Nuclear Science and Techniques最新文献_第9页

Reliable calculations of nuclear binding energies by the Gaussian process of machine learning 通过机器学习的高斯过程可靠计算核结合能

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-18 DOI: 10.1007/s41365-024-01463-9

Zi-Yi Yuan, Dong Bai, Zhen Wang, Zhong-Zhou Ren

{"title":"Reliable calculations of nuclear binding energies by the Gaussian process of machine learning","authors":"Zi-Yi Yuan, Dong Bai, Zhen Wang, Zhong-Zhou Ren","doi":"10.1007/s41365-024-01463-9","DOIUrl":"https://doi.org/10.1007/s41365-024-01463-9","url":null,"abstract":"Reliable calculations of nuclear binding energies are crucial for advancing the research of nuclear physics. Machine learning provides an innovative approach to exploring complex physical problems. In this study, the nuclear binding energies are modeled directly using a machine-learning method called the Gaussian process. First, the binding energies for 2238 nuclei with (Z > 20) and (N > 20) are calculated using the Gaussian process in a physically motivated feature space, yielding an average deviation of 0.046 MeV and a standard deviation of 0.066 MeV. The results show the good learning ability of the Gaussian process in the studies of binding energies. Then, the predictive power of the Gaussian process is studied by calculating the binding energies for 108 nuclei newly included in AME2020. The theoretical results are in good agreement with the experimental data, reflecting the good predictive power of the Gaussian process. Moreover, the (alpha)-decay energies for 1169 nuclei with (50 le Z le 110) are derived from the theoretical binding energies calculated using the Gaussian process. The average deviation and the standard deviation are, respectively, 0.047 MeV and 0.070 MeV. Noticeably, the calculated (alpha)-decay energies for the two new isotopes (^{204})Ac (Huang et al. Phys Lett B 834, 137484 (2022)) and (^{207})Th (Yang et al. Phys Rev C 105, L051302 (2022)) agree well with the latest experimental data. These results demonstrate that the Gaussian process is reliable for the calculations of nuclear binding energies. Finally, the (alpha)-decay properties of some unknown actinide nuclei are predicted using the Gaussian process. The predicted results can be useful guides for future research on binding energies and (alpha)-decay properties.","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":"102 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First-principles study on the diffusion behavior of Cs and I in Cr coating 铬涂层中铯和碘扩散行为的第一原理研究

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-18 DOI: 10.1007/s41365-024-01460-y

Shu-Ying Lin, Xiao-Jing Li, Lin-Bing Jiang, Xi-Jun Wu, Hui-Qin Yin, Yu Ma, Wen-Guan Liu

{"title":"First-principles study on the diffusion behavior of Cs and I in Cr coating","authors":"Shu-Ying Lin, Xiao-Jing Li, Lin-Bing Jiang, Xi-Jun Wu, Hui-Qin Yin, Yu Ma, Wen-Guan Liu","doi":"10.1007/s41365-024-01460-y","DOIUrl":"https://doi.org/10.1007/s41365-024-01460-y","url":null,"abstract":"Cs and I can migrate through fuel-cladding interfaces and accelerate the cladding corrosion process induced by the fuel-cladding chemical interaction. Cr coating has emerged as an important candidate for mitigating this chemical interaction. In this study, first-principles calculations were employed to investigate the diffusion behavior of Cs and I in the Cr bulk and grain boundaries to reveal the microscopic interaction mitigation mechanisms at the fuel-cladding interface. The interaction between these two fission products and the Cr coating were studied systematically, and the Cs and I temperature-dependent diffusion coefficients in Cr were obtained using Bocquet’s oversized solute-atom model and Le Claire’s nine-frequency model, respectively. The results showed that the Cs and I migration barriers were significantly lower than that of Cr, and the Cs and I diffusion coefficients were more than three orders of magnitude larger than the Cr self-diffusion coefficient within the temperature range of Generation-IV fast reactors (below 1000 K), demonstrating the strong penetration ability of Cs and I. Furthermore, Cs and I are more likely to diffuse along the grain boundary because of the generally low migration barriers, indicating that the grain boundary serves as a fast diffusion channel for Cs and I.","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":"41 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141532493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

One-neutron stripping process in the 209Bi(6Li, 5Li)210Bi* reaction reaction 209Bi(6Li, 5Li)210Bi* 反应中的单中子剥离过程

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-18 DOI: 10.1007/s41365-024-01462-w

Gao-Long Zhang, Zhen-Wei Jiao, Guang-Xin Zhang, E. N. Cardozo, B. Paes, Shi-Peng Hu, Jian-Qiang Qian, Daniele Mengoni, Wei-Wei Qu, Cong-Bo Li, Yun Zheng, Huan-Qiao Zhang, Hui-Bin Sun, Nan Wang, Chun-Lei Zhang, J. J. Valiente-Dobón, D. Testov, M. Mazzocco, A. Gozzelino, C. Parascandolo, D. Pierroutsakou, M. La Commara, A. Goasduff, D. Bazzacco, D. R. Napoli, F. Galtarossa, F. Recchia, A. Illana, S. Bakes, I. Zanon, S. Aydin, G. de Angelis, M. Siciliano, R. Menegazzo, S. M. Lenzi, S. Akkoyun, L. F. Canto, J. Lubian

{"title":"One-neutron stripping process in the 209Bi(6Li, 5Li)210Bi* reaction reaction","authors":"Gao-Long Zhang, Zhen-Wei Jiao, Guang-Xin Zhang, E. N. Cardozo, B. Paes, Shi-Peng Hu, Jian-Qiang Qian, Daniele Mengoni, Wei-Wei Qu, Cong-Bo Li, Yun Zheng, Huan-Qiao Zhang, Hui-Bin Sun, Nan Wang, Chun-Lei Zhang, J. J. Valiente-Dobón, D. Testov, M. Mazzocco, A. Gozzelino, C. Parascandolo, D. Pierroutsakou, M. La Commara, A. Goasduff, D. Bazzacco, D. R. Napoli, F. Galtarossa, F. Recchia, A. Illana, S. Bakes, I. Zanon, S. Aydin, G. de Angelis, M. Siciliano, R. Menegazzo, S. M. Lenzi, S. Akkoyun, L. F. Canto, J. Lubian","doi":"10.1007/s41365-024-01462-w","DOIUrl":"https://doi.org/10.1007/s41365-024-01462-w","url":null,"abstract":"One-neutron stripping process between (^{6})Li and (^{209})Bi was studied at 28, 30, and 34 MeV using the in-beam (gamma )-ray spectroscopy method. The (gamma )–(gamma ) coincident analysis clearly identified two (gamma )-rays feeding the ground and long-lived isomeric states, which were employed to determine the cross section. The one-neutron stripping cross sections were similar to the cross sections of complete fusion in the (^6)Li+(^{209})Bi system, but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region. A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping process in (^6)Li. The calculations indicated that the first excited state of (^5)Li is critical in the actual one-neutron transfer mechanism, and the valence proton of (^{209}textrm{Bi}) can be excited to the low-lying excited state in ((^{6}textrm{Li}),(^{5}textrm{Li})) reaction, unlike in the (d,p) reaction.\u0000","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":"157 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transverse mode-coupling instability with longitudinal impedance 具有纵向阻抗的横向模式耦合不稳定性

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-18 DOI: 10.1007/s41365-024-01472-8

Hai-Sheng Xu, Chun-Tao Lin, Na Wang, Jing-Ye Xu, Yuan Zhang

引用次数: 0

Cr-induced fusion reactions to synthesize superheavy elements 铬诱导聚变反应合成超重元素

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-03 DOI: 10.1007/s41365-024-01449-7

S. Madhu, H. C. Manjunatha, N. Sowmya, B. M. Rajesh, L. Seenappa, R. S. Susheela

引用次数: 0

Improved nuclear mass formula with an additional term from the Fermi gas model 利用费米气体模型的附加项改进核质量公式

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-03 DOI: 10.1007/s41365-024-01450-0

Xiao-Yu Xu, Li Deng, Ai-Xi Chen, Hang Yang, Amir Jalili, Han-Kui Wang

引用次数: 0

Ultrahigh spatiotemporal resolution beam signal reconstruction with bunch phase compensation 带束相位补偿的超高时空分辨率光束信号重建

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-03 DOI: 10.1007/s41365-024-01444-y

You-Ming Deng, Yong-Bin Leng, Xing-Yi Xu, Jian Chen, Yi-Mei Zhou

{"title":"Ultrahigh spatiotemporal resolution beam signal reconstruction with bunch phase compensation","authors":"You-Ming Deng, Yong-Bin Leng, Xing-Yi Xu, Jian Chen, Yi-Mei Zhou","doi":"10.1007/s41365-024-01444-y","DOIUrl":"https://doi.org/10.1007/s41365-024-01444-y","url":null,"abstract":"Various electromagnetic signals are excited by the beam in the acceleration and beam-diagnostic elements of a particle accelerator. It is important to obtain time-domain waveforms of these signals with high temporal resolution for research, such as the study of beam–cavity interactions and bunch-by-bunch parameter measurements. Therefore, a signal reconstruction algorithm with ultrahigh spatiotemporal resolution and bunch phase compensation based on equivalent sampling is proposed in this paper. Compared with traditional equivalent sampling, the use of phase compensation and setting the bunch signal zero-crossing point as the time reference can construct a more accurate reconstructed signal. The basic principles of the method, simulation, and experimental comparison are also introduced. Based on the beam test platform of the Shanghai Synchrotron Radiation Facility (SSRF) and the method of experimental verification, the factors that affect the reconstructed signal quality are analyzed and discussed, including the depth of the sampled data, quantization noise of analog-to-digital converter, beam transverse oscillation, and longitudinal oscillation. The results of the beam experiments show that under the user operation conditions of the SSRF, a beam excitation signal with an amplitude uncertainty of 2% can be reconstructed.","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":"92 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-resolution neutronics model for 238Pu production in high-flux reactors 高通量反应堆生产 238Pu 的高分辨率中子模型

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-06-03 DOI: 10.1007/s41365-024-01461-x

Qing-Quan Pan, Qing-Fei Zhao, Lian-Jie Wang, Bang-Yang Xia, Yun Cai, Jin-Biao Xiong, Xiao-Jing Liu

{"title":"High-resolution neutronics model for 238Pu production in high-flux reactors","authors":"Qing-Quan Pan, Qing-Fei Zhao, Lian-Jie Wang, Bang-Yang Xia, Yun Cai, Jin-Biao Xiong, Xiao-Jing Liu","doi":"10.1007/s41365-024-01461-x","DOIUrl":"https://doi.org/10.1007/s41365-024-01461-x","url":null,"abstract":"We proposed and compared three methods (filter burnup, single energy burnup, and burnup extremum analysis) to build a high-resolution neutronics model for 238Pu production in high-flux reactors. The filter burnup and single energy burnup methods have no theoretical approximation and can achieve a spectrum resolution of up to ~ 1 eV, thereby constructing the importance curve and yield curve of the full energy range. The burnup extreme analysis method combines the importance and yield curves to consider the influence of irradiation time on production efficiency, thereby constructing extreme curves. The three curves, which quantify the transmutation rate of the nuclei in each energy region, are of physical significance because they have similar distributions. A high-resolution neutronics model for 238Pu production was established based on these three curves, and its universality and feasibility were proven. The neutronics model can guide the neutron spectrum optimization and improve the yield of 238Pu by up to 18.81%. The neutronics model revealed the law of nuclei transmutation in all energy regions with high spectrum resolution, thus providing theoretical support for high-flux reactor design and irradiation production of 238Pu.","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":"39 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on a Monte Carlo global variance reduction method based on an automatic importance sampling method 基于自动重要度抽样法的蒙特卡罗全局方差缩小法研究

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-05-31 DOI: 10.1007/s41365-024-01404-6

Yi-Sheng Hao, Zhen Wu, Shen-Shen Gao, Rui Qiu, Hui Zhang, Jun-Li Li

{"title":"Research on a Monte Carlo global variance reduction method based on an automatic importance sampling method","authors":"Yi-Sheng Hao, Zhen Wu, Shen-Shen Gao, Rui Qiu, Hui Zhang, Jun-Li Li","doi":"10.1007/s41365-024-01404-6","DOIUrl":"https://doi.org/10.1007/s41365-024-01404-6","url":null,"abstract":"Global variance reduction is a bottleneck in Monte Carlo shielding calculations. The global variance reduction problem requires that the statistical error of the entire space is uniform. This study proposed a grid-AIS method for the global variance reduction problem based on the AIS method, which was implemented in the Monte Carlo program MCShield. The proposed method was validated using the VENUS-III international benchmark problem and a self-shielding calculation example. The results from the VENUS-III benchmark problem showed that the grid-AIS method achieved a significant reduction in the variance of the statistical errors of the MESH grids, decreasing from 1.08 × 10–2 to 3.84 × 10–3, representing a 64.00% reduction. This demonstrates that the grid-AIS method is effective in addressing global issues. The results of the self-shielding calculation demonstrate that the grid-AIS method produced accurate computational results. Moreover, the grid-AIS method exhibited a computational efficiency approximately one order of magnitude higher than that of the AIS method and approximately two orders of magnitude higher than that of the conventional Monte Carlo method.","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":"413 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141190643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nondestructive and active interrogation system for special nuclear material: proof of principle and initial results 特殊核材料无损主动询问系统：原理验证和初步结果

IF 2.8 1区物理与天体物理

Nuclear Science and Techniques Pub Date : 2024-05-31 DOI: 10.1007/s41365-024-01458-6

Mahmoud Bakr, Kai Masuda, Yoshiyuki Takahashi, Tsuyoshi Misawa, Norio Yamakawa, Tomas Scott

{"title":"Nondestructive and active interrogation system for special nuclear material: proof of principle and initial results","authors":"Mahmoud Bakr, Kai Masuda, Yoshiyuki Takahashi, Tsuyoshi Misawa, Norio Yamakawa, Tomas Scott","doi":"10.1007/s41365-024-01458-6","DOIUrl":"https://doi.org/10.1007/s41365-024-01458-6","url":null,"abstract":"Herein, we employ the threshold energy neutron analysis (TENA) technique to introduce the world's first active interrogation system to detect special nuclear materials (SNMs), including U-235 and Pu-239. The system utilizes a DD neutron generator based on inertial electrostatic confinement (IEC) to interrogate suspicious objects. To detect secondary neutrons produced during fission reactions induced in SNMs, a tensioned metastable fluid detector (TMFD) is employed. The current status of the system's development is reported in this paper, accompanied by the results from experiments conducted to detect 10 g of highly enriched uranium (HEU). Notably, the experimental findings demonstrate a distinct difference in the count rates of measurements with and without HEU. This difference in count rates surpasses two times the standard deviation, indicating a confidence level of more than 96% for identifying the presence of HEU. The paper presents and extensively discusses the proof-of-principle experimental results, along with the system's planned trajectory.","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":"76 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141190743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0