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Measurement of Total Cross Sections at Pohang Neutron Facility

AIP Conference Proceedings 2005年第1期769卷 740-743页

作者： Guinyun Kim A. K. M. M. H. Meaze Hossain Ahmed Dongchul Son Young Seok Lee Hengsik Kang Moo‐Hyun Cho In Soo Ko Won Namkung Tae‐Ik. Ro Won‐Chung Chung Young Ae Kim Kun Joong Yoo Jong Hwa Chang 1Department of Physics Kyungpook National University Daegu 702‐701 Korea 2Pohang Accelerator Laboratory Pohang University of Science and Technology Pohang 790 ‐ 784 Korea 3Department of Physics Dong‐A University Busan 604‐714 Korea 4Nuclear Data Evaluation Laboratory Korea Atomic Energy Research Institute Daejeon 305‐600 Korea

The Pohang Neutron Facility, which consists of an electron linear accelerator, a water‐cooled Ta target with a water moderator, and a time‐of‐flight path with an 11 m length has been operated since 2000. We report the status activities on the neutron total cross‐section measurements in the neutron energy region from 0.01 eV to 100 eV by the neutron time‐of‐flight method at Pohang Neutron Facility. A 6Li‐ZnS(Ag) scintillator with a diameter of 12.5 cm and a thickness of 1.5 cm has been used as a neutron detector. The background level has been determined by using notch‐filters of Co, In, and Cd sheets. In order to reduce the gamma rays from Bremsstrahlung and that from neutron capture, we have employed a neutron‐gamma separation system based on their different pulse shape. The present measurements for Ag, Hf, and Ta samples are compared with the previous ones and the evaluated data in ENDF/B‐VI. The resonance parameters for Ag and Hf samples have been extracted from the transmission data by using the SAMMY code.

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Measurement of E1 and E2 cross sections of 12C(α,γ)16O using pulsed α beams

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AIP Conference Proceedings 2009年第1期1120卷 284-288页

作者： H. Makii Y. Nagai K. Mishima M. Segawa T. Shima H. Ueda M. Igashira aInstitute for nuclear and particle physics High Energy Accelerator Research Organization Tsukuba Ibaraki 305‐0801 Japan bDivision of Nuclear Data and Reactor Engineering Japan Atomic Energy Agency Tokai Ibaraki 319‐1195 Japan cResearch Center for Nuclear Physics Osaka University Ibaraki Osaka 567‐0047 Japan dInstitute of Materials Structure Science High Energy Accelerator Research Organization Tsukuba Ibaraki 305‐0801 Japan eQuantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319‐1195 Japan fResearch Laboratory for Nuclear Reactors Tokyo Institute of Technology Meguro Tokyo 152‐8550 Japan

We have measured the γ‐ray angular distribution of the 12C(α,γ)16O reaction at a center‐of‐mass energy of Ecm = 1.6 MeV and Ecm = 1.4 MeV. In this experiment, we used high efficiency anti‐Compton NaI(Tl) spectrometers to detect a γ‐ray from the reaction with a large S/N ratio, intense pulsed α beams to discriminate true events from neutron induced background by using a time‐of‐flight (TOF) method, and the monitoring system of target thickness. We could pick up true events from the reaction free from intense neutron background with high statistics.

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Role of multiparticle-multihole states of O18,19 in O18(n,γ)O19 reactions at keV energy

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Physical Review C 2008年第5期77卷 051303(R)-051303(R)页

作者： T. Ohsaki M. Igashira Y. Nagai M. Segawa K. Muto Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1 O-okayama Meguro Toyo 152-8550 Japan Research Center for Nuclear Physics Osaka University Ibaraki Osaka 667-0047 Japan Division of Nuclear Data and Reactor Engineering Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Quantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Department of Physics Tokyo Institute of Technology 2-12-1 O-okayama Meguro Tokyo 152-8551 Japan

We have determined for the first time the partial-capture cross sections for discrete γ rays from neutron capture by O18 to the 5/2+ground, 1/2+second, and 3/2+ first excited states in O19 at 10⩽En⩽80 keV. The first two cross sections agree with the calculated ones based on a nonresonant direct p-wave capture by O18 within a factor of two. On the other hand, the cross section to the 3/2+ state with a three-particle (d5/2)3configuration was found to be about 180 times larger than the calculated one. We discussed a possible origin of the large discrepancy by referring to recent results of O18(n,γ)O19 at thermal energy.

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Axial shape asymmetry and high-spin states in nuclei with Z=100 suggested by the projected total energy surface approach

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Physical Review C 2021年第1期104卷 014306-014306页

作者： Tu Ya (图雅) Yong-Jing Chen (陈永静) Yong-Shou Chen (陈永寿) Zao-Chun Gao (高早春) Ling Liu (刘玲) School of Physics Science and Technology Shenyang Normal University ShenYang 110034 China China Nuclear Data Center China Institute of Atomic Energy Beijing 102413 China China Institute of Atomic Energy Beijing 102413 China State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

The axial-shape asymmetry of yrast states in Fm246–256 is studied by performing the projected total-energy surface (PTES) calculations, which consider the beyond-mean-field effects associated with the restoration of rotational symmetry and shape variation at the same time. The results show a large elongation deformation but also a considerable large triaxiality for their ground and high spin states, the triaxial deformation γ≈11∘ in average. In comparison, the TRS calculations have also been performed for these nuclei, and the results show a well-established axial quadrupole shape in their ground states. The presence of the significant triaxial deformation can be attributed to the beyond-mean-field effects generated by the angular-momentum projection. The axial asymmetric shape for the yrast states of nuclei with Z=100, suggested by the present variation after projection (VAP) calculations, indicates that the triaxial degree of freedom may also play a significant role in other transfermium and even superheavy nuclei. The present PTES calculations have well reproduced the available experimental energies of the ground-band states and predict the rest yrast states up to spin 30 in each nucleus. The calculated yrast bands of Fm246–256 present the back bending phenomenon at about the state 18+, caused by the alignment excitations of the two quasiparticle neutrons of νj15/2[743]7/2 or of νh11/2[761]1/2. It is worth confirming the predicted band structures by the future spectroscopic experiments in the transfermium nuclei for the study of the single-particle structure in the superheavy mass region.

关键词： nuclear structure & decays Nucleon distribution A ≥ 220

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Role of multiparticle-multihole states in O18,19 in thermal neutron capture of O18

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Physical Review C 2007年第5期76卷 051301(R)-051301(R)页

作者： Y. Nagai M. Segawa T. Ohsaki H. Matsue K. Muto Research Center for Nuclear Physics Osaka University. Ibaraki Osaka 567-0047 Japan Division of Nuclear Data and Reactor Engineering Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Quantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1 O-okayama Meguro Tokyo 152-8550 Japan Department of Physics Tokyo Institute of Technology 2-12-1 O-okayama Meguro Tokyo 152-8551 Japan

The primary E1γ-ray transition strength from the thermal neutron capture of O18 to the 3/2− state, 18 keV below the neutron threshold of O19, was found to be about 2×105 stronger than that to the 1/2− excited state, 729 keV below the threshold. In addition, the E1 strength from the 3/2− state leading to the 3/2+ state with three (d5/2)3 neutrons was more than six times stronger compared to that to the 5/2+ ground state with a single (d5/2) neutron. These anomalous γ-ray decay patterns give the first clear experimental evidence for the predicted property of the 3/2− state as mainly having a one-hole-four-particle configuration. Unique features of the O18 ground state with a two-hole-four-particle configuration and of the 3/2+ state combined with a discrete prompt γ-ray spectroscopy following the thermal neutron capture of O18 enabled us to exclusively identify the configuration of the 3/2− state.

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Measurement of the neutron capture cross sections of rhenium up to stellar s- and r-process temperatures at the China Spallation Neutron Source Back-n facility

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Physical Review Research 2024年第1期6卷 013225-013225页

作者： Gaole Yang Zhendong An Wei Jiang Xiankai Li Weiwei Qiu Zhengfa Liao Ziyue Zhuang Xiaoping Zhang Shengli Chen Chenchen Guo Erxi Xiao Xiao Fang Xinxiang Li Hongwei Wang Xinrong Hu Bing Jiang Wenqing Shen Jincheng Wang Jie Ren Xichao Ruan Dexin Wang Su-Yalatu Zhang Wen Luo Zhichao Zhu Haoyang Lan Zongwei Cao Xu Ma Yingdu Liu Pusen Wang Yi Yang Ping Su Xiangai Deng Wanbing He Yugang Ma Chunwang Ma Yuting Wang Zhitao Dai Ertao Li Pengqin He RenGuang Tang Tao Zhou Jing Wang Han Yi Yue Zhang Yonghao Chen Ruirui Fan Keqing Gao Qiang Li Kang Sun Zhixin Tan Minhao Gu Hantao Jing Jingyu Tang Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China School of Physics and Astronomy Sun Yat-sen University Zhuhai 519082 China State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Macau 999078 China CNSA Macau Center for Space Exploration and Science Macau 999078 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Spallation Neutron Source Science Center Dongguan 523803 China School of Nuclear Science and Technology University of South China Hengyang 421001 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai 519082 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China Key Laboratory of Nuclear Data China Institute of Atomic Energy Beijing 102413 China College of Mathematics and Physics Inner Mongolia Minzu University Tongliao 028000China Institute of Nuclear Physics Inner Mongolia Minzu University Tongliao 028000 China Shool of Materials Science and Engineering Xiangtan University Xiangtan 411100 China Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai 200433 China Institute of Particle and Nuclear Physics Henan Normal University Xinxiang 453007 China School of Physics Henan Normal University Xinxiang 453007 China Shenzhen Center Cancer hospital Chinese Academy of Medical Sciences Shenzhen 518100 China Institute for Advanced Study in Nuclear Energy and Safety College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China School of Nuclear Science and Technology University of Science and Technology of China Hefei 230027 China

The neutron capture measurement of natural rhenium was performed with the time-of-flight technique at the Back-n facility of the China Spallation Neutron Source in the energy range from 1 to 500 eV of the resolved resonance region (RRR) and from 5 to 400 keV in the unresolved resonance region (URR). Prompt γ-rays originating from neutron-induced capture events were detected by four C6D6 detectors. The pulse height weighting technique and the double-bunch unfolding method based on the Bayesian theory were used in the data analysis. To obtain reliable measurement results, background subtraction, normalization, and corrections were carefully considered. The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the RRR. An absence of resonance near 392 eV is observed in our measurement, which has been observed in previous works. The average cross sections in the URR of natural rhenium relative to Au197 were obtained in logarithmical equidistant energy bins with 20 bins per energy decade. The talys code was used to describe the average cross sections in the URR; the Maxwellian-averaged cross sections (MACSs) of Re185 and Re187 are given from kT=5 to 100 keV. At a thermal energy of kT=30 keV, the MACS value for Re185 (1469±127 mb) is in good agreement with the Karlsruhe Astrophysical database of Nucleosynthesis in Stars (KADoNIS) recommended value (1535±62 mb) within the error bars. By contrast, the value of 1361±118 mb for Re187 shows a discrepancy with the KADoNiS recommended value (1160±57 mb).

关键词： nuclear astrophysics nuclear reaction rates nuclear reactions Radiative capture Resonance reactions r process s process 150 ≤ A ≤ 189 nuclear data analysis & compilation

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Role of N∗(1535) in the Λ+c → K¯0ηp decay and the possible φp state in the Λ+c → π0φp decay 12

Role of N∗(1535) in the Λ+c → K¯0ηp decay and the possi...

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12th International Workshop on the Physiecs of Excited Nucleons, NSTAR 2019

作者： Xie, Ju-Jun Geng, Li-Sheng Guo, Feng-Kun Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China School of Physics and Microelectronics Zhengzhou University Henan Zhengzhou450001 China School of Physics Beijing Advanced Innovation Center for Big Data-based Precision Medicine Beihang University Beijing100191 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Zhong Guan Cun East Street 55 Beijing100190 China

The nonleptonic weak decays of Λ+c → K¯0ηp and Λ+c → π0φp are investigated from the viewpoint of probing the N∗(1535) resonance and the possible φp state. For the Λ+c → K¯0ηp decay, we study the invariant mass distribution of ηp with both the chiral unitary approach and an effective Lagrangian model. Within the chiral unitary approach, the N∗(1535) resonance is dynamically generated from the final state interaction of mesons and baryons in coupled channels. While for the effective Lagrangian model, we take a Breit-Wigner formula for the N∗(1535) resonance. We found that the behavior of the N∗(1535) resonance in the Λ+c → K¯0N∗(1535) → K¯0ηp decay within the two approaches is different. For the Λ+c → π0φp decay, we consider a triangle singularity mechanism, where the Λ+c decays into the K∗Σ∗(1385), the Σ∗(1385) decays into the π0Σ/Λ, and then the K∗Σ/Λ merge to produce the φp in the final state. This mechanism produces a peak structure around 2020 MeV. In addition, the possibility that there is a hidden-strange pentaquark-like state is also considered by taking into account the final state interactions of K∗Λ, K∗Σ, and φp. We conclude that it is difficult to search for the hidden-strange state in this decay. However, we do expect nontrivial behavior in the φp invariant mass distribution. The proposed Λ+c decay mechanism here can provide valuable information on the properties of these nuclear resonances and can in principle be tested by experiments such as BESIII, LHCb and Belle-II. © The Authors, published by EDP sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0.

关键词： Lagrange multipliers

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VG-Net: Sensor Time Series Anomaly Detection with Joint Variational Autoencoder and Graph Neural Network

VG-Net: Sensor Time Series Anomaly Detection with Joint Vari...

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Smart World Congress (SWC), IEEE

作者： Shuai Wang Shenghao Liu Xiaoxuan Fan Haijun Wang Yinxin Zhou Hanjun Gao Hongwei Lu Xianjun Deng Hubei Key Laboratory of Distributed System Security Hubei Engineering Research Center on Big Data Security School of Cyber Science and Engineering Huazhong University of Science and Technology Wuhan China Hunan Technical College of Railway High-speed China Nanjing University of Posts and Telecommunications China China National Nuclear Power Co Ltd China

ISBN: (数字)9798331520861

ISBN: (纸本)9798331520878

Intelligent Cyber-Physical Systems typically utilize sensors to gather a significant amount of raw data which often possesses temporal and high-dimensional characteristics. Ensuring the data reliability is crucial for the normal operation of the system. While most existing methods are capable of identifying anomalies in high-dimensional time series data from sensors, they often lack adequate accuracy and fail to adequately consider the correlation between sensor nodes. To address these limitations, we propose an unsupervised framework which is a combination of variational autoencoder and graph neural network(VG-Net). By jointly optimizing the reconstruction module and the prediction module, VG-Net effectively models the correlation between sensor nodes while simultaneously detecting anomalies. The reconstruction module is responsible for modeling the latent representation space and reconstructing the time series data through variational autoencoder. The prediction module leverages bidirectional long short term memory networks and neural tensor network to learn the relationships between sensor nodes, and uses graph neural network to predict the future behavior of the data. Experiments on eight real and synthetic datasets demonstrate that, compared with existing methods, VG-Net can accurately model the relationship between sensor nodes and enhance the anomaly detection performance of high-dimensional time series data.

关键词： Time series analysis Autoencoders Sensor phenomena and characterization Predictive models data models Graph neural networks Reliability Anomaly detection Intelligent sensors Synthetic data

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Measurement of the Pr141(n,γ) cross section up to stellar s-process temperatures at the China Spallation Neutron Source Back-n facility

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Physical Review C 2023年第3期108卷 035802-035802页

作者： Xiankai Li Zhendong An Wei Jiang Jingyi Zhang Ruoran Bai Shaokun Liu Xinxiang Li Zhichao Zhu Gaole Yang Weiwei Qiu Zhengfa Liao Ziyue Zhuang Xiaoping Zhang Shengli Chen Chenchen Guo Erxi Xiao Xiao Fang Hongwei Wang Xinrong Hu Bing Jiang Wenqing Shen Jincheng Wang Jie Ren Xichao Ruan Wen Luo Haoyang Lan Zongwei Cao Xu Ma Yingdu Liu Pusen Wang Yi Yang Ping Su Xiangai Deng Wanbing He Yugang Ma Chunwang Ma Yuting Wang Zhitao Dai Ertao Li Pengqin He RenGuang Tang Tao Zhou Jing Wang Han Yi Yue Zhang Yonghao Chen Ruirui Fan Keqing Gao Qiang Li Kang Sun Zhixin Tan Minhao Gu Hantao Jing Jingyu Tang School of Nuclear Science and Technology University of South China Hengyang 421001 China School of Physics and Astronomy Sun Yat-sen University Zhuhai 519082 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Macau 999078 China CNSA Macau Center for Space Exploration and Science Macau 999078 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Spallation Neutron Source Science Center Dongguan 523803 China University of Chinese Academy of Sciences Beijing 100049 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai 519082 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China Key Laboratory of Nuclear Data China Institute of Atomic Energy Beijing 102413 China State Key Laboratory of Nuclear Physics and Technology and CAPT Peking University Beijing 100871 China Beijing Laser Acceleration Innovation Center Huairou Beijing 101400 China Shool of Materials Science and Engineering Xiangtan University Xiangtan 411100 China Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai 200433 China Institute of Particle and Nuclear Physics Henan Normal University Xinxiang 453007 China School of Physics Henan Normal University Xinxiang 453007 China Shenzhen Center Cancer hospital Chinese Academy of Medical Sciences Shenzhen 518100 China Institute for Advanced Study in Nuclear Energy and Safety College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

In nuclear astrophysics, Pr141 is mainly produced by an s process, which has a neutron magic number (N=82) leading to its low capture cross section and strongly affecting the s process. Its neutron capture cross section is an important input parameter for nuclear astrophysical network calculations. According to the EXFOR database, the measurement precision for the Pr141(n,γ) cross section should be improved in the resolved and unresolved resonance region. The (n,γ) cross section of Pr141 was measured between 1 eV and 500 keV at the Back-n facility of the Chinese Spallation Neutron Source using the time-of-flight (TOF) method. The prompt γ rays were detected by four C6D6 liquid scintillator detectors, and the data was analyzed using the pulse-height weighting technique (PHWT). The majority of results are in agreement with the evaluated data libraries ENDF/B-VIII.0, JENDL-5.0, and TENDL-2021, with some significant exceptions for small resonances. The multilevel R-matrix Bayesian code sammy was used to extract the resonance parameters of Pr141 in the resolved resonance region. And the Maxwell average cross section (MACS) from kT=5 to 100 keV is calculated in the temperature range of the s-process nucleosynthesis model. In particular, at kT=30 keV the MACS value of Pr141 is 145.0±13.7 mb, which shows an obvious discrepancy with the Karlsruhe Astrophysical database of Nucleosynthesis in Stars (KADoNiS) recommended value 111.4±1.4 mb.

关键词： Neutron physics nuclear astrophysics nuclear reactions Nucleosynthesis in explosive environments Radiative capture Resonance reactions 90 ≤ A ≤ 149 nuclear data analysis & compilation Radiation detectors

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Tensor and Minimum Connected Dominating Set based Confident Information Coverage Reliability Evaluation for IoT

IEEE Transactions on Sustainable Computing

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IEEE Transactions on Sustainable Computing 2024年

作者： Xiao, Ziheng Zhu, Chenlu Feng, Wei Liu, Shenghao Deng, Xianjun Lu, Hongwei Yang, Laurence T. Park, Jong Hyuk Hubei Key Laboratory of Distributed System Security Hubei Engineering Research Center on Big Data Security School of Cyber Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Artificial Intelligence and Intelligent Transportation Joint Technical Center of HUST and Hubei Chutian Intelligent Transportation Company Ltd United States Network and Industrial Control Information Security Technology Department China Nuclear Power Operation Technology Company Ltd. 1011 Xiongchu Avenue Hubei Wuhan430070 China The Department of Computer Science and Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of

Internet of Things (IoT) reliability evaluation contributes to the sustainable computing and enhanced stability of the network. Previous algorithms usually evaluate the reliability of IoT by enumenating the states of nodes and networks, which are difficult to handle IoT with hundreds of nodes because the computational cost. In this paper, a novel algorithm, TMCRA, is proposed to evaluate the reliability of IoT in complex network environment, which consider both coverage and connectivity. For coverage, TMCRA employs the Confident Information Coverage (CIC) model to divide the target area into independent grids and calculates the coverage rate. In terms of connectivity, TMCRA forming the Virtual Backbone Network (VBN) based on two proposed methods: TMA and MGIN, and evaluate connectivity by analyzing the VBN rather than the whole network. The TMA and MGIN are two algorithms for constructing Minimum Connected Dominant Sets (MCDS), which are suitable for different scale networks. Finally, based on the data of coverage and connectivity, TMCRA utilizes tensors for the unified modeling and representation of network structure, and calculates IoT reliability based on the tensors. Simulations are carried out for various sizes of IoT to show the advantages and effectiveness of the proposed approach in reliability evaluation. © 2016 IEEE.

关键词： data reliability

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