivity of RELICS to the weak mixing angle is investigated at a low momentum transfer. Our study shows that RELICS can further improve the constraints on the nonstandard neutrino interaction compared to the current best results.

关键词： Neutrino detection

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Graded composition and doping p-i-n Al_(x)Ga_(1−x)As/GaAs detector for unbiased voltage operation

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Nuclear Science and Techniques 2022年第7期33卷 73-82页

作者： Zhi-Fu Zhu Ji-Jun Zou Zhi-Jia Sun He Huang Qing-Lei Xiu Zhong-Ming Zhang Yong Gan Chen-Xian Guo Shao-Tang Wang Xiu-Ping Yue Guo-Li Kong School of Information Engineering Zhengzhou University of TechnologyZhengzhou450044China Engineering Research Center of Nuclear Technology Application(East China University of Technology) Ministry of EducationNanchang330013China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China Engineering Department LA14YWLancaster UniversityLancasterUK

p-i-n Al_(x)Ga_(1−x)As/GaAs detectors with graded compositions and graded doping were grown and *** the current-voltage and capacitance-voltage measurement results,the devices had good p-n junction diode characteristics,and the electric field strength under an unbiased voltage was 1.7×10^(5) Vcm^(-1).The full width at half maximum and charge collection efficiency of the detectors obtained from energy spectrum measurements of 5.48-MeV alpha particles were 3.04 and approximately 93%,*** this study,we created the most advanced and promising state-of-the-art unbiased detector reported to date.

关键词： Graded composition Graded doping Detector p-i-n Al_(x)Ga_(1−x)As/GaAs

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A Light Yield Enhancement Method Using Wavelength Shifter for the STCF EMC

arXiv

引用

arXiv 2022年

作者： Jia, Zekun Yu, Hanlin Mo, Hongkun Song, Yong Shen, Zhongtao Zhang, Yunlong Liu, Jianbei Peng, Haiping State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China

Super Tau-Charm Facility (STCF) is a next-generation high luminosity electron-positron collider facility and is currently one of the major options for accelerator-based particle physics experiment in China. The crystal-based electromagnetic calorimeter (EMC) with undoped CsI is a major sub-system of the STCF spectrometer. To fulfill the increasing physics requirements on measurement precision and the suffering of radiation, improving the detected light yield is an important task of STCF EMC R&D. This paper studies a "wavelength shifting in propagation" scheme for STCF EMC using the nanostructured organosilicon luminophore (NOL). The studies are performed by both Monte Carlo simulation and experimental tests. The light yield is proved to be improved by 159 %in the experiment. Meanwhile, a study of the NOL’s radiation hardness is carried out to verify the reliability of the NOL. No obvious degradation in the performance is observed with the total ionization dose up to 100 krad, far beyond the total radiation dose of STCF with ten years of operation. © 2022, CC BY.

关键词： Cesium iodide

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Measurements of the boron-to-carbon and boron-to-oxygen flux ratios in cosmic rays with DAMPE 38

Measurements of the boron-to-carbon and boron-to-oxygen flux...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Yue, Chuan Chen, Zhan-Fang Kyratzis, Dimitrios Parenti, Andrea Wei, Yi-Feng Yuan, Qiang Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing210034 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China Via Iacobucci 2 L’AquilaI-67100 Italy Laboratori Nazionali del Gran Sasso Assergi L’AquilaI-67100 Italy State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China

Boron nuclei in cosmic rays (CRs) are believed to be mainly produced by the fragmentation of heavier nuclei, such as carbon and oxygen, via collisions with the interstellar matter. Therefore, the boron-to-carbon flux ratio (B/C) and the boron-to-oxygen flux ratio (B/O) are very essential probes of the CR propagation. With a large geometric factor and a good charge resolution, the DArk Matter particle Explorer (DAMPE), is expected to extend the measurement of B/C and B/O up to a few TeV/n energies. In this contribution, the direct measurements of B/C and B/O in the energy range from 10 GeV/n to 5.6 TeV/n with six years of data collected by DAMPE are presented. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Damping

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Crown Ether-Based Cloud Point Extraction for Lead-212 Enrichment from Thorium Series

SSRN

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SSRN 2024年

作者： Cao, Shiquan Hao, Baijia Chen, Zhi School of Nuclear Science and Technology University of Science and Technology of China Hefei230026 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China

An innovative cloud point extraction (CPE) method was proposed for the extraction and enrichment of the medically valuable radionuclide lead-212 from thorium decay series nuclides. This method employed 4',4''(5'')-di-tert-butyldicyclohexyl-18-crown-6 (DtBuDC18C6), which had a high selectivity for Pb, as the chelating agent. In the experiments, Triton X-114 and cetyltrimethylammonium bromide (CTAB) were used as surfactants. The study systematically examined the effects of nitric acid concentration, chelating agent concentration, amounts of non-ionic and ionic surfactants on the extraction efficiency of Pb, and optimization was performed. The results indicated that the optimal conditions were 0.1 mol/L HNO3, 370 μM DtBuDC18C6, 1200 μM Triton X-114, and 30 μM CTAB. Even in the presence of high concentrations of thorium, this method achieved a Pb extraction efficiency of 96% and a recovery rate of 98±5% through ammonium citrate stripping. Moreover, the 210Pb tracer was used to study the CPE process, and gamma spectrometry indicated that the chemical recovery rate of 210Pb was greater than 53.8%. The interactions between thorium series nuclides and DtBuDC18C6 were finally calculated by density functional theory (DFT), and the selective enrichment capability of the CPE system for Pb was further validated. In conclusion, this was possibly the first study to use CPE to extract the medical isotope lead-212 from thorium decay series nuclides, highlighting significant scientific and practical potential. © 2024, The Authors. All rights reserved.

关键词： Crown ethers

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