Journal of Neutron Research最新文献

{"title":"Nuclear data development at the European Spallation Source","authors":"J. Damián, D. Dijulio, G. Muhrer","doi":"10.3233/JNR-210014","DOIUrl":"https://doi.org/10.3233/JNR-210014","url":null,"abstract":"Transport calculations for neutronic design require accurate nuclear data and validated computational tools. In the Spallation Physics Group, at the European Spallation Source, we perform shielding and neutron beam calculations to help the deployment of the instrument suite for the current high brilliance (top) moderator, as well for the design of the high intensity bottom moderator, currently under study for the facility. This work includes providing the best available nuclear data in addition to improving models and tools when necessary. In this paper we present the status of these activities, which include a set of thermal scattering kernels for moderator, reflector, and structural materials, the development of new kernels for beryllium considering crystallite size effects, nanodiamonds, liquid hydrogen and deuterium based on path integral molecular dynamics, and the use of the software package NCrystal to assist the development of nuclear data in the framework of the new HighNESS project.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-210014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43002369","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":"Investigation of multiple Bragg reflections and their possible exploitation","authors":"P. Mikula, J. Šaroun, P. Strunz, V. Ryukhtin","doi":"10.3233/JNR-200185","DOIUrl":"https://doi.org/10.3233/JNR-200185","url":null,"abstract":"This paper summarizes recent results of an exhaustive experimental study of multiple Bragg reflections accompanying allowed as well as forbidden reflections. The multiple reflection observations were carried out in the frame of Bragg diffraction optics experiments on cylindrically bent perfect single crystals. It has been found that depending on the thickness and curvature of the crystal slabs and the diffraction geometry (reflection, transmission), many strong multiple reflections can be excited which can also be used as a source of highly monochromatic and highly collimated beams for further experiments requiring extremely high resolution.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":"1-23"},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-200185","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093038","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":"Sergey V. Maleyev (1931–2021)","authors":"D. Aristov, S. Grigoriev, A. Syromyatnikov, A. Yashenkin","doi":"10.3233/jnr-210020","DOIUrl":"https://doi.org/10.3233/jnr-210020","url":null,"abstract":"The outstanding physicist passed away on February, 20, 2021, a few months before his 90th anniversary. Sergey Vladimirovich Maleyev was born June 3, 1931, Yerevan. The World War II caught Sergey Maleyev in Leningrad. In December his family was evacuated from a sieged city in extremely malnourished condition. His father died during the evacuation. Sergey Maleyev graduated from high school in 1949 and entered the Faculty of Physics of Leningrad State University. Then he transferred to the Physics and Mathematics Faculty of Kharkov University and graduated from it in 1954. From 1954 to 1967 he worked at the Ioffe Physico-Technical Institute in Leningrad. In 1967, Sergey Vladimirovich organized the Department of solid-state theory, which he headed until 1997, and in which he worked until the end of his life. He earned a scientific degree of a Candidate of Sciences in Physics and Mathematics in 1958 and a Doctor of Sciences in 1974. The contribution of Sergey Maleyev to the development of national and world science cannot be overestimated. His works are widely known, their results having long become classics that went down in university textbooks. Among them there are:","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-210020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093611","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":"Editorial Proc. UCANS-web Conference, Nov. 30–Dec. 3 2020","authors":"D. Baxter, T. Gutberlet, Y. Otake, F. Ott, Xuewu Wang","doi":"10.3233/jnr-210022","DOIUrl":"https://doi.org/10.3233/jnr-210022","url":null,"abstract":"Compact accelerator-based neutron sources (CANS) represent a growing technology to provide neutrons in many areas of research and applications. Based on nuclear processes initiated by low energy proton or deuteron beams or the nuclear photo effect using electron beams, very compact neutron sources have been designed and installed at universities, research institutes, and industrial sites accross the globe. These small sources have provided continuous impact in fundamental nuclear physics as well as in material sciences, engineering, metrology or health. In most recent years partly driven by the advent of reactor based neutron sources and the desire for local and mobile neutron sources and partly by progress in high current proton accelerator systems, efforts are increasing to develop, design and construct very powerful CANS. One goal of these efforts is to provide future midand large-scale neutron sources complementary to spallation and reactor based sources, while another is to provide local services for industry or health e.g. as neutron imaging services or with boron neutron capture therapy to fight cancer. The Union for Compact Accelerator-driven Neutron Sources (UCANS) is organizing regular meetings to discuss the state of the art and developments on this topic. The UCANS9 conference was planned to be held in Wako, Japan in November 2020. Due to the global coronavirus outbreak the conference could not happen and was postponed to a future date in 2021. As an intermediate activity a web-based meeting was organized termed UCANS-web Conference and held from Nov. 30 to Dec. 3 2020 with a world-wide attendance of many scientists and researchers. The virtual conference covered a very wide range of topics on most aspects of compact sources, accelerators, targets, moderators, detectors, neutron scattering, radiography, isotope and nuclear data, medical applications as documented at the conference website (ucans-web.org). The diverse and varied presentations and discussions at this virtual meeting inspired the participants and organizers to publish presented work within a proceedings volume in the Journal of Neutron Research. The present contributions deal with basic nuclear data evaluation by improved scattering kernels, the development of versatile beam monitoring and multiplexing systems as well as the design and configuration of optimized target-moderator combinations to improve neutron flux. They further present novel instrumentation concepts and the plans and outlines for novel CANS facilities. Although these articles represent only a fraction of all of the presented contributions within the UCANS-web Conference, they demonstrate the progress and state-of-the-art in this fast-emerging field. Upcoming conferences, workshops and UCANS meetings will show further progress and developments and the present proceedings will support all these discussions and activities to develop and optimize CANS.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-210022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093795","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":"Enhancement of sub-thermal neutron flux through cold polyethylene","authors":"D. Fritz, Y. Danon, E. Liu","doi":"10.3233/jnr-210010","DOIUrl":"https://doi.org/10.3233/jnr-210010","url":null,"abstract":"Total thermal neutron cross section measurements serve as the primary means of validation for thermal neutron scattering kernels, an important quantity for neutron transport calculations. In an effort to improve the quality of thermal neutron scattering kernels, researchers at Rensselaer Polytechnic Institute (RPI) designed and constructed a polyethylene based cold moderation system to enhance neutron flux below 10 meV when coupled with the Enhanced Thermal Target (ETT) at the RPI Gaerttner LINAC. The final design yielded an increase in sub-thermal neutron flux (below 10 meV) by a factor of 4.5 for a moderator temperature of 37.5 K relative to the ETT alone. A further increase to a factor of 6 is expected after a minor geometry modification and decrease in polyethylene temperature to 25 K. This novel capability will be used to conduct total thermal neutron cross section measurements from 0.0005–10 eV for different materials including moderator materials.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-210010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093941","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":"Developments of a multiplexer system for the High-Brilliance Neutron Source HBS","authors":"M. Rimmler, O. Felden, U. Rücker, H. Soltner, P. Zakalek, R. Gebel, T. Gutberlet, T. Brückel","doi":"10.3233/jnr-210009","DOIUrl":"https://doi.org/10.3233/jnr-210009","url":null,"abstract":"The High-Brilliance Neutron Source project (HBS) aims at developing a medium-flux accelerator-driven neutron source based on a 70 MeV, 100 mA proton accelerator. The concept optimizes the facility such that it provides high-brilliance neutron beams for instruments operating at different time structures. This can be realized by generating an interlaced proton pulse structure, which is unraveled and sent to three different target stations by a multiplexer system. In the following we present the developments of a multiplexer system at the JULIC accelerator at Forschungszentrum Jülich GmbH (FZJ), which serves as test facility for HBS. The main components of the JULIC multiplexer system are designed to be scalable to the HBS parameters.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-210009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093772","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":"Wide-aperture back-scattering detector (BSD) for the High-Resolution Fourier Diffractometer (HRFD) at the IBR-2 reactor","authors":"V. Kruglov, A. Balagurov, M. Belova, I. Bobrikov, A. Bogdzel’, V. Bodnarchuk, V. V. Bulavina, O. Daulbaev, V. Drozdov, V. Zhuravlev, A. Kirilov, S. Kulikov, A. K. Kurilkin, V. Milkov, S. Murashkevich, M. M. Podlesnyy, V. I. Prikhod’ko, A. Churakov, V. Shvetsov","doi":"10.3233/jnr-210001","DOIUrl":"https://doi.org/10.3233/jnr-210001","url":null,"abstract":"The high-resolution Fourier diffractometer (HRFD) operates at the IBR-2 pulsed reactor, on which the correlation method of data registering has been implemented using a fast Fourier chopper and specialized electronics. A wide-aperture ring back-scattering detector for HRFD has been developed. The detector consists of six Z n S ( A g ) / 6 L i F-scintillation rings, each one of which is divided into 12 sections. Main parameters of this detector: covered solid angle 2 θ = ( 133 − 175 ) ∘ ; Ω d ≈ 2.0 sr; average absorption efficiency 85 %, geometric contribution to resolution Δ d / d < 0.0005. The concept of a detector and its data acquisition system are presented.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-210001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093697","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":"WAVE – An innovative magnet devoted to spintronics","authors":"T. Robillard, P. Lavie, A. Dael, G. Aubert, P. Brédy, A. Madur, C. Berriaud, J. Rifflet, D. Nguyen-Ba, S. Klimko, G. Exil, X. Fabrèges, S. Petit, A. Bataille","doi":"10.3233/JNR-200167","DOIUrl":"https://doi.org/10.3233/JNR-200167","url":null,"abstract":"The LLB is part of a large project aiming at the development of experimental tools available for the spintronics community. This includes the design and construction of vector magnets for neutron and X-ray scattering (deployed on the Léon Brillouin-Orphée and Synchrotron SOLEIL TGIRs: neutron diffractometer 6T2 and XMRS Sextants). For neutron scattering, a very innovative design has been developed, relying solely on the use of vertical axis coils. This magnet called WAVE (for Wide Aperture VEctor) is now available at the LLB-Orphée for the user community.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-200167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47576215","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":"Design of low profile sample stage","authors":"S. Cooper","doi":"10.3233/jnr-200169","DOIUrl":"https://doi.org/10.3233/jnr-200169","url":null,"abstract":"The Italian Neutron Experimental Station, or INES for short, instrument beamline at the ISIS Neutron and Muon Spallation Source recently underwent an upgrade to its sample positioning area to improve the sample handling capability and capacity of the instrument. INES is a powder diffractometer instrument devoted to materials characterization and cultural heritage studies. Due to the types of samples received for cultural heritage studies the instrument scientists wanted to maximize the height of samples that could be scanned with the instrument. This paper covers the in-house design and delivery of a new, two axis, linear positioning stage for INES that due to the addition of a new linear height stage, needed to be as low profile as possible to give the instrument scientists the sample capacity they required.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-200169","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41543170","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":"23rd Meeting of the International Collaboration on Advanced Neutron Sources Organized by the Neutron Sciences Directorate at the Oak Ridge National Laboratory (ORNL) Chattanooga Convention Center, Chattanooga, TN (USA) 13–18 October 2019","authors":"K. Herwig, E. Iverson","doi":"10.3233/jnr-200183","DOIUrl":"https://doi.org/10.3233/jnr-200183","url":null,"abstract":"","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"22 1","pages":"87-90"},"PeriodicalIF":1.1,"publicationDate":"2020-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-200183","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41433879","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}