EPJ Web of Conferences最新文献_第9页

Effect of correlation between cross sections and angular distributions in nuclear data of 63Cu on estimation of uncertainty of neutron penetration 63Cu核数据截面与角分布相关性对中子侵彻不确定度估算的影响

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202328100003

N. Yamano, T. Inakura, C. Ishizuka, Satoshi Chiba

{"title":"Effect of correlation between cross sections and angular distributions in nuclear data of 63Cu on estimation of uncertainty of neutron penetration","authors":"N. Yamano, T. Inakura, C. Ishizuka, Satoshi Chiba","doi":"10.1051/epjconf/202328100003","DOIUrl":"https://doi.org/10.1051/epjconf/202328100003","url":null,"abstract":"Uncertainty in neutron reaction rates after penetrating a 608mm-thick copper benchmark experiment performed by the FNS facility of JAEA was estimated based on two different kinds of the Total Monte Carlo methods under random sampling methodology. 500 random nuclear data files were generated for 63Cu by the T6 code system with perturbing underlying model parameters. In the first method, these files were used directly to yield processed library preserving all the correlations among different physical quantities. In the second method, the random files populated by T6 were used but the angular distribution data were kept fixed to the non-perturbed nominal ones. It was found that the two methods gave the same neutron reaction rate after the 608 mm penetration of a copper, however uncertainty of the second method was larger than that of the first method. It shows that the correlation between total cross section and angular distribution of elastic scattering at 0 degree, which stems from Wick’s inequality, affects uncertainty of the calculated neutron reaction rate. The result is consistent with the case of 28Si on deep penetration of thick concrete problem previously reported by the authors. It could be concluded that the uncertainty obtained by using the covariance files given in the ENDF-6 format may not give correct results for the uncertainty of neutron penetration calculation.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80929215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neutron-induced charged-particle reaction studies in nuclear astrophysics with a Micromegas based gaseous detector 核子天体物理中中子诱导带电粒子反应的微气体探测器研究

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202327909003

C. Yadav, A. Green, M. Friedman

引用次数: 1

Charge polarization calculated with a microscopic model for the ﬁssion fragments of U-236 用U-236裂变碎片的微观模型计算电荷极化

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202328404008

S. Ebata, Shin Okumura, C. Ishizuka, Satoshi Chiba

引用次数: 1

Development of Future Electromagnetic Calorimeter Technologies and Applications for the Electron-Ion Collider with GEANT4 Simulations 未来电磁量热计技术的发展及其在电子-离子对撞机中的应用

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202327605001

Z. Shi, C. Woody, Ian Delk, J. Lajoie

{"title":"Development of Future Electromagnetic Calorimeter Technologies and Applications for the Electron-Ion Collider with GEANT4 Simulations","authors":"Z. Shi, C. Woody, Ian Delk, J. Lajoie","doi":"10.1051/epjconf/202327605001","DOIUrl":"https://doi.org/10.1051/epjconf/202327605001","url":null,"abstract":"The Electron-Ion Collider (EIC) is a future collider planned to be built at BNL in about a decade. It will provide physicists with high luminosity and highly polarized beams with a wide range of nuclei species at different energies, covering an extensive kinematic range. The EIC physics goals include measuring the Generalized Parton Distribution (GPD) from Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP) experiments, performing precision 3D imaging of the nuclei structure, studying color confinement and hadronization mechanisms, and understanding the spin structure of the proton. In order to meet the physics goals of EIC, a highresolution electromagnetic calorimeter (EMCAL) is required to measure electrons and photons and to achieve good particle identification. We propose to develop a tungsten/shashlik (W/shashlik) EMCAL with better readout configuration to achieve better energy and position resolution. In this work, we will present the GEANT4 detector simulation results ofWand Pb shashlik EMCAL to study π0 merging probability as a function of π0 energy and the performance of position and energy resolutions of the EMCAL for ECCE design.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"192 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72822556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Marginalization methods for the production of conservative covariance on nuclear data 核数据保守协方差产生的边缘化方法

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202328100024

P. Tamagno

{"title":"Marginalization methods for the production of conservative covariance on nuclear data","authors":"P. Tamagno","doi":"10.1051/epjconf/202328100024","DOIUrl":"https://doi.org/10.1051/epjconf/202328100024","url":null,"abstract":"The production of evaluated nuclear data consists not only in the determination of best estimate values for the quantities of interest but also on the estimation of the related uncertainties and correlations. When nuclear data are evaluated with underlying nuclear reaction models, model parameters are expected to synthesize all the information that is extracted from the experimental data they are adjusted on. When dealing with models with a small number of parameters compared to the number of experimental data points – e.g. in resonant cross section analysis – one sometimes faces excessively small evaluated uncertainty compared for instance with model/experimental data agreement. To solve this issue, an attempt was to propagate the uncertainty coming from experimental parameters involved in the data reduction process on the nuclear physics model parameters. It pushed experimentalists to separately supply random (statistical) and systematic uncertainties. It also pushed evaluators to include or mimic the data reduction process in the evaluation. In this way experimental parameters – also called nuisance parameters – could be used to increase evaluated parameter uncertainty through marginalization techniques. Two of these methods: Matrix and Bayesian marginalizations – respectively called sometimes Analytical and Monte-Carlo Marginalizations – that are currently used for evaluation will be discussed here and some limitations highlighted. A third alternative method, also based on a Bayesian approach but using the spectral decomposition of the correlation matrix, is also presented on a toy model, and on a a simple case of resonant cross section analysis.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"197 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79858262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laboratory magnetoplasmas as an ideal experimental environment for nuclear astrophysics β-decay studies 实验室磁等离子体是核天体物理β衰变研究的理想实验环境

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202327502008

E. Naselli

引用次数: 0

Experiments with reduced single pass absorption at ASDEX Upgrade – instrumentation and applications 在ASDEX升级上减少单通吸收的实验-仪器和应用

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202327702008

M. Schubert, J. Stober, A. Herrmann, E. Grigore, W. Kasparek, C. Lechte, F. Monaco, B. Petzold, B. Plaum, E. Poli, C. Ruset, S. Vorbrugg, D. Wagner

引用次数: 1

Impact of the electromagnetic field on Z0 leptonic invariant mass in ultrarelativistic heavy ion collisions 电磁场对超相对论重离子碰撞中Z0轻子不变质量的影响

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202327602019

Yifeng Sun, V. Greco, Xin-Nian Wang, S. Plumari

引用次数: 0

Zirconium Nuclear Data Campaign: Measurement of 90Zr (n, γ) cross section 锆核数据运动:90Zr (n， γ)截面的测量

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202328401011

Jesse M. Brown, K. Guber, C. Paradela, P. Schillebeeckx, S. Kopecky

引用次数: 0

Covariance analysis of 235U(nth,f) independent and cumulative fission yields: Propositions for JEFF4 235U(n,f)独立和累积裂变产率的协方差分析:JEFF4的命题

EPJ Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/epjconf/202328100022

G. Kessedjian, S. Cheikh, Oliver Serot, A. Chebboubi, D. Bernard, V. Vallet, R. Mills, L. Capponi

{"title":"Covariance analysis of 235U(nth,f) independent and cumulative fission yields: Propositions for JEFF4","authors":"G. Kessedjian, S. Cheikh, Oliver Serot, A. Chebboubi, D. Bernard, V. Vallet, R. Mills, L. Capponi","doi":"10.1051/epjconf/202328100022","DOIUrl":"https://doi.org/10.1051/epjconf/202328100022","url":null,"abstract":"The study of fission yields has a major impact on the characterization and understanding of the fission process and its applications. Fission yield evaluations represent the synthesis of experimental and theoretical knowledge in order to perform the best estimation of independent fission yields. Today, the lack of correlations between the different fission observables induces several inconsistencies in the evaluations. Different works proposed to estimate the correlations of the independent fission yields satisfying the consistency to the chain yield evaluations. Nevertheless, none of them introduces a prior correlations of the independent and chain evaluations in the evaluation process. Covariance matrix of fission yields depends on the evaluation method used according to the kinds of existing measurements. The consistency is deeply entangled to the statistical agreement between each dataset considering the covariance of measurements. Moreover, covariance of model parameters does not represent the only contribution to the evaluation covariance matrix. Thus, a new evaluation process is crucial to provide a complete and coherent evaluation file. The LEPh Laboratory of CEA Cadarache is developing this program for the future version of the JEFF-library.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82148811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0