15.International Conference on Nuclear Data for Science and Technology (ND2022), Held Virtually, Sacramento, CA (United States), 21-29 Jul 2022最新文献

{"title":"Thermal Cross Section Measurements At The RPI LINAC [Slides]","authors":"D. Fritz, Y. Danon, A. Ney, P. Brain, Sukhjinder Singh, K. Cook, Benjamin Wang, M. Rapp, T. Trumbull, M. Zerkle, J. Holmes, C. Chapman, G. Arbanas, Jesse M. Brown, K. Ramić","doi":"10.2172/1900399","DOIUrl":"https://doi.org/10.2172/1900399","url":null,"abstract":"Recently, a cold moderator was designed and developed for use at the Rensselaer Polytechnic Institute Linear Accelerator (RPI LINAC). This cold moderator proved to easily and safely couple to an existing neutron producing target, while enhancing neutron flux below 0.02 eV by up to a factor of 8 by cooling polyethylene down to 29 K. This cold moderator capability allowed for significantly improved counting statistics below 0.02 eV not previously possible due to a poor signal to background ratio. Additionally, testing was performed to characterize the energy resolution of the new cold moderator system and found the system easily capable of resolving resonances in Ta-181 at 4 and 10 eV, while also clearly resolving the Bragg edges found in Be metal below 0.01 eV. Following the design and development of a cold polyethylene moderator, a series of thermal total cross section measurements were performed for polyethylene, polystyrene, Plexiglas and yttrium hydride in the thermal region. These measurements serve to help validate thermal scattering law (TSL) evaluations in the 0.0005 – 1 eV energy range. For polyethylene and polystyrene, two sets of experiments were performed – one with the Enhanced Thermal Target (ETT) and another with the ETT plus the new cold moderator capability (ETTC). The yttrium hydride and Plexiglas measurements were only performed with the ETTC. The measurements for polyethylene help to validate the data processing methodology when using the ETTC, while extending the measured range of polyethylene down to 0.0005 eV. Two different Plexiglas, Plexiglas G and Plexiglas G-UVT, and two different concentrations of yttrium hydride, H/Y = 1.85 and 1.68, were measured. Overall, all materials had generally good agreement with their ENDF/B-VIII.0 TSL evaluations, though some discrepancies were noticed. In the case of the yttrium hydride, the high energy oscillations in the hydrogen cross section and the low energy Bragg edges in the yttrium cross section were clearly seen. These measurements represent the first total cross section measurements that encompass the entire thermal region from 0.0005 – 1 eV for polystyrene and yttrium hydride.","PeriodicalId":405872,"journal":{"name":"15.International Conference on Nuclear Data for Science and Technology (ND2022), Held Virtually, Sacramento, CA (United States), 21-29 Jul 2022","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130393570","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}

{"title":"Development of a New Fixed-source Sensitivity Tally Capability in the MCNP® Code [Slides]","authors":"M. Rising, A. Clark","doi":"10.2172/1898128","DOIUrl":"https://doi.org/10.2172/1898128","url":null,"abstract":"The development of a new fixed-source sensitivity tally capability, targeted toward nuclear data parameters, is currently underway in the MCNP code. In recent research and development efforts that utilize machine learning to both seek problematic nuclear data as well as design experiments optimized to improve the nuclear data, the adjoint-weighted k-eigenvalue sensitivity tally capabilities have been essential. In this paper, the motivation to expand the sensitivity tally capabilities beyond k-eigenvalues toward diverse fixed-source problems along with preliminary results and verification will be discussed.","PeriodicalId":405872,"journal":{"name":"15.International Conference on Nuclear Data for Science and Technology (ND2022), Held Virtually, Sacramento, CA (United States), 21-29 Jul 2022","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128222273","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}

{"title":"Updates and Validation for the n+63,65Cu Cross Sections [Slides]","authors":"J. McDonnell, M. Pigni","doi":"10.2172/1901557","DOIUrl":"https://doi.org/10.2172/1901557","url":null,"abstract":"","PeriodicalId":405872,"journal":{"name":"15.International Conference on Nuclear Data for Science and Technology (ND2022), Held Virtually, Sacramento, CA (United States), 21-29 Jul 2022","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129206638","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}

{"title":"140,142Ce Neutron Cross Section Resolved Resonance Region Evaluation [Slides]","authors":"C. Chapman, M. Pigni, K. Guber, G. Arbanas","doi":"10.2172/1900249","DOIUrl":"https://doi.org/10.2172/1900249","url":null,"abstract":"A resolved resonance region evaluation of 140,142Ce was conducted by Oak Ridge National Laboratory. Requested by the US Nuclear Criticality Safety Program, this evaluation is based on recent high-resolution transmission and capture high-resolution measurements of natCe and 142Ce conducted at JRC-Geel at the Geel Linear Accelerator facility. It is also based on recently measured thermal constants available from the EXFOR database [1]. Starting from the resonance parameters from the ENDF/B-VIII.0 library [2] and following a preliminary R-matrix analysis [3], an updated set of resonance parameters and corresponding covariance information was derived by the fit of these experimental datasets using the Reich–Moore approximation of the R-matrix theory, as implemented in the SAMMY code system [4]. The resolved resonance region upper energy limit for 140Ce was kept at 200 keV, whereas the 142Ce resonance region was extended from 13 to 26 keV. This new evaluation was found to be in good agreement not only with several integral quantities of interest to the reactor physics community, but also with the stellar Maxwellian-averaged cross section [5].","PeriodicalId":405872,"journal":{"name":"15.International Conference on Nuclear Data for Science and Technology (ND2022), Held Virtually, Sacramento, CA (United States), 21-29 Jul 2022","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129767348","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}

{"title":"Generalized Bayesian Monte Carlo Evaluation [Slides]","authors":"Jesse M. Brown, G. Arbanas, D. Wiarda","doi":"10.2172/1901525","DOIUrl":"https://doi.org/10.2172/1901525","url":null,"abstract":"","PeriodicalId":405872,"journal":{"name":"15.International Conference on Nuclear Data for Science and Technology (ND2022), Held Virtually, Sacramento, CA (United States), 21-29 Jul 2022","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122039641","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}

{"title":"239Pu R-matrix Analysis and Neutron Fission Multiplicities in the Neutron Energy Region up to 5 keV","authors":"M. Pigni","doi":"10.2172/1901586","DOIUrl":"https://doi.org/10.2172/1901586","url":null,"abstract":"","PeriodicalId":405872,"journal":{"name":"15.International Conference on Nuclear Data for Science and Technology (ND2022), Held Virtually, Sacramento, CA (United States), 21-29 Jul 2022","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124594718","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}