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Ballistic deficit compensation method for a large-volume HPGe detector at high count rates

nuclear Science and Techniques 2016年第3期27卷 123-131页

作者： Chuan-Yun Xiong Ming-Zhe Liu Zhuo Zuo Xian-Guo Tuo State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China

A large-volume HPGe detector normally has a severe ballistic deficit due to its long rise time of the output *** the trapezoidal shaping algorithm adopted as a remedy to deal with the signals,the algorithm cannot fully eliminate the ballistic deficit in the case of a high counting *** resolve the problem,we propose a ballistic deficit compensation method that is based on the measurement of rise time of the signals before *** find that the ballistic deficit after trapezoidal shaping has little relation to the time constant,but shows a quadratic relationship with the rise time and has a negative correlation with the shaping *** the case of high count rates,the high resolution is handled by fitting the curve to the rise time and the amplitude deficit of the signal after shaping and by compensating for the signal amplitude after trapezoidal *** indicate that when the count rate is about 100 kcps,the resolution of Co-60 improves from traditional 2.32 up to 1.91 keV,thus reaching a higher level.

关键词：高计数率补偿方法 HPGe探测器亏损弹道大体积输出信号上升时间

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Correction: A chest CT-based nomogram for predicting survival in acute myeloid leukemia

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BMC cancer 2024年第1期24卷 562页

作者： Xiaoping Yi Huien Zhan Jun Lyu Juan Du Min Dai Min Zhao Yu Zhang Cheng Zhou Xin Xu Yi Fan Lin Li Baoxia Dong Xinya Jiang Zeyu Xiao Jihao Zhou Minyi Zhao Jian Zhang Yan Fu Tingting Chen Yang Xu Jie Tian Qifa Liu Hui Zeng Department of Radiology Xiangya Hospital Central South University Changsha China. National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology Xiangya Hospital Changsha China. National Clinical Research Center for Geriatric Disorders (Xiangya Hospital) Central South University Changsha China. Hunan Key Laboratory of Skin Cancer and Psoriasis Xiangya Hospital Central South University Changsha China. Hunan Engineering Research Center of Skin Health and Disease Xiangya Hospital Central South University Changsha China. Department of Dermatology Xiangya Hospital Central South University Changsha China. Department of Hematology The First Affiliated Hospital of Jinan University Guangzhou China. Department of Clinical Research The First Affiliated Hospital of Jinan University Guangzhou China. Department of Hematology Nanfang Hospital Southern Medical University Guangzhou China. Department of Nuclear Medicine The Third Xiangya Hospital Central South University Changsha China. Department of Hematology Xiangya Hospital Central South University Changsha China. Department of Geriatrics Guangzhou First People's Hospital School of Medicine South China University of Technology Guangzhou China. Department of Hematology The First Affiliated Hospital of Soochow University Suzhou China. Department of Hematology Hunan Provincial People' Hospital The First Affiliated Hospital of Hunan Normal University Changsha China. Department of Hematology Shanghai General Hospital Shanghai Jiaotong University School of Medicine Shanghai China. The Guangzhou Key Laboratory of Molecular and Functional Imaging for Clinical Translation The First Affiliated Hospital of Jinan University Guangzhou China. Department of Hematology Shenzhen People's Hospital Second Clinical Medical College of Jinan University First Affiliated Hospital of Southern University of Science and Technology Shenzhen China. Department of Hematology The Seventh Affiliated Hospital Sun Yat-

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Publisher Correction: Transverse emittance reduction in muon beams by ionization cooling

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Nature Physics 2024年 1687页

作者： M. Bogomilov R. Tsenov G. Vankova-Kirilova Y. P. Song J. Y. Tang Z. H. Li R. Bertoni M. Bonesini F. Chignoli R. Mazza A. de Bari D. Orestano L. Tortora Y. Kuno H. Sakamoto A. Sato S. Ishimoto M. Chung C. K. Sung F. Filthaut M. Fedorov D. Jokovic D. Maletic M. Savic N. Jovancevic J. Nikolov M. Vretenar S. Ramberger R. Asfandiyarov A. Blondel F. Drielsma Y. Karadzhov S. Boyd J. R. Greis T. Lord C. Pidcott I. Taylor G. Charnley N. Collomb K. Dumbell A. Gallagher A. Grant S. Griffiths T. Hartnett B. Martlew A. Moss A. Muir I. Mullacrane A. Oates P. Owens G. Stokes P. Warburton C. White D. Adams V. Bayliss J. Boehm T. W. Bradshaw C. Brown M. Courthold J. Govans T. Hayler M. Hills J. B. Lagrange C. Macwaters A. Nichols R. Preece S. Ricciardi C. Rogers T. Stanley J. Tarrant M. Tucker S. Watson A. Wilson R. Bayes J. C. Nugent F. J. P. Soler G. T. Chatzitheodoridis A. J. Dick K. Ronald C. G. Whyte A. R. Young R. Gamet P. Cooke V. J. Blackmore D. Colling A. Dobbs P. Dornan P. Franchini C. Hunt P. B. Jurj A. Kurup K. Long J. Martyniak S. Middleton J. Pasternak M. A. Uchida J. H. Cobb C. N. Booth P. Hodgson J. Langlands E. Overton V. Pec P. J. Smith S. Wilbur M. Ellis R. B. S. Gardener P. Kyberd J. J. Nebrensky A. DeMello S. Gourlay A. Lambert D. Li T. Luo S. Prestemon S. Virostek M. Palmer H. Witte D. Adey A. D. Bross D. Bowring A. Liu D. Neuffer M. Popovic P. Rubinov B. Freemire P. Hanlet D. M. Kaplan T. A. Mohayai D. Rajaram P. Snopok Y. Torun L. M. Cremaldi D. A. Sanders L. R. Coney G. G. Hanson C. Heidt Department of Atomic Physics St Kliment Ohridski University of Sofia Sofia Bulgaria Institute of High Energy Physics Chinese Academy of Sciences Beijing China Sichuan University Chengdu China Sezione INFN Milano Bicocca Dipartimento di Fisica G. Occhialini Milano Italy Sezione INFN Pavia and Dipartimento di Fisica Università di Pavia Pavia Italy INFN Sezione di Roma Tre and Dipartimento di Matematica e Fisica Università Roma Tre Roma Italy Department of Physics Graduate School of Science Osaka University Toyonaka Japan High Energy Accelerator Research Organization (KEK) Institute of Particle and Nuclear Studies Tsukuba Japan Pohang University of Science & Technology Pohang Korea Nikhef Amsterdam The Netherlands Radboud University Nijmegen The Netherlands Institute of Physics University of Belgrade Belgrade Serbia Faculty of Sciences University of Novi Sad Novi Sad Serbia CERN Geneva Switzerland DNPC Section de Physique Université de Genève Geneva Switzerland Department of Physics University of Warwick Coventry UK STFC Daresbury Laboratory Daresbury Cheshire UK STFC Rutherford Appleton Laboratory Harwell Oxford Didcot UK College of Engineering Design and Physical Sciences Brunel University Uxbridge UK School of Physics and Astronomy University of Glasgow Glasgow UK SUPA and the Department of Physics University of Strathclyde Glasgow UK Cockcroft Institute Daresbury Laboratory Daresbury UK Department of Physics University of Liverpool Liverpool UK Department of Physics Blackett Laboratory Imperial College London London UK Department of Physics University of Oxford Oxford UK Department of Physics and Astronomy University of Sheffield Sheffield UK Lawrence Berkeley National Laboratory Berkeley CA USA Brookhaven National Laboratory Upton NY USA Fermilab Batavia IL USA Illinois Institute of Technology Chicago IL USA University of Mississippi Oxford MS USA University of California Riverside CA USA

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Molecular Spring‐like Triple‐Helix Coordination Polymers as Dual‐Stress and Thermally Responsive Crystalline Metal–Organic Materials

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Angewandte Chemie 2020年第37期132卷

作者： Lei Mei Shu‐wen An Kong‐qiu Hu Lin Wang Ji‐pan Yu Zhi‐wei Huang Xiang‐he Kong Chuan‐qin Xia Zhi‐fang Chai Wei‐qun Shi Laboratory of Nuclear Energy Chemistry Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China College of Chemistry Sichuan University Chengdu 610064 China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Industrial Technology Chinese Academy of Sciences Ningbo 315201 China

Elastic metal–organic materials (MOMs) capable of multiple stimuli‐responsiveness based on dual‐stress and thermally responsive triple‐helix coordination polymers are presented. The strong metal‐coordination linkage and the flexibility of organic linkers in these MOMs, rather than the 4 Å stacking interactions observed in organic crystals, causes the helical chain to act like a molecular spring and thus accounts for their macroscopic elasticity. The thermosalient effect of elastic MOMs is reported for the first time. Crystal structure analyses at different temperatures reveal that this thermoresponsiveness is achieved by adaptive regulation of the triple‐helix chains by fine‐tuning the opening angle of flexible V‐shaped organic linkers and rotation of its lateral conjugated groups to resist possible expansion, thus demonstrating the vital role of adaptive reorganization of triple‐helix metal–organic chains as a molecular spring‐like motif in crystal jumping.

关键词： elastic flexing mechanical responsiveness metal–organic materials molecular springs thermosalient effect

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Results of dark matter search using the Full Pandax-II exposure

arXiv

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arXiv 2020年

作者： Wang, Qiuhong Abdukerim, Abdusalam Chen, Wei Chen, Xun Chen, Yunhua Cheng, Chen Cui, Xiangyi Fan, Yingjie Fang, Deqing Fu, Changbo Fu, Mengting Geng, Lisheng Giboni, Karl Gu, Linhui Guo, Xuyuan Han, Ke He, Changda He, Shengming Huang, Di Huang, Yan Huang, Yanlin Huang, Zhou Ji, Xiangdong Ju, Yonglin Li, Shuaijie Liu, Huaxuan Liu, Jianglai Ma, Wenbo Ma, Yugang Mao, Yajun Meng, Yue Ni, Kaixiang Ning, Jinhua Ning, Xuyang Ren, Xiangxiang Shang, Changsong Si, Lin Shen, Guofang Tan, Andi Wang, Anqing Wang, Hongwei Wang, Meng Wang, Siguang Wang, Wei Wang, Xiuli Wang, Zhou Wu, Mengmeng Wu, Shiyong Wu, Weihao Xia, Jingkai Xiao, Mengjiao Xie, Pengwei Yan, Binbin Yang, Jijun Yang, Yong Yu, Chunxu Yuan, Jumin Yuan, Ying Yue, Jianfeng Zeng, Xinning Zhang, Dan Zhang, Tao Zhao, Li Zheng, Qibin Zhou, Jifang Zhou, Ning Zhou, Xiaopeng INPAC and School of Physics and Astronomy Shanghai Jiao Tong University MOE Key Lab for Particle Physics Astrophysics and Cosmology Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai200240 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China University of Chinese Academy of Sciences Beijing100049 China Shanghai Jiao Tong University Sichuan Research Institute Chengdu610213 China Yalong River Hydropower Development Company Ltd. 288 Shuanglin Road Chengdu610051 China School of Physics Sun Yat-Sen University Guangzhou510275 China Tsung-Dao Lee Institute Shanghai200240 China School of Physics Nankai University Tianjin300071 China Institute of Modern Physics Fudan University Shanghai200433 China School of Physics Peking University Beijing100871 China School of Physics Beihang University Beijing100191 China International Research Center for Nuclei and Particles in the Cosmos Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing100191 China School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai200093 China Department of Physics University of Maryland College ParkMD20742 United States School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China Shandong University Jinan250100 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201210 China Center of High Energy Physics Peking University Beijing100871 China

We report the dark matter search results using the full 132 ton·day exposure of the PandaX-II experiment, including all data from March 2016 to August 2018. No significant excess of events were identified above the expected background. Upper limits are set on the spin-independent dark matter-nucleon interactions. The lowest 90% confidence level exclusion on the spin-independent cross section is 2.0 × 10−46 cm2 at a WIMP mass of 15 GeV/c2. Copyright © 2020, The Authors. All rights reserved.

关键词： Germanium alloys

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Design and stability factors analysis of electro-hydraulic driving system for load-sensing electro-hydraulic robot

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IOP Conference Series: Materials Science and engineering 2018年第6期392卷

作者： C Y Zhang G Z Chen C W Miao Y F Zhao S Zhong College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu P.R.China

Aiming at the shortage of electro-hydraulic robot in terms of system fluctuation and response speed compared with electric robot. The static and dynamic characteristics of a load-sensitive electro-hydraulic robot electro-hydraulic driving system are simulated based on AMESim software in this paper. By analysing the static and dynamic characteristics of the system, the theoretical knowledge is combined with the simulation results. The factors that affect the stability of the system are emphatically explored to provide ideas for optimizing and improving the stability of the electro-hydraulic driving system of load-sensitive electro-hydraulic robots.

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Experimental study on bubble behavior and flow structure in pool condition 17

Experimental study on bubble behavior and flow structure in ...

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17th International Topical Meeting on nuclear Reactor Thermal Hydraulics, NURETH 2017

作者： Meng, Tao Tan, Sichao Cheng, Kun Wen, Jing Fundamental Science on Nuclear Safety and Simulation Technology Laboratory College of Nuclear Science and Technology Harbin Engineering University 145 Nantong Street Harbin150001 China Nuclear Power Institute of China Chengdu610213 China

This paper is concerned with bubble behavior and bubble wake structure by using particle tracers. Air bubbles are generated in a tank filled with tap water, and then the flow field around the air bubbles is visualized by distributing fluorescent particle tracers in the water. This kind of particles enable us to filter reflected laser light and observe the flow field directly. We present that there is a rectilinear rising stage for sequential bubbles rising from a single orifice and the length of rectilinear rising is negatively correlated with the gas flow rate. In this stage, bubbles have predominantly horizontal and vertical deformation so that the flow field nearby is regular and repeatable to some extent. A larger gas flow rate will induce larger bubbles, which will make bubbles have more complicated deformation sooner and a shorter rectilinear rising stage. Furthermore, a clear counter-rotating vortices structure is observed at the equatorial edges of the rising bubble in the initial stage and two vortices shedding patterns are also found. One of which is thought to be the cause of the generation of the horse-shoe type vortices. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Flow fields

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Common Limitations of Image Processing Metrics: A Picture Story

arXiv

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arXiv 2021年

作者： Reinke, Annika Tizabi, Minu D. Sudre, Carole H. Eisenmann, Matthias Rädsch, Tim Baumgartner, Michael Acion, Laura Antonelli, Michela Arbel, Tal Bakas, Spyridon Bankhead, Peter Benis, Arriel Blaschko, Matthew Buettner, Florian Cardoso, M. Jorge Chen, Jianxu Cheplygina, Veronika Christodoulou, Evangelia Cimini, Beth A. Collins, Gary S. Engelhardt, Sandy Farahani, Keyvan Ferrer, Luciana Galdran, Adrian van Ginneken, Bram Glocker, Ben Godau, Patrick Haase, Robert Hamprecht, Fred Hashimoto, Daniel A. Heckmann-Nötzel, Doreen Hirsch, Peter Hoffman, Michael M. Huisman, Merel Isensee, Fabian Jannin, Pierre Kahn, Charles E. Kainmueller, Dagmar Kainz, Bernhard Karargyris, Alexandros Karthikesalingam, Alan Kavur, A. Emre Kenngott, Hannes Kleesiek, Jens Kleppe, Andreas Koehler, Sven Kofler, Florian Kopp-Schneider, Annette Kooi, Thijs Kozubek, Michal Kreshuk, Anna Kurc, Tahsin Landman, Bennett A. Litjens, Geert Madani, Amin Maier-Hein, Klaus Martel, Anne L. Mattson, Peter Meijering, Erik Menze, Bjoern Moher, David Moons, Karel G.M. Müller, Henning Nichyporuk, Brennan Nickel, Felix Noyan, M. Alican Petersen, Jens Polat, Gorkem Rafelski, Susanne M. Rajpoot, Nasir Reyes, Mauricio Rieke, Nicola Riegler, Michael A. Rivaz, Hassan Saez-Rodriguez, Julio Sánchez, Clara I. Schroeter, Julien Saha, Anindo Selver, M. Alper Sharan, Lalith Shetty, Shravya Smeden, Maarten V.A.N. Stieltjes, Bram Summers, Ronald M. Taha, Abdel A. Tiulpin, Aleksei Tsaftaris, Sotirios A. Calster, Ben V.A.N. Varoquaux, Gaël Wiesenfarth, Manuel Yaniv, Ziv R. Jäger, Paul Maier-Hein, Lena Division of Intelligent Medical Systems and HI Helmholtz Imaging Heidelberg Germany Faculty of Mathematics and Computer Science Heidelberg University Heidelberg Germany Division of Intelligent Medical Systems Heidelberg Germany NCT Heidelberg DKFZ University Medical Center Heidelberg Germany MRC Unit for Lifelong Health and Ageing UCL Centre for Medical Image Computing Department of Computer Science University College London London United Kingdom School of Biomedical Engineering and Imaging Science King’s College London London United Kingdom Division of Medical Image Computing Heidelberg Germany Instituto de Cálculo CONICET – Universidad de Buenos Aires Buenos Aires Argentina Centre for Medical Image Computing University College London London United Kingdom McGill University Montréal Canada Division of Computational Pathology Dept of Pathology & Laboratory Medicine Indiana University School of Medicine IU Health Information and Translational Sciences Building Indianapolis United States University of Pennsylvania Richards Medical Research Laboratories FL7 PhiladelphiaPA United States Institute of Genetics and Cancer University of Edinburgh Edinburgh United Kingdom Department of Digital Medical Technologies Holon Institute of Technology Holon Israel European Federation for Medical Informatics Le Mont-sur-Lausanne Switzerland Center for Processing Speech and Images Department of Electrical Engineering KU Leuven Kasteelpark Arenberg 10 - box 2441 Leuven3001 Belgium Frankfurt/Mainz DKFZ UCT Frankfurt-Marburg Germany Heidelberg Germany Goethe University Frankfurt Department of Medicine Germany Goethe University Frankfurt Department of Informatics Germany Frankfurt Cancer Insititute Germany Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V. Dortmund Germany Department of Computer Science IT University of Copenhagen Copenhagen Denmark Imaging Platform Broad Institute of MIT and Harvard CambridgeMA United States Centre for St

While the importance of automatic image analysis is continuously increasing, recent meta-research revealed major flaws with respect to algorithm validation. Performance metrics are particularly key for meaningful, objective, and transparent performance assessment and validation of the used automatic algorithms, but relatively little attention has been given to the practical pitfalls when using specific metrics for a given image analysis task. These are typically related to (1) the disregard of inherent metric properties, such as the behaviour in the presence of class imbalance or small target structures, (2) the disregard of inherent data set properties, such as the non-independence of the test cases, and (3) the disregard of the actual biomedical domain interest that the metrics should reflect. This living dynamically document has the purpose to illustrate important limitations of performance metrics commonly applied in the field of image analysis. In this context, it focuses on biomedical image analysis problems that can be phrased as image-level classification, semantic segmentation, instance segmentation, or object detection task. The current version is based on a Delphi process on metrics conducted by an international consortium of image analysis experts from more than 60 institutions worldwide. © 2021, CC BY.

关键词： Medical imaging

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Multiple Coulomb scattering of muons in lithium hydride

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Physical Review D 2022年第9期106卷 092003-092003页

作者： M. Bogomilov R. Tsenov G. Vankova-Kirilova Y. P. Song J. Y. Tang Z. H. Li R. Bertoni M. Bonesini F. Chignoli R. Mazza V. Palladino A. de Bari D. Orestano L. Tortora Y. Kuno H. Sakamoto A. Sato S. Ishimoto M. Chung C. K. Sung F. Filthaut M. Fedorov D. Jokovic D. Maletic M. Savic N. Jovancevic J. Nikolov M. Vretenar S. Ramberger R. Asfandiyarov A. Blondel F. Drielsma Y. Karadzhov G. Charnley N. Collomb K. Dumbell A. Gallagher A. Grant S. Griffiths T. Hartnett B. Martlew A. Moss A. Muir I. Mullacrane A. Oates P. Owens G. Stokes P. Warburton C. White D. Adams V. Bayliss J. Boehm T. W. Bradshaw C. Brown M. Courthold J. Govans M. Hills J.-B. Lagrange C. Macwaters A. Nichols R. Preece S. Ricciardi C. Rogers T. Stanley J. Tarrant M. Tucker S. Watson A. Wilson R. Bayes J. C. Nugent F. J. P. Soler R. Gamet P. Cooke V. J. Blackmore D. Colling A. Dobbs P. Dornan P. Franchini C. Hunt P. B. Jurj A. Kurup K. Long J. Martyniak S. Middleton J. Pasternak M. A. Uchida J. H. Cobb C. N. Booth P. Hodgson J. Langlands E. Overton V. Pec P. J. Smith S. Wilbur G. T. Chatzitheodoridis A. J. Dick K. Ronald C. G. Whyte A. R. Young S. Boyd J. R. Greis T. Lord C. Pidcott I. Taylor M. Ellis R. B. S. Gardener P. Kyberd J. J. Nebrensky M. Palmer H. Witte D. Adey A. D. Bross D. Bowring P. Hanlet A. Liu D. Neuffer M. Popovic P. Rubinov A. DeMello S. Gourlay A. Lambert D. Li T. Luo S. Prestemon S. Virostek B. Freemire D. M. Kaplan T. A. Mohayai D. Rajaram P. Snopok Y. Torun L. M. Cremaldi D. A. Sanders D. J. Summers L. R. Coney G. G. Hanson C. Heidt Department of Atomic Physics St. Kliment Ohridski University of Sofia 5 James Bourchier Blvd Sofia Bulgaria Institute of High Energy Physics Chinese Academy of Sciences 19 Yuquan Rd Shijingshan District Beijing China Sichuan University 252 Shuncheng St Chengdu China Sezione INFN Milano Bicocca and Dipartimento di Fisica G. Occhialini Piazza della Scienza 3 Milano Italy Sezione INFN Napoli and Dipartimento di Fisica Università Federico II Complesso Universitario di Monte S. Angelo via Cintia Napoli Italy Sezione INFN Pavia and Dipartimento di Fisica Università di Pavia Via Agostino Bassi 6 Pavia Italy Sezione INFN Roma Tre and Dipartimento di Matematica e Fisica Università Roma Tre Via della Vasca Navale 84 Roma Italy Osaka University Graduate School of Science Department of Physics 1-1 Machikaneyamacho Toyonaka Osaka Japan High Energy Accelerator Research Organization (KEK) Institute of Particle and Nuclear Studies Tsukuba Ibaraki Japan Department of Physics UNIST 50 UNIST-gil Ulsan South Korea NIKHEF Science Park 105 Amsterdam Netherlands Radboud University Houtlaan 4 Nijmegen Netherlands Institute of Physics University of Belgrade Serbia Faculty of Sciences University of Novi Sad Trg Dositeja Obradovića 3 Novi Sad Serbia CERN Esplanade des Particules 1 Geneva Switzerland DPNC Section de Physique Université de Genève 24 Quai Ernest-Ansermet Geneva Switzerland STFC Daresbury Laboratory Keckwick Ln Daresbury Cheshire United Kingdom STFC Rutherford Appleton Laboratory Harwell Campus Didcot United Kingdom School of Physics and Astronomy Kelvin Building University of Glasgow Glasgow United Kingdom Department of Physics University of Liverpool Oxford St Liverpool United Kingdom Department of Physics Blackett Laboratory Imperial College London Exhibition Road London United Kingdom Department of Physics University of Oxford Denys Wilkinson Building Keble Rd Oxford United Kingdom Department of Physics and Astronomy University of Sheff

Multiple Coulomb scattering (MCS) is a well-known phenomenon occurring when charged particles traverse materials. Measurements of muons traversing low Z materials made in the MuScat experiment showed that theoretical models and simulation codes, such as geant4 (v7.0), over-estimated the scattering. The Muon Ionization Cooling Experiment (MICE) measured the cooling of a muon beam traversing a liquid hydrogen or lithium hydride (LiH) energy absorber as part of a programme to develop muon accelerator facilities, such as a neutrino factory or a muon collider. The energy loss and MCS that occur in the absorber material are competing effects that alter the performance of the cooling channel. Therefore measurements of MCS are required in order to validate the simulations used to predict the cooling performance in future accelerator facilities. We report measurements made in the MICE apparatus of MCS using a LiH absorber and muons within the momentum range 160 to 245 MeV/c. The measured RMS scattering width is about 9% smaller than that predicted by the approximate formula proposed by the Particle Data Group, but within the latter’s stated uncertainty. Data at 172, 200 and 240 MeV/c are compared to the geant4 (v9.6) default scattering model. These measurements show agreement with this more recent geant4 (v9.6) version over the range of incident muon momenta.

关键词： Beam code development & simulation techniques Beam optics transport Lattices in beam optics Polarization in interactions & scattering Single-particle dynamics Muons Neutrinos

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Toward a fractal spectrum approach for neutron and gamma pulse shape discrimination

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Chinese Physics C 2016年第6期40卷 67-73页

作者：刘明哲刘炳琦左卓王磊昝贵彬庹先国 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology) Chengdu 610059China College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China

Accurately selecting neutron signals and discriminating γsignals from a mixed radiation field is a key research issue in neutron detection. This paper proposes a fractal spectrum discrimination approach by means of different spectral characteristics of neutrons and γ rays. Figure of merit and average discriminant error ratio are used together to evaluate the discrimination effects. Different neutron and γ signals with various noise and pulse pile-up are simulated according to real data in the literature. The proposed approach is compared with the digital charge integration and pulse gradient methods. It is found that the fractal approach exhibits the best discrimination performance, followed by the digital charge integration method and the pulse gradient method, respectively. The fractal spectrum approach is not sensitive to high frequency noise and pulse pile-up. This means that the proposed approach has superior performance for effective and efficient anti-noise and high discrimination in neutron detection.

关键词： neutron γactal spectrum

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