Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques最新文献_第4页

Multiwire Position-Sensitive Neutron Detector with Two Layers of Boron-10 双层硼-10 多线位置敏感中子探测器

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700630

S. I. Potashev, A. A. Afonin, Yu. M. Burmistrov, A. I. Drachev, A. A. Kasparov, S. Kh. Karaevsky, I. V. Meshkov, V. N. Ponomarev, V. I. Razin

{"title":"Multiwire Position-Sensitive Neutron Detector with Two Layers of Boron-10","authors":"S. I. Potashev, A. A. Afonin, Yu. M. Burmistrov, A. I. Drachev, A. A. Kasparov, S. Kh. Karaevsky, I. V. Meshkov, V. N. Ponomarev, V. I. Razin","doi":"10.1134/S1027451024700630","DOIUrl":"10.1134/S1027451024700630","url":null,"abstract":"Multiwire position-sensitive neutron detector with two layers of boron-10 has been developed to detect both thermal and fast neutrons. Sensitive dimensions of two coordinate neutron detectors are 50 × 50 mm. New detector characteristics are compared with those of a 100 × 100 mm detector built earlier which we used in neutron flux spatial distribution measurements. Plane-parallel design of the new detector has symmetrical structure with respect to wire anode and also includes two intermediate grids and two cathodes made of parallel wires with 2 mm pitch and two silicon substrates coated with boron-10 layers of 0.003 mm thickness. Detector geometry and working gas mixture and pressure are chosen so as to ensure full absorption of secondary alpha particle from reaction with thermal neutron within detector gas medium half thickness. Neutron coordinates are determined from measured ionization loss pulse heights produced by secondary nuclei. The detector expected efficiency to thermal neutrons is about 5%. The detector can be used in small-angle and diffraction scattering setups in condensed matter physics.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"908 - 912"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413966","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

Read-Out System for Thermal Neutron Detectors Based on ZnS(Ag)/LiF Scintillator 基于 ZnS（Ag）/LiF 闪烁器的热中子探测器读出系统

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700617

V. N. Marin, D. N. Trunov, V. S. Litvin, R. A. Sadykov, E. V. Altynbaev

{"title":"Read-Out System for Thermal Neutron Detectors Based on ZnS(Ag)/LiF Scintillator","authors":"V. N. Marin, D. N. Trunov, V. S. Litvin, R. A. Sadykov, E. V. Altynbaev","doi":"10.1134/S1027451024700617","DOIUrl":"10.1134/S1027451024700617","url":null,"abstract":"Neutron scintillation detectors based on ZnS(Ag)/LiF, solid-state photomultipliers, and an organic glass light guide developed at the Institute for Nuclear Research, Russian Academy of Sciences (INR RAS) are successfully used in neutron diffractometers facilities at the INR RAS as a replacement for standard counters based on 3He. These detectors use optical light guides with diffuse reflection, which makes it possible to multiply the recorded signal (up to 95 photoelectrons) in comparison with detectors with wavelength shifting fibers. The article describes two types of bias circuit for silicon photomultipliers. A method of dynamic bias has been proposed, which makes it possible to reduce the recovery time of a silicon photomultiplier and to increase the loading capacity of neutron detectors by a factor of 8. Simulation and comparison of two types of preamplifiers showed an increase in the loading capacity. The new electronics makes it possible to increase the loading capacity of the detectors up to 400 kHz. A circuit for digital control of discrimination thresholds has been developed and described. A new data acquisition system for time-of-flight neutron diffractometers for 80 detectors with the possibility of scaling has been developed.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"894 - 899"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413975","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

Coefficients of Light-Ion Reflection from a Solid Surface 固体表面的光离子反射系数

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S102745102470054X

V. P. Afanas’ev, L. G. Lobanova, V. I. Shulga

{"title":"Coefficients of Light-Ion Reflection from a Solid Surface","authors":"V. P. Afanas’ev, L. G. Lobanova, V. I. Shulga","doi":"10.1134/S102745102470054X","DOIUrl":"10.1134/S102745102470054X","url":null,"abstract":"An analytical theory of the reflection of light ions from solids is presented. The theory is based on the method of solving the elastic scattering problem (the Oswald–Kasper–Gauckler method), successfully tested in the theory of electron scattering. The solution of a boundary value problem for light ion reflection from solids based on the invariant imbedding method is constructed. Particle interaction with amorphous and polycrystalline samples is considered. Analytical formulas for calculating the integral reflection coefficients of particles and energy are obtained. It is shown that an analytical solution can be obtained only within the framework of a small-angle approximation. The obtained analytical solutions are based on the path length distribution function taking into account the maximum residual range. It is demonstrated that within the framework of the analytical theory the reflection coefficients are determined by two dimensionless parameters: the ratio of the residual range to the transport path length and the screening parameter. The results of theoretical consideration are compared with the data of computer simulation. Numerical calculations are performed for the case of reflection of protons with initial energy E0 = 1–10 keV from Be, C, Cu, and W targets for different scattering geometries. The results of the calculated integral reflection coefficients of particles and energy show satisfactory agreement between analytics and computer simulation.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"846 - 850"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413980","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

Stability of the Magnetic Subsystem of 2D Magnets within the Crystal Orbital Hamilton Population Method 晶体轨道汉密尔顿种群法中二维磁体磁性子系统的稳定性

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700563

L. I. Kushchuk, D. K. Veretimus, P. V. Lega, A. Yu. Antonenkova, A. I. Kartsev

引用次数: 0

Effect of ({text{O}}_{2}^{ + }) Ion Implantation on the Elemental and Chemical Composition of the Si(111) Surface 离子注入对 Si(111) 表面元素和化学成分的影响

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-07-15 DOI: 10.1134/S1027451024700162

G. Kh. Allayarova, B. E. Umirzakov, A. K. Tashatov

引用次数: 0

Impact Mill 冲击磨

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-07-15 DOI: 10.1134/S1027451024700228

A. S. Azhgalieva, D. N. Borisenko, N. N. Kolesnikov, A. A. Zhokhov

引用次数: 0

Impregnation of Graphite with Aluminum under High Pressure 高压下用铝浸渍石墨

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-07-15 DOI: 10.1134/S1027451024700204

A. A. Antanovich

引用次数: 0

On the Shift of the Maximum of the Polar Angular Distribution of Sputtered Atoms in the MD Model of the (001) Ni Face Sputtering 论 (001) 镍面溅射 MD 模型中溅射原子极角分布最大值的移动

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-07-15 DOI: 10.1134/S1027451024700253

A. I. Musin, V. N. Samoilov

引用次数: 0

New Polymorphic Varieties of Boron Nitride with Diamond-Like TA-Type Phases 具有类金刚石 TA 型相的氮化硼多态新品种

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-07-15 DOI: 10.1134/S1027451024700356

D. S. Ryashentsev, V. A. Burmistrov

{"title":"New Polymorphic Varieties of Boron Nitride with Diamond-Like TA-Type Phases","authors":"D. S. Ryashentsev, V. A. Burmistrov","doi":"10.1134/S1027451024700356","DOIUrl":"10.1134/S1027451024700356","url":null,"abstract":"A theoretical study of new polymorphic varieties of boron nitride, which have diamond-like structures with boron and nitrogen atoms in equivalent structural positions, was carried out. The model construction of new phases of boron nitride was performed in the process of crosslinking of precursor nanostructures. Single-walled boron nitride nanotubes with chirality indices (3;0), (4;0), and (6;0) were chosen as precursors for the model construction of diamond-like phases. Using the density functional theory method in the generalized gradient approximation, the possibility of stable existence of three new structural varieties of boron nitride with a diamond-like structure, namely, BN-TA4, BN-TA5, and BN-TA6, was established: the structure of the BN-TA7 diamond-like phase turned out to be unstable and, in the process of geometric optimization, was transformed into the initial structure, a boron nitride nanotube (6;0). As a structural characteristic, the bulk density of new polymorphs was determined to be in the range from 2.613 to 3.0836 g/cm3. The sublimation energy of new polymorphic varieties ranged from 17.16 to 17.63 eV/(BN). The value of the band gap near the Fermi energy varied from 5.37 to 5.74 eV.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 3","pages":"712 - 716"},"PeriodicalIF":0.5,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718783","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

Lead Slowing-Down Neutron Spectrometry II: Cross-Section Data for 243Cm(n,f ), 244Cm(n,f ), 245Cm(n,f ), 246Cm(n,f ), 247Cm(n,f ), 248Cm(n,f ) at Energies up to 100 keV 铅减速中子能谱 II：能量高达 100 千伏的 243Cm(n,f)、244Cm(n,f)、245Cm(n,f)、246Cm(n,f)、247Cm(n,f)、248Cm(n,f) 的截面数据

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-07-15 DOI: 10.1134/S102745102470040X

E. A. Koptelov

{"title":"Lead Slowing-Down Neutron Spectrometry II: Cross-Section Data for 243Cm(n,f ), 244Cm(n,f ), 245Cm(n,f ), 246Cm(n,f ), 247Cm(n,f ), 248Cm(n,f ) at Energies up to 100 keV","authors":"E. A. Koptelov","doi":"10.1134/S102745102470040X","DOIUrl":"10.1134/S102745102470040X","url":null,"abstract":"The capabilities of lead slowing-down neutron spectrometry are demonstrated. The paper reviews the results of a series of studies on the measurement of the fission cross sections of curium isotopes 243Cm, 244Cm, 245Cm, 246Cm, 247Cm, and 248Cm by neutrons with energies below 100 keV. These studies were carried out by a joint group of researchers from the Institute for Nuclear Research, Russian Academy of Sciences (INR RAS), and the State Scientific Center of the Russian Federation, Leypunsky Institute of Physics and Power Engineering (SSC RF LIPPE) using an SVZ-100 lead slowing-down neutron spectrometer. This third-generation spectrometer possesses high luminosity, enabling the investigation of neutron-nuclear processes in microgram-scale samples of radioactive nuclides, which is unattainable in experiments using time-of-flight spectrometry. The results of research at the INR RAS and the SSC RF LIPPE are reflected in international nuclear data repositories, supplementing known experimental data and indicating, in several cases, the need for adjustments to recommended values.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 3","pages":"745 - 758"},"PeriodicalIF":0.5,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718828","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