作者机构:
[李玥航; 于涛; 陈珍平] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[甘斌; 鲜希睿; 牛昊轩] Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu;610213, China;Hunan Provincial Digital Reactor Engineering Technology Research Center, Hengyang
通讯机构:
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构:
[李琼; 刘紫静; 王维嘉; 赵鹏程; 于涛; 常浩彤] School of Nuclear Science and Technology, University of South China, Hunan, Hengyang;421001, China;Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hunan, Hengyang;[李琼; 刘紫静; 赵鹏程; 于涛] 421001, China<&wdkj&>Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hunan, Hengyang;[李琼; 刘紫静; 王维嘉; 赵鹏程; 于涛; 常浩彤] 421001, China
作者:
Ji, Xuan-Tao;Luo, Si-Yuan;Huang, Yu-He;Zhu, Kun;Zhu, Jin;...
期刊:
核技术(英文版),2022年33(1):13-23 ISSN:1001-8042
通讯作者:
Wang, Xiao-Dong
作者机构:
[Zhu, Jin; Peng, Xiao-Yu; Huang, Yu-He; Wang, Xiao-Dong; Ji, Xuan-Tao; Xiao, Min; Zhu, Kun; Luo, Si-Yuan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构:
[Wang, Xiao-Dong] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词:
Image reconstruction;Monte Carlo simulation;Non-destructive detection
摘要:
The muon radiography imaging technique for high-atomic-number objects(Z) and large-volume objects via muon transmission imaging and muon multiple scattering imaging remains a popular topic in the field of radiation detection imaging. However, few imaging studies have been reported on low and medium Z objects at the centimeter scale. This paper presents an imaging system that consists of three layers of a position-sensitive detector and four plastic scintillation detectors. It acquires data by coincidence detection technique of cosmic-ray muon and its secondary particles. A 3 D imaging algorithm based on the density of the coinciding muon trajectory was developed, and 4D imaging that takes the atomic number dimension into account by considering the secondary particle ratio information was achieved. The resultant reconstructed 3 D images could distinguish between a series of cubes with 5-mm-side lengths and 2-mm-intervals. If the imaging time is more than 20 days, this method can distinguish intervals with a width of 1 mm. The 4D images can specify target objects with low, medium, and high Z values.
作者:
Li Chun-Yu;Hao Guang-Zhou;Liu Yue-Qiang;Wang Lian;Liu Yi-Hui-Zi
期刊:
物理学报,2022年71(7):256-264 ISSN:1000-3290
作者机构:
[Hao Guang-Zhou; Li Chun-Yu; Wang Lian] Southwestern Inst Phys, Chengdu 610041, Peoples R China.;[Liu Yue-Qiang] Gen Atom, San Diego, CA 92186 USA.;[Liu Yi-Hui-Zi] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
作者机构:
Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing, China;State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Beijing, China;School of Physical Science, University of Chinese Academy of Sciences, Beijing, China;[Xin Ling] School of Nuclear Science and Technology, University of South China, Hengyang, China;[Yuanxue Gao; Zhihang Zhu] Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing, China<&wdkj&>State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Beijing, China<&wdkj&>School of Physical Science, University of Chinese Academy of Sciences, Beijing, China
通讯机构:
[Xin Ling] S;School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词:
general framework;photofission observables;mass yield distributions;isobaric charge distributions;prompt neutron and gamma rays
摘要:
A reasonable prediction of photofission observables plays a paramount role in understanding the photofission process and guiding various photofission-induced applications, such as short-lived isotope production, nuclear waste disposal, and nuclear safeguards. However, the available experimental data for photofission observables are limited, and the existing models and programs have mainly been developed for neutron-induced fission processes. In this study, a general framework is proposed for characterizing the photofission observables of actinides, including the mass yield distributions (MYD) and isobaric charge distributions (ICD) of fission fragments and the multiplicity and energy distributions of prompt neutrons (n(p) ) and prompt gamma rays (gamma(p)). The framework encompasses various systematic neutron models and empirical models considering the Bohr hypothesis and does not rely on the experimental data as input. These models are then validated individually against experimental data at an average excitation energy below 30 MeV, which shows the reliability and robustness of the general framework. Finally, we employ this framework to predict the characteristics of photofission fragments and the emissions of prompt particles for typical actinides including Th-232, U-235,U- 238 and Pu-240. It is found that the U-238(gamma, f) reaction is more suitable for producing neutron-rich nuclei compared to the Th-232(gamma, f) reaction. In addition, the average multiplicity number of both n(p) and gamma(p) increases with the average excitation energy.
作者机构:
[Zhu, De-Xing; Li, Xiao-Hua; Xu, Yang-Yang; Liu, Hong-Ming; Zou, You-Tian] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Tech Collaborat Nuc, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chu, Peng-Cheng] Qingdao Technol Univ, Sch Sci, Inst Theoret Phys, Qingdao 266000, Peoples R China.
关键词:
two-proton radioactivity;Coulomb and proximity potential model;half-life
摘要:
Considering the preformation probability of the two emitted protons in the parent nucleus, we extend the Coulomb and proximity potential model (CPPM) to systematically study two-proton (2p) radioactivity half-lives of the nuclei close to proton drip line. The proximity potential chosen is Prox. 81 proposed by Blocki et al. in 1981. Furthermore, we apply this model to predict the half-lives of possible 2p radioactive candidates whose 2p radioactivity is energetically allowed or observed but not yet quantified in the evaluated nuclear properties table NUBASE2016. The predicted results are in good agreement with those from other theoretical models and empirical formulas, namely the effective liquid drop model (ELDM), generalized liquid drop model (GLDM), Gamow-like model, Sreeja formula and Liu formula.
作者机构:
[王天石; 王宇轩; 赵鹏程; 王曦婕; 凌煜凡; 王雨晴; 朱恩平] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu;610213, China;[王天石; 王宇轩; 王曦婕; 凌煜凡; 王雨晴; 朱恩平] 421001, China
通讯机构:
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构:
[胡杨; 刘依诺; Zeng, Wenjie; 梁乐华; 李楚豪] School of Nuclear Science and Technology, University of South China, Hunan, Hengyang;421001, China;[胡杨; 刘依诺; Zeng, Wenjie; 梁乐华; 李楚豪] 421001, China
作者机构:
[邱小平; 贺灿; 陈珍平; 赵鹏程] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[孙征; 邵静] China Institute of Atomic Energy, Beijing, 102413, China
通讯机构:
[Qiu, X.] S;School of Nuclear Science and Technology, China
作者机构:
[Zhu, De-Xing; Li, Xiao-Hua; Xu, Yang-Yang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Hong-Ming] Fudan Univ, Inst Modern Phys, Shanghai 200433, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Tech Collaborat Nuc, Hengyang 421001, Peoples R China.
通讯机构:
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>National Exemplary Base for International Sci & Tech. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, Hengyang, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha, China
关键词:
2p radioactivity;Gamow-like model;Half-life;Excited state
摘要:
In this study, we systematically investigated the two-proton (
$$\text {2p}$$
) radioactivity half-lives from the excited state of nuclei near the proton drip line within the Gamow-like model (GLM) and modified Gamow-like model (MGLM). The calculated results were highly consistent with the theoretical values obtained using the unified fission model [Chin. Phys. C
$${\textbf {45}}$$
, 124105 (2021)], effective liquid drop model, and generalized liquid drop model [Acta Phys. Sin
$${\textbf {71}}$$
, 062301 (2022)]. Furthermore, utilizing the GLM and MGLM, we predicted the
$$\text {2p}$$
radioactivity half-lives from the excited state for some nuclei that are not yet available experimentally. Simultaneously, by analyzing the calculated results from these theoretical models, it was found that the half-lives are strongly dependent on
$$Q_\text {2p}$$
and
$$\ell $$
.