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Attempt to synthesize the proton-unbound Bi182,183 isotopes

Physical Review C 2024年第1期110卷 014326-014326页

作者： H. Huang H. Y. Wu C. Y. Guo W. Q. Zhang Q. B. Zeng D. X. Wang Z. Liu Z. H. Li A. N. Andreyev S. Antalic B. Andel A. Sitarčík H. Hua X. H. Yu Z. X. Zhou X. Wang H. Y. Lu Z. G. Gan Z. Y. Zhang L. Ma M. H. Huang H. B. Yang M. M. Zhang X. J. Wen G. S. Li F. F. Zeng X. X. Xu J. J. Liu H. Jian H. F. Zhu Q. R. Gao Z. Qin J. R. Wang Z. M. Jia S. W. Cao P. F. Zhai Y. J. Li X. H. Zhou F. S. Zhang Beijing 100049 China D-64291 Darmstadt Germany Key Laboratory of Nuclear Data School of Physics and School of Physics Engineering and Technology Advanced Science Research Center (ASRC) Department of Nuclear Physics and Biophysics School of Space Science and Physics The Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and Technology Institute of Radiation Technology

The near-symmetric complete fusion reaction Kr78+Ag107→Bi*185 was studied at the gas-filled recoil separator SHANS with an attempt to synthesize the extremely neutron-deficient proton-unbound Bi182,183 isotopes. No decay events which could be attributed to them were observed. The two- and three-particle evaporation residues Hg180,179 (αp, αpn) and Pb183,182 (pn, p2n) were identified. Their production cross sections have been measured at two bombarding energies. Based on the yields of Pb182,183 in the present work and the systematics of the ratios between the cross sections of p(x−1)n and xn evaporation channels for the most neutron-deficient odd-Z nuclei above lead, the upper limits for the half-lives of Bi182,183 were estimated to be less than 0.3µs.

关键词： Lifetimes & widths Low & intermediate energy heavy-ion reactions nuclear structure & decays 150 ≤ A ≤ 189

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Simulation of Fast Neutron Radiography with a Time-of-Flight System

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Physics Procedia 2015年 69卷 284-291页

作者： D. Chen J. Bao Q. Zhang S. Han J. Ren Y. Nie X. Ruan L. Hou Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing China 102413 Neutron Scattering Laboratory China Institute of Atomic Energy Beijing China 102413

A novel fast neutron imaging method with Time-of-Flight was analyzed, which can provide a way to improve ratio of signal to noise for discrimination of scattered particles from the background, especially for bulky sample examination. For the same system spatial resolution, the length of each unit in scintillator detector array can be increased to improve detection efficiency, which is higher than for the traditional neutron image plate obviously. Key parameters such as detection efficiency and spatial resolution have been simulated by means of a Monte-Carlo method, and the ratio of signal to noise effect was estimated from MC and experimental results. Spatial resolution and contrast of compound sample have been calculated.

关键词： Fast neutron radiography Time-of-Flight Scintillator detector array Monte-Carlo method SNR

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Octupole bands and simplex inversion in the neutron-rich nucleus Ba145

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Physical Review C 2015年第1期91卷 014317-014317页

作者： Yong-Jing Chen (陈永静) Zao-Chun Gao (高早春) Yong-Shou Chen (陈永寿) Ya Tu (图雅) Key Laboratory of Science and Technology on Nuclear Data China Institute of Atomic Energy Beijing 102413 China College of Physics Science and Technology Shenyang Normal University ShenYang 110034 China

The issue of the existence of reflection asymmetry in Ba145 has stood for the past 30 years without a common conclusion. The recent experimental data show a number of low-lying rotational bands with alternative parities, providing more strict constraints on the relevant modeling. With a proper octupole deformation, all the observed six rotational bands in Ba145 have been well reproduced by the reflection asymmetric shell model (RASM). The three octupole deformed neutron single-particle orbitals just above the octupole shell gap 88, with K=1/2,K=3/2, and K=5/2, respectively, dominate the intrinsic configurations of the observed bands. Based on the analysis of the calculated RASM wave functions, the assignments for the observed bands have been given. The experimental yrast band (ΔI=1) presents a simplex inversion at around the 11/2− state where the simplex staggering phase changes. This phenomenon may be explained in the framework of the RASM as from the change of the dominate intrinsic configuration, induced by the band mixing. The present results strongly support the appearance of the reflection asymmetry in the ground and low-lying states of Ba145.

关键词： nuclear rotational states nuclear shell theory nuclear structure NEUTRONS ELECTRON spin states

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The C_(6)D_(6)detector system on the Back-n beam line of CSNS

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Radiation Detection technology and Methods 2019年第3期3卷 274-282页

作者： Jie Ren Xichao Ruan Jie Bao Guangyuan Luan Wei Jiang Qi An Huaiyong Bai Ping Cao Qiping Chen Yonghao Chen Pinjing Cheng Zengqi Cui Ruirui Fan Changqing Feng Minhao Gu Fengqin Guo Changcai Han Zijie Han Guozhu He Yongcheng He Yuefeng He Hanxiong Huang Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Haoyu Jiang Hantao Jing Ling Kang Mingtao Kang Bo Li Lun Li Qiang Li Xiao Li Yang Li Yang Li Rong Liu Shubin Liu Xingyan Liu Yinglin Ma Changjun Ning Binbin Qi Zhaohui Song Hong Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing Tang Jingyu Tang Pengcheng Wang Qi Wang Taofeng Wang Yanfeng Wang Zhaohui Wang Zheng Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Han Yi Li Yu Tao Yu Yongji Yu Guohui Zhang Jing Zhang Linhao Zhang Liying Zhang Qingmin Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yingtan Zhao Liang Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Dongguan Neutron Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics HefeiChina Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China University of South China Hengyang 421001China Northwest Institute of Nuclear Technology Xi’an 710024China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China Xi’an Jiaotong University Xi’an 710049China Beihang University Beijing 100083China

Introduction The neutron capture cross sections are very important in the field of nuclear device design and basic physics ***-free liquid scintillator such as C_(6)D_(6)detectors are widely used in the neutron capture cross-sectional measurements for the low neutron sensitivity and fast time *** Back-n white neutron source at China Spallation Neutron Source is the first spallation white neutron source in China,and it is suitable for neutron capture cross-sectional *** and methods A C_(6)D_(6)detector system was built in the Back-n experimental *** pulse height weighting technique was used to determine the system’s detection *** response to gamma rays of the C_(6)D_(6)detector was measured,and the energy resolution function was *** Carlo simulation with Geant4 code was carried out to get the weighting function of this C_(6)D_(6)detector ***,the systematic uncertainty of the weighting function was also *** According to the experimental and simulation results,this C_(6)D_(6)detector system can be used to measure neutron capture cross section.

关键词： C6D6 detector PHWT Neutron capture cross section White neutron source

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Examination of decay heat measurements and their relevance for understanding the origin of the reactor antineutrino anomaly

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Physical Review C 2023年第2期108卷 024617-024617页

作者： A. A. Sonzogni R. J. Lorek A. Mattera E. A. McCutchan Nuclear Science & Technology Department Brookhaven National Laboratory Upton New York 11973-5000 USA National Nuclear Data Center Brookhaven National Laboratory Upton New York 11973-5000 USA

Measurements of the decay energy released as a function of time following the thermal neutron induced fission of U235 and Pu239,241 were performed in the 1970s at Oak Ridge National laboratory with the purpose of quantifying possible loss of coolant accident scenarios. The derivative of this decay energy with respect to time, known in technical parlance as decay heat, is mainly composed of two terms, that of the electrons produced together with antineutrinos in the β-minus decay of the neutron-rich fission products, and that of the γ rays produced in the subsequent decay of excited nuclear levels. In this work we study if this extensive set of decay energy measurements can be used to assess the reactor antineutrino anomaly, that is, the approximately 5% deficit of electron antineutrinos produced by nuclear reactors, first deduced by Mention and collaborators in 2011, and observed by the major reactor antineutrino experiments since. With the assistance of nuclear databases, we are able to obtain the ratio of electron spectra under equilibrium conditions for U235 to Pu239, in better agreement with the lower trend recently reported by Kopeikin and collaborators, as well as those for U235 to Pu241 and Pu241 to Pu239, which do not agree well with those measured at the Institut Laue-Langevin in the 1980s. We conclude that a new experimental campaign is needed to measure the electron spectra utilizing a high resolution and signal-to-noise-ratio electron spectrometer and a highly precise fission normalization procedure.

关键词： Electroweak interactions in nuclear physics Fission nuclear reactors nuclear structure & decays Neutrinos

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Sequential deprotonation of the allene trication produced by 30-keV/u He2+ impact

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Physical Review A 2022年第2期105卷 022818-022818页

作者： Zhencen He Jiarong Wang Yu Zhang Bo Wang Jie Han Baihui Ren Long Wei Zihan Xia Pufang Ma Tianming Meng Yaming Zou Zhimin Hu Baoren Wei Institute of Modern Physics Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE) Fudan University Shanghai 200433 China College of Data Science Jiaxing University Jiaxing 314001 China Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu 610064 China

The three-body fragmentation channel H++H++C3H2+ of the allene trication produced by 30-keV/u He2+ ion impact is investigated using cold-target recoil-ion momentum spectroscopy. The two protons with different kinetic energies are found emitted sequentially from the parent trication. The presence of such a sequential deprotonation process and the absence of corresponding concerted deprotonation may result from a major molecular deformation process, e.g., ultrafast hydrogen migration, which occurs in the parent ion prior to fragmentation, and finally leads to the formation of two different protons.

关键词： Atomic & molecular collisions

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Revealing the Defect-Dominated Electron Scattering in Mg_(3)Sb_(2)-Based Thermoelectric Materials

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Research 2023年第1期2022卷 379-388页

作者： Jucai Jia Yan Zhou Xiaoxi Chen Wenhua Xue Hulei Yu Jing Li Shizhen Zhi Chen Chen Jian Wang Shuaihang Hou Xingjun Liu Yumei Wang Feng Cao Yue Chen Jun Mao Qian Zhang School of Materials Science and Engineering and Institute of Materials Genome Big DataHarbin Institute of Technology(Shenzhen)Shenzhen 518055China Center for Device Thermography and Reliability(CDTR) H.H.Wills Physics LaboratoryUniversity of BristolTyndall AvenueBristol BS81TLUK Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences100190BeijingChina 'Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong Kong SARChina School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The thermoelectric parameters are essentially governed by electron and phonon *** the carrier scattering mechanism plays a decisive role in electron transport,it is of great significance for the electrical properties of thermoelectric *** a typical example,the defect-dominated carrier scattering mechanism can significantly impact the room-temperature electron mobility of n-type Mg_(3)Sb_(2)-based ***,the origin of such a defect scattering mechanism is still ***,the existence of the Mg vacancies and Mg interstitials has been identified by synchrotron powder X-ray *** relationship among the point defects,chemical compositions,and synthesis conditions in Mg_(3)Sb_(2)-based materials has been *** further introducing the point defects without affecting the grain size via neutron irradiation,the thermally activated electrical conductivity can be *** results demonstrate that the point defects scattering of electrons is important in the n-type Mg_(3)Sb_(2)-based materials.

关键词： materials defect Electron

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Security Compressed Sensing Image Encryption Algorithm Based on Elliptic Curve 9th

Security Compressed Sensing Image Encryption Algorithm Based...

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9th International Conference of Pioneering Computer Scientists, Engineers and Educators, ICPCSEE 2023

作者： Jin, Anan Li, Xiang Xiong, Qingzhi School of Information Engineering East China University of Technology Jiangxi Nanchang330013 China Jiangxi Engineering Technology Research Center of Nuclear Geoscience Data Science and System East China University of Technology Jiangxi Nanchang330013 China Jiangxi Key Laboratory of Cybersecurity Intelligent Perception East China University of Technology Jiangxi Nanchang330013 China

ISBN: (纸本)9789819959679

Aiming to address the problems of high costs associated with the storage and transmission of environmental monitoring images, as well as potential security risks, this paper proposes a security compressed sensing image encryption algorithm based on elliptic curve cryptography. The algorithm introduces elliptic curve encryption technology within a compressed sensing framework, using elliptic curve cryptography to encrypt the matrix during the compression perception acquisition process. This enables secure acquisition of environmental monitoring encrypted images. Therefore, this paper presents a security compressed sensing framework to address security gaps in the compression perception reconstruction process and improve the security of environmental monitoring images. Experimental results show that the proposed algorithm effectively encrypts and reconstructs environmental monitoring images, with high security and resistance to cracking. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Compressed sensing

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Indirect influence in social networks as an induced percolation phenomenon (vol 119, e2100151119, 2022)

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PROCEEDINGS OF THE NATIONAL ACADEMY OF scienceS OF THE UNITED STATES OF AMERICA 2022年第24期119卷 e2100151119-e2100151119页

作者： Xie, Jiarong Wang, Xiangrong Feng, Ling Zhao, Jin-Hua Liu, Wenyuan Moreno, Yamir Hu, Yanqing School of Computer Science and Engineering Sun Yat-sen University 510006 Guangzhou China Institute of Future Networks Southern University of Science and Technology 518055 Shenzhen China Peng Cheng Laboratory 518066 Shenzhen China Institute of High Performance Computing A*STAR 138632 Singapore Department of Physics National University of Singapore 117551 Singapore Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University 510006 Guangzhou China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University 510006 Guangzhou China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Institute for Biocomputation and Physics of Complex Systems University of Zaragoza 50018 Zaragoza Spain Department of Theoretical Physics University of Zaragoza 50018 Zaragoza Spain ISI Foundation 10126 Torino Italy Department of Statistics and Data Science College of Science Southern University of Science and Technology 518055 Shenzhen China

Percolation theory has been widely used to study phase transitions in network systems. It has also successfully explained various macroscopic spreading phenomena across different fields. Yet, the theoretical frameworks have been focusing on direct interactions among nodes, while recent empirical observations have shown that indirect interactions are common in many network systems like social and ecological networks, among others. By investigating the detailed mechanism of both direct and indirect influence on scientific collaboration networks, here we show that indirect influence can play the dominant role in behavioral influence. To address the lack of theoretical understanding of such indirect influence on the macroscopic behavior of the system, we propose a percolation mechanism of indirect interactions called induced percolation. Surprisingly, our model exhibits a unique anisotropy property. Specifically, directed networks show first-order abrupt transitions as opposed to the second-order continuous transition in the same network structure but with undirected links. A mix of directed and undirected links leads to rich hybrid phase transitions. Furthermore, a unique feature of the nonmonotonic pattern is observed in network connectivities near the critical point. We also present an analytical framework to characterize the proposed induced percolation, paving the way to further understanding network dynamics with indirect interactions.

关键词： percolation indirect interactions social network phase transition behavioral contagion

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Detector development at the Back-n white neutron source

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Radiation Detection technology and Methods 2023年第2期7卷 171-191页

作者： Fan Ruirui Li Qiang Bao Jie Li Yang Liu Rong Jiang Wei Ren Jie Zhang Qiwei Cao Ping Gu Minhao Ren Zhizhou Yi Han Tang Jingyu An Qi Bai Haofan Bai Jiangbo Chen Qiping Chen Yonghao Chen Zhen Cui Zengqi Fan Anchuan Feng Changqing Feng Fanzhen Gao Keqing Han Changcai Han Zijie He Guozhu He Yongcheng Hong Yang Hu Yiwei Huang Hanxiong Jia Weihua Jiang Haoyu Jiang Zhijie Jin Zhengyao Kang Ling Li Bo Li Chao Li Gong Li Jiawen Li Xiao Liu Jie Liu Shubin Luan Guangyuan Ning Changjun Qi Binbin Ruan Xichao Song Zhaohui Sun Kang Tan Zhixin Tang Shengda Wang Pengcheng Wang Zhaohui Wen Zhongwei Wu Xiaoguang Wu Xuan Xie Likun Yang Yiwei Yu Yongji Zhang Guohui Zhang Linhao Zhang Mohan Zhang Xianpeng Zhang Yuliang Zhang Yue Zhang Zhiyong Zhao Maoyuan Zhou Luping Zhou Zhihao Zhu Kejun The CSNS Back-n Collaboration Institute of High Energy Physics CASBeijing 100049People’s Republic of China Spallation Neutron Source Science Center Dongguan 523803People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049People’s Republic of China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413People’s Republic of China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900People’s Republic of China Department of Modern Physics University of Science and Technology of ChinaHefei 230026People’s Republic of China State Key Laboratory of Particle Detection and Electronics Hefei 230026People’s Republic of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026People’s Republic of China Northwest Institute of Nuclear Technology Xi’an 710024People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China 不详

Purpose Back-n is a white neutron beamline at China spallation neutron source,which was established in the year of *** is a powerful facility for nuclear data measurement,neutron detector calibration,and radiation effect *** A series of detectors were built for different experiments,including beam monitoring,beam profile measurement,neutron induced secondaries(fission fragments,light charged particles and gamma)cross section measurement,and neutron resonance radiography,etc.A common digitization electronics and a cluster-based DAQ were developed for these detector *** detectors have been employed at Back-n and serviced for experiments from the beginning of the beamline *** and conclusion As an overview of detectors of Back-n,the details of the detector design and the experiment performing are described in this *** developing systems,e.g.,MTPC and B-MCP,are also included.

关键词： White neutron source Beam diagnostics Fission fragment Charged particle Gamma Neutron resonance radiography

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