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Artykuły w czasopismach na temat „Neutron absorption”

Autor: Grafiati

Data publikacji: 30 listopada 2024

Data aktualizacji: 31 lipca 2025

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1

Wang, Haoran, Shuo Zhao, Junqing Han, Yuying Wu, Xiangfa Liu, and Zuoshan Wei. "Neutron-Absorption Properties of B/Cu Composites." Materials 16, no. 4 (2023): 1443. http://dx.doi.org/10.3390/ma16041443.

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Copper has high electrical and thermal conductivity, which is frequently employed in structural and functional materials. In this research, powder metallurgy was used to incorporate boron nanosheets into metal matrix composites to create boron dispersion-enhanced copper matrix composites. The neutron-absorption characteristics of composite materials were investigated, as well as the link between neutron-absorption cross-section and neutron energy. The results told us that the morphology of the second phase on the particle surface is closely related to the size of Cu-B particles, copper and bor

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2

Selke, David L. "Physics Essay: Repulsionless Fusion by Neutron Absorption." Applied Physics Research 8, no. 6 (2016): 30. http://dx.doi.org/10.5539/apr.v8n6p30.

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<p class="1Body">It is possible to build Helium-4 from Hydrogen-1 by adding only neutrons. The key step is that Tritium decays to Helium-3; thus, a particle that entered the nucleus as a neutron becomes a proton. The need to overcome the mutual repulsion of positively charged nuclei is thus avoided. Given a cheap enough neutron source, this method promises fusion without Sun-like conditions.</p>

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3

Mahdavi, Mohammad, and Maryam Shahbahrami. "Multiplication of Fast Neutrons Source Flux by Using Deuterium-Helium-3 Plasma." ISRN High Energy Physics 2013 (May 30, 2013): 1–4. http://dx.doi.org/10.1155/2013/689739.

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The production of fast neutrons source is examined by using a thermal neutron flux inside plasma. In order to reach a favorable yield of fast neutrons flux, the parameters such as energy loss rate, reaction probability, and neutron absorption length are calculated. The nuclear conversion efficiency, , of thermal neutron to fast neutrons is obtained to be by calculating the physical parameters for the plasma designed.

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4

Volz, Heather M., Sven C. Vogel, J. A. Roberts, A. C. Lawson, D. J. Williams, and L. L. Daemen. "Effect of Strong Neutron Absorption on Texture and Diffraction Data Analysis." Materials Science Forum 495-497 (September 2005): 119–24. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.119.

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The impact of strong neutron absorption on data analysis and the comparison of two different absorption corrections for neutron diffraction data implemented in the GSAS Rietveld code are the foci of this work. We investigated the effect of absorption on the texture and the thermal motion parameter for rolled elemental foils. The orientation distribution functions (ODF) of rolled foils of dysprosium and erbium metals were determined from neutron time-of-flight data patterns collected on HIPPO at LANSCE. Both Dy and Er are strong absorbers for thermal neutrons with absorption cross-sections of 9

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5

Mildner, D. F. R., H. Chen, R. G. Downing, and V. A. Sharov. "Developing a focused neutron probe for materials analysis." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1728–29. http://dx.doi.org/10.1017/s0424820100133278.

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Long wavelength neutrons have optical properties analogous to those of photons, and may be focused to produce significantly higher fluxes using the principle of multiple mirror reflection from smooth surfaces at small grazing incident angles. Narrowly focused beams of cold neutrons (with wavelengths greater than 0.4 nm) allow greater spatial resolution for analytical applications than previously available, and will improve the detection limits of neutron absorption measurements (which are dependent on the neutron capture reaction rate) for quantitative analysis. Since the absorption cross sect

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6

Piscitelli, F., A. Khaplanov, A. Devishvili, et al. "Neutron reflectometry on highly absorbing films and its application to 10 B 4 C-based neutron detectors." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, no. 2185 (2016): 20150711. http://dx.doi.org/10.1098/rspa.2015.0711.

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Neutron reflectometry is a powerful tool used for studies of surfaces and interfaces. The absorption in the typical studied materials is neglected and this technique is limited only to the reflectivity measurement. For strongly absorbing nuclei, the absorption can be directly measured by using the neutron-induced fluorescence technique which exploits the prompt particle emission of absorbing isotopes. This technique is emerging from soft matter and biology where highly absorbing nuclei, in very small quantities, are used as a label for buried layers. Nowadays, the importance of absorbing layer

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7

Shishido, Hiroaki, The Dang Vu, Kazuya Aizawa, et al. "Crystalline Orientation of CaF₂ window determined by Neutron Transmission Imaging using a Delay Line Current-Biased Kinetic-Inductance Detector." Journal of Physics: Conference Series 2545, no. 1 (2023): 012020. http://dx.doi.org/10.1088/1742-6596/2545/1/012020.

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Abstract The combination of a high speed two-dimensional neutron detector and an intensive pulsed neutron source provides not only neutron transmission imaging but also information on crystal structures, orientations and constituent elements by analyzing neutron transmission spectra. The delay-line current-biased kinetic-inductance detector (CB-KID) is a two-dimensional superconducting neutron detector with high spatial and temporal resolutions, and multi-hit tolerance. We demonstrated that the delay-line CB-KID with a 10B neutron conversion layer can be applied for neutron transmission measur

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8

Ekhwan Razali, Mohd, Roszilah Hamid, and Yusof Abdullah. "Mechanical Properties and Thermal Neutron Absorption of Heavyweight Hematite Aggregate Concrete for Radiation Shielding." International Journal of Engineering & Technology 8, no. 1.2 (2019): 123–30. http://dx.doi.org/10.14419/ijet.v8i1.2.24883.

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Heavyweight aggregate concrete (HWAC) is the most widely used material as radiation shielding for nuclear reactors. The density of HWAC is increased through the use of heavy natural aggregates such as barites, hematite and magnetite. This study determines the density of HWAC with hematite aggregate replacing granite at 0%, 10%, 20%, 30%, 40% and 50%, its compressive strength and thermal neutron absorption of 1 MeV fast neutrons. The physical properties of hematite which include gradation, specific gravity, water absorption and loose unit weight are determined. The chemical composition of hemat

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9

Laureau, Axel, Max Begue, Vincent Lamirand, Elsa Merle, and Oskari Pakari. "Fast simulation of neutron noise using the Transient Fission Matrix approach and validation on the CROCUS reactor." EPJ Web of Conferences 302 (2024): 08002. http://dx.doi.org/10.1051/epjconf/202430208002.

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This article presents the development of a neutron noise calculation technique with a reduced calculation time based on the TFM (Transient Fission Matrix) approach. The latter contains different information such as the system transfer function (fission and absorption probability density functions and corresponding neutron multiplicity) of prompt and delayed neutrons, and the corresponding propagation time. This information is used to reconstruct neutron showers based on precursor decays up to the shower disappearance by absorption, leakage or delayed neutron precursor creation. Then pseudo-det

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10

Volz, H. M., S. C. Vogel, C. T. Necker, et al. "Rietveld texture analysis by neutron diffraction of highly absorbing materials." Powder Diffraction 21, no. 2 (2006): 114–17. http://dx.doi.org/10.1154/1.2204058.

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We discuss the impact of strong absorption for thermal neutrons on data analysis and compare absorption corrections in the GSAS and MAUD Rietveld codes for texture and structural parameter refinement. Diffraction data were collected on the neutron powder diffractometer HIPPO at LANSCE from dysprosium and erbium, which are moderate-to-strong absorbers for thermal neutrons with absorption cross sections of 159 barns for Er and 994 barns for Dy at λ=1.8 Å. Both elements have hexagonal-close-packed (hcp) crystal structures, and the samples were various thicknesses of rolled foils. The orientation

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11

Kolevatov, Rodion, Christian Schanzer, and Peter Böni. "Neutron absorption in supermirror coatings." Journal of Neutron Research 20, no. 4 (2019): 127–29. http://dx.doi.org/10.3233/jnr-180088.

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12

Løvhøiden, G., and E. Andersen. "Neutron Absorption in Geological Material." Physica Scripta T32 (January 1, 1990): 228–30. http://dx.doi.org/10.1088/0031-8949/1990/t32/038.

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13

Steinhauser, Georg, Stefan Merz, and Johannes H. Sterba. "Instrumental neutron absorption activation analysis." Journal of Radioanalytical and Nuclear Chemistry 296, no. 1 (2012): 165–68. http://dx.doi.org/10.1007/s10967-012-1925-5.

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14

Macklin, R. L., and C. W. Alexander. "Neutron Absorption Cross Section of236U." Nuclear Science and Engineering 104, no. 3 (1990): 258–70. http://dx.doi.org/10.13182/nse90-a23724.

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15

Lan, Zechen, Yasunobu Arikawa, Yuki Abe, et al. "Development of a Time-Gated Epithermal Neutron Spectrometer for Resonance Absorption Measurements Driven by a High-Intensity Laser." Quantum Beam Science 8, no. 1 (2024): 9. http://dx.doi.org/10.3390/qubs8010009.

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The advance of laser-driven neutron sources (LDNSs) has enabled neutron resonance spectroscopy to be performed with a single shot of a laser. In this study, we describe a detection system of epithermal (∼eV) neutrons especially designed for neutron resonance spectroscopy. A time-gated photomultiplier tube (PMT) with a high cut-off ratio was introduced for epithermal neutron detection in a high-power laser experiment at the Institute of Laser Engineering, Osaka University. We successfully reduced the PMT response to the intense hard X-ray generated as a result of the interaction between laser l

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16

Kamiyama, Takashi, Hirotaka Sato, Naoki Miyamoto, Hirokatsu Iwasa, Yoshiaki Kiyanagi, and Susumu Ikeda. "Energy sliced neutron tomography using neutron resonance absorption spectrometer." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 600, no. 1 (2009): 107–10. http://dx.doi.org/10.1016/j.nima.2008.11.053.

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17

Alvarez-Estrada, Ramon F., and Maria L. Calvo. "Neutron Fibres: Confined Propagation and Focusing of Neutrons in the Micron Range and Residual Stress Analysis." Materials Science Forum 772 (November 2013): 51–56. http://dx.doi.org/10.4028/www.scientific.net/msf.772.51.

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We summarize the confined propagation of thermal neutrons along waveguides with small transverse cross section (neutron fibres). We outline proposals for neutron fibres with transverse sizes from microns (μm) down to tens of nanometers (nm). We summarize experimental implementations by means of polycapillary glass fibres, in the μm scale. Some diffraction experiments on small samples by means of thermal neutron capillary optics are summarized. Such developments (together with absorption techniques) could have possible interest for residual stress analysis, below the mm scale.

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18

Salamatov, Yu A., and E. A. Kravtsov. "Theoretical Study of Neutron Reflection from Thin Films and Layered Nanostructures Containing Highly Absorbing Gadolinium and Boron Isotopes." Поверхность. Рентгеновские, синхротронные и нейтронные исследования, no. 8 (August 1, 2023): 32–39. http://dx.doi.org/10.31857/s1028096023080125.

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The application of the method of phase-amplitude functions to the calculation of neutron propagation processes in layered media containing highly absorbing elements is described. This method allows us to simultaneously calculate the reflection, transmission and absorption coefficients of neutrons. It requires less computing resources than the other algorithms. A generalization of the method to matrix equations used in polarized neutron reflectometry is also presented. Examples of calculations of various characteristics of neutron propagation for layered resonator-type systems with a potential

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19

Aleksenskii, Aleksander, Markus Bleuel, Alexei Bosak, et al. "Clustering of Diamond Nanoparticles, Fluorination and Efficiency of Slow Neutron Reflectors." Nanomaterials 11, no. 8 (2021): 1945. http://dx.doi.org/10.3390/nano11081945.

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Neutrons can be an instrument or an object in many fields of research. Major efforts all over the world are devoted to improving the intensity of neutron sources and the efficiency of neutron delivery for experimental installations. In this context, neutron reflectors play a key role because they allow significant improvement of both economy and efficiency. For slow neutrons, Detonation NanoDiamond (DND) powders provide exceptionally good reflecting performance due to the combination of enhanced coherent scattering and low neutron absorption. The enhancement is at maximum when the nanoparticle

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20

Bilalodin, A. Haryadi, Sehah, Zusfahair, Y. Sardjono, and R. Tursinah. "Microdosimetry test on double layer beam shaping assembly neutron beam as a boron neutron capture therapy neutron source using PHITS code." Nuclear Physics and Atomic Energy 25, no. 4 (2024): 388–93. https://doi.org/10.15407/jnpae2024.04.388.

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A microdosimetry test on a double layer beam shaping assembly (DLBSA) neutron beam has been carried out using the particle and heavy ion transport code system (PHITS). The test aims to understand the mechanism of interactions between neutrons and microcells and to determine the linear energy transfer (LET) and the relative biological effectiveness (RBE) values of the DLBSA neutron beam. The test was carried out by interacting a neutron beam with microcells containing 10B using a boron concentration of 70 ppm. The neutron source used comes from a 30 MeV cyclotron-based DLBSA. The simulation res

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21

Brokmeier, H. G. "Neutron Diffraction Texture Analysis of Multi-Phase Systems." Textures and Microstructures 10, no. 4 (1989): 325–46. http://dx.doi.org/10.1155/tsm.10.325.

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Neutron diffraction methods for texture analysis are closely parallel to well-known X-ray diffraction techniques. The chief advantage of neutron diffraction over X-ray diffraction, however, arises from the fact that the interaction of neutrons with matter is relatively weak, and consequently the penetration depth of neutrons is 102–103 times larger than that of X-rays. Hence neutron diffraction is an efficient tool for measuring textures in multi-phase systems. Based on the high transmission of a neutron beam the effect of anisotropic absorption in multi-phase materials can be neglected in mos

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22

Mehrnejad, R. "Improving Neutron Shielding Capacities of Datolite and Galena by Boron Carbide Additive for Nuclear Reactor Biological Shielding." Journal of Physical Chemistry & Biophysics 9, no. 2 (2019): 01–04. https://doi.org/10.5281/zenodo.14848169.

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Biological shielding of nuclear reactor is an important interest and diminishing the intricacy and cost of theseinstallations is important interest. In this paper, we used Datolite and Galena minerals and boron carbide for nuclear reactor shielding aim. Datolite and Galena minerals that exist in many parts of world were used in the concrete mix design. Boron carbide is an important material for neutron absorption processes. The cross section in matter and neutron capture is utilizable causes to explain neutron shielding characteristics of samples. Neutron cross section simulations of samples h

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23

Thiyagarajan, P., R. K. Crawford, and D. F. R. Mildner. "Neutron Transmission of a Single-Crystal MgO Filter." Journal of Applied Crystallography 31, no. 6 (1998): 841–44. http://dx.doi.org/10.1107/s0021889898005858.

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The neutron transmission probability through a single-crystal MgO filter has been measured at both liquid-nitrogen (77 K) and room (300 K) temperatures, as a function of wavelength, using a pulsed neutron source. The data show that a cooled MgO filter is superior to room-temperature sapphire for both thermal and cold neutrons, principally because the absorption probability is reduced by a factor of three at long wavelengths.

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24

Cousin, Fabrice, and Alexis Chennevière. "Neutron reflectivity for soft matter." EPJ Web of Conferences 188 (2018): 04001. http://dx.doi.org/10.1051/epjconf/201818804001.

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Specular neutron reflectivity is a technique enabling the measurement of coherent neutron scattering length density profile perpendicular to the plane of a surface or interface, and thereby the profile of chemical composition. The characteristic sizes that are probed range from around 5Å up 5000 Å. It is a scattering technique that averages information over the entire surface and it is therefore not possible to obtain information on correlations in the plane of the interface. The specific properties of neutrons (possibility of tuning the contrast by isotopic substitution, negligible absorption

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25

Nikitenko, Yu V. "Neutron Absorption in a Layered Structure." Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques 16, no. 4 (2022): 533–36. http://dx.doi.org/10.1134/s1027451022040139.

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26

Smith, Alan B. "The Neutron Spherical Optical Model Absorption." Annals of Nuclear Energy 35, no. 5 (2008): 890–903. http://dx.doi.org/10.1016/j.anucene.2007.09.004.

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Kaloyerou, P. N., and H. R. Brown. "On neutron interferometer partial absorption experiments." Physica B: Condensed Matter 176, no. 1-2 (1992): 78–92. http://dx.doi.org/10.1016/0921-4526(92)90600-w.

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28

Johnson, Elijah, and Larry Robinson. "Neutron multiple scattering and absorption factors." Review of Scientific Instruments 60, no. 11 (1989): 3447–51. http://dx.doi.org/10.1063/1.1141076.

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Skobelev, V. V. "Absorption of neutrinos in neutron stars." Astrophysics 31, no. 1 (1990): 502–5. http://dx.doi.org/10.1007/bf01004398.

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30

Potashev, S. I., A. A. Afonin, Y. M. Burmistrov, et al. "Multiwire Position-Sensitive Neutron Detector with Two Layers of Boron-10." Poverhnostʹ. Rentgenovskie, sinhrotronnye i nejtronnye issledovaniâ, no. 8 (December 25, 2024): 36–41. https://doi.org/10.31857/s1028096024080058.

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Multiwire position-sensitive neutron detector with two layers of boron-10 was developed to detect both thermal and fast neutrons. Sensitive dimensions of two coordinate neutron detector are 50 × 50 mm. New detector characteristics are compared with ones of 100 × 100 mm detector built earlier which we used in neutron flux spatial distribution measurement. Plane-parallel design of 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 boron-10 layers of 0.

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31

Begun, S. V., N. R. Dzysiuk, I. M. Kadenko, V. K. Maidanyuk, and G. I. Primenko. "Cross sections of (n, p) nuclear reactions on zirconium isotopes." Nuclear Physics and Atomic Energy 8, no. 3 (2007): 42–46. https://doi.org/10.15407/jnpae2007.03.042.

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Cross sections of nuclear reactions 92Zr(n, p)92Y and 94Zr(n, p)94Y were measured in the neutron energy range 13.56 ÷ 14.53 MeV. Measurements have been carried out by neutron activation method. The samples in the form of foils of natural zirconium have been irradiated by DT- neutrons. Instrumental gamma-spectra of activation products have been measured by spectrometer with HPGe detector. The corrections on the instability of neutron flux, real geometry of the experiment, the effect of true coincidence summing of gamma-quanta during activation products spectra measurements and on effect of abso

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32

Kulikov, Gennady G., Anatoly N. Shmelev, Vladimir A. Apse, and Evgeny G. Kulikov. "On a significant slowing-down of the kinetics of fast transient processes in a fast reactor." Nuclear Energy and Technology 6, no. 4 (2020): 295–98. http://dx.doi.org/10.3897/nucet.6.60379.

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The kinetics of nuclear reactors is determined by the average neutron lifetime. When the inserted reactivity is more than the effective delayed neutron fraction, the reactor kinetics becomes very rapid. It is possible to slow down the fast reactor kinetics by increasing the neutron lifetime. The authors consider the possibility of using the lead isotope, 208Pb, as a neutron reflector with specific properties in a lead-cooled fast reactor. To analyze the emerging effects in a reactor of this type, a point kinetics model was selected, which takes into account neutrons returning from the 208Pb re

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Yanchukovsky, Valery, and Vasiliy Kuz'menko. "Method of automatic correction of neutron monitor data for precipitation in the form of snow in real time." Solnechno-Zemnaya Fizika 7, no. 3 (2021): 120–26. http://dx.doi.org/10.12737/szf-73202108.

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We have carried out an experimental study of the influence of precipitation in the form of snow on measurements of the neutron flux intensity near Earth's surface. We have examined the state of the snow cover and its density, and found out that the density depends on the depth of the snow cover. Using the experimental results, we estimate the neutron absorption path in the snow. Changes in snow cover by 10–12 cm at a depth of 80 cm are shown to cause variations in the monitor count rate with an amplitude of 0.9 %. At the snow depth of 80 cm, the neutron monitor count rate decreases by about 8

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Yanchukovsky, Valery, and Vasiliy Kuz'menko. "Method of automatic correction of neutron monitor data for precipitation in the form of snow in real time." Solar-Terrestrial Physics 7, no. 3 (2021): 114–20. http://dx.doi.org/10.12737/stp-73202108.

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We have carried out an experimental study of the influence of precipitation in the form of snow on measurements of the neutron flux intensity near Earth's surface. We have examined the state of the snow cover and its density, and found out that the density depends on the depth of the snow cover. Using the experimental results, we estimate the neutron absorption path in the snow. Changes in snow cover by 10–12 cm at a depth of 80 cm are shown to cause variations in the monitor count rate with an amplitude of 0.9 %. At the snow depth of 80 cm, the neutron monitor count rate decreases by about 8

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35

Pape, Sebastian, Marcos Fernández García, Michael Moll, and Moritz Wiehe. "Study of Neutron-, Proton-, and Gamma-Irradiated Silicon Detectors Using the Two-Photon Absorption–Transient Current Technique." Sensors 24, no. 16 (2024): 5443. http://dx.doi.org/10.3390/s24165443.

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The Two-Photon Absorption–Transient Current Technique (TPA-TCT) is a device characterisation technique that enables three-dimensional spatial resolution. Laser light in the quadratic absorption regime is employed to generate excess charge carriers only in a small volume around the focal spot. The drift of the excess charge carriers is studied to obtain information about the device under test. Neutron-, proton-, and gamma-irradiated p-type pad silicon detectors up to equivalent fluences of about 7 × 1015 neq/cm2 and a dose of 186 Mrad are investigated to study irradiation-induced effects on the

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36

Feldmann, K. "Texture Investigations by Neutron Time-of-Flight Diffraction." Textures and Microstructures 10, no. 4 (1989): 309–23. http://dx.doi.org/10.1155/tsm.10.309.

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For the majority of isotopes the thermal neutron absorption cross section is two or more orders lower than that for X-rays. This makes neutron diffraction well-suited for bulk texture investigations. Some characteristics of neutron diffraction are discussed. The principles of neutron time-of-flight diffraction are described. The pole figure determination by means of TOF technique is considered. The main parameters of the present Dubna texture facility are given. Further developments of the experimental technique are considered. The application of the TOF technique for inverse pole figure measu

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Singh, Vishvanath, Nagappa Badiger, and Rene Vega-Carrillo. "Studies on neutron and photon kerma parameters for human body organs." Nuclear Technology and Radiation Protection 31, no. 2 (2016): 128–34. http://dx.doi.org/10.2298/ntrp1602128s.

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A study on neutron kerma factors and photon air-kerma for human organs is presented for neutron energy range 2.53?10-8 MeV to 29 MeV and photon energy range 1 keV to 20 MeV. The human organs water equivalence for photon and neutron, is also presented. The ratio of the mass-energy absorption coefficients of human organs to water was found constant and unity above 100 keV, whereas there was a large difference for energies below 100 keV. The neutron kerma factors of human organs and water are found of same order of magnitude whereas differs for air. The neutron kerma factors of human organs and t

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38

Tremsin, A. S., J. B. McPhate, J. V. Vallerga, et al. "High Resolution Neutron Resonance Absorption Imaging at a Pulsed Neutron Beamline." IEEE Transactions on Nuclear Science 59, no. 6 (2012): 3272–77. http://dx.doi.org/10.1109/tns.2012.2215627.

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Kosarev, V. F., S. V. Klinkov, V. S. Shikalov, and A. E. Chesnokov. "A Study of the Neutron Absorbing Properties of Al + B4C and Al + B Coatings Formed by Cold Gas-Dynamic Spraying." Физика металлов и металловедение 124, no. 3 (2023): 323–29. http://dx.doi.org/10.31857/s0015323022600629.

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For the first time, the efficiency of thermal neutron absorption by composite coatings deposited by cold gas-dynamic spraying from mechanically activated mixtures of Al + B4C and Al + B powders on the surface of stainless steel samples has been compared with a reference standard. The comparison with the standard, which was boron steel plates, showed that the resulting coatings are somewhat inferior in terms of neutron absorption efficiency. To estimate the required thickness of the coatings, an approach based on the processing of the experimental data obtained is proposed that, in particular,

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Takano, Hidekazu, Yanlin Wu, Tetsuo Samoto, et al. "Demonstration of Neutron Phase Imaging Based on Talbot–Lau Interferometer at Compact Neutron Source RANS." Quantum Beam Science 6, no. 2 (2022): 22. http://dx.doi.org/10.3390/qubs6020022.

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Neutron imaging based on a compact Talbot–Lau interferometer was demonstrated using the RIKEN accelerator-driven compact neutron source (RANS). A compact Talbot–Lau interferometer consisting of gadolinium absorption gratings and a silicon phase grating was constructed and connected to the RANS. Because of pulsed thermal neutrons from the RANS and a position-sensitive detector equipped with time-of-flight (TOF) analysis, moiré interference patterns generated using the interferometer were extracted at a TOF range around the design wavelength (2.37 Å) optimal for the interferometer. Differential

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Shmelev, A., V. Apse, G. Kulikov, and E. Kulikov. "ADVANTAGES OF THE FAST REACTOR CORE SURROUNDED BY THE PHYSICALLY THICK NEUTRON REFLECTOR MADE OF LEAD-208." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2020, no. 4 (2020): 46–59. http://dx.doi.org/10.55176/2414-1038-2020-4-46-59.

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The paper analyzes the effects produced by the use of lead isotope 208Pb instead of natural lead as a coolant and neutron reflector on neutron-physical parameters of fast reactor. A possibility is demonstrated to reach substantial (up to three orders of magnitude) elongation of mean prompt neutron lifetime in the fast reactor with physically thick 208Pb-reflector. So large elongation of prompt neutron lifetime opens an opportunity for remarkable enhancement of the reactor safety under conditions of reactivity-induced accidents. Numerical analyses have shown that it became possible to form high

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42

Mehrnejad, Rasoul, Abdulhalik Karabulut, Turgay Korkut, and Bunyamin Aygun. "Improving Neutron Shielding Capacities of Galena and Barite Hybrid Fiber Heavyweight Aggregate Concrete for Nuclear Reactor." International Journal on Applied Physics and Engineering 2 (October 5, 2023): 128–36. http://dx.doi.org/10.37394/232030.2023.2.12.

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Biological shielding of nuclear reactors is an important interest and diminishing the intricacy and cost of these installations is an important interest. In this paper, we used galena minerals and barite for the production of a hybrid fiber heavyweight aggregate concrete. Galena minerals that exist in many parts of Iran were used in the concrete mix design. Barite is an important chemical element for neutron absorption processes. The cross-section in matter and neutron capture is a utilizable cause to explain the neutron shielding characteristics of samples. Neutron cross-section measurements

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43

Kulikov, Gennady G., Anatoly N. Shmelev, Vladimir A. Apse, and Evgeny G. Kulikov. "On a significant slowing-down of the kinetics of fast transient processes in a fast reactor." Nuclear Energy and Technology 6, no. (4) (2020): 295–98. https://doi.org/10.3897/nucet.6.60379.

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The kinetics of nuclear reactors is determined by the average neutron lifetime. When the inserted reactivity is more than the effective delayed neutron fraction, the reactor kinetics becomes very rapid. It is possible to slow down the fast reactor kinetics by increasing the neutron lifetime. The authors consider the possibility of using the lead isotope, <sup>208</sup>Pb, as a neutron reflector with specific properties in a lead-cooled fast reactor. To analyze the emerging effects in a reactor of this type, a point kinetics model was selected, which takes into account neutrons returning from t

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Chen, Junyang, Ulrich Rücker, Jörg Voigt, et al. "Thermal moderator-reflector design of the 24 Hz target station for the High Brilliance Neutron Source." EPJ Web of Conferences 286 (2023): 02005. http://dx.doi.org/10.1051/epjconf/202328602005.

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The High Brilliance Neutron Source (HBS) project develops a high current accelerator driven neutron source (HiCANS), aiming to substitute existing neutron research reactors, that reach the end of life. This study focuses on the thermal neutron moderator design for a low frequency, long pulse target station of HBS. We investigate the neutronic characteristics of the D2O+H2O mixture moderator material using the Monte Carlo particle transport code PHITS. Our findings show that, compared to D2O with lower neutron absorption, confinement of H2O is the dominant factor in achieving a high neutron flu

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Lund, Kelsey A., Payel Mukhopadhyay, Jonah M. Miller, and G. C. McLaughlin. "Angle-dependent in Situ Fast Flavor Transformations in Post-neutron-star-merger Disks." Astrophysical Journal Letters 985, no. 1 (2025): L9. https://doi.org/10.3847/2041-8213/add0a7.

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Abstract The remnant black hole–accretion disk system resulting from binary neutron star mergers has proven to be a promising site for synthesizing the heaviest elements via rapid neutron capture (r-process). A critical factor in determining the full r-process pattern in these environments is the neutron richness of the ejecta, which is strongly influenced by neutrino interactions. One key ingredient shaping these interactions is fast neutrino flavor conversions (FFCs), which arise due to angular crossings in neutrino distributions and occur on nanosecond timescales. We present the first three

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Désert, Sylvain, Tobias Panzner, and Patrice Permingeat. "Focusing neutrons with a combination of parabolic and elliptical supermirrors." Journal of Applied Crystallography 46, no. 1 (2012): 35–42. http://dx.doi.org/10.1107/s0021889812047346.

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Cold-neutron focusing is a challenge with regard to improving the flux at the sample, decreasing measurement time and/or gaining statistical reliability. Several techniques are used for neutron focusing, such as simple or multi-beam collimation, refractive or magnetic lenses, and focusing mirrors. In this work, a new device for focusing neutrons using a combination of a parabolic supermirror, an asymmetric slit system and an elliptical supermirror is presented. The aim of this focusing system is to improve the neutron flux at the sample compared to other techniques without either achromatism o

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Just, O., S. Goriely, H.-Th Janka, S. Nagataki, and A. Bauswein. "Neutrino absorption and other physics dependencies in neutrino-cooled black hole accretion discs." Monthly Notices of the Royal Astronomical Society 509, no. 1 (2021): 1377–412. http://dx.doi.org/10.1093/mnras/stab2861.

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ABSTRACT Black hole (BH) accretion discs formed in compact-object mergers or collapsars may be major sites of the rapid-neutron-capture (r-)process, but the conditions determining the electron fraction (Ye) remain uncertain given the complexity of neutrino transfer and angular-momentum transport. After discussing relevant weak-interaction regimes, we study the role of neutrino absorption for shaping Ye using an extensive set of simulations performed with two-moment neutrino transport and again without neutrino absorption. We vary the torus mass, BH mass and spin, and examine the impact of rest

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Variale, Vincenzo, and Boris Skarbo. "Neutron imager with micro channel plates (MCP) in electrostatic mirror configuration: Neutron beam test." International Journal of Modern Physics: Conference Series 50 (January 2020): 2060018. http://dx.doi.org/10.1142/s2010194520600186.

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A recent advancement in a new high transparency monitor device based on Micro Channel Plate (MCP) has been proposed for monitoring flux and beam spatial profiles of neutrons. It consisted of the assembly of a very thin aluminum (Al) foil with a 6Li deposit placed along the beam and a MCP equipped with a phosphor screen readout viewed by a CCD camera outside the beam line. The peculiar feature of this device is that it uses an electrostatic mirror to minimize the perturbation of the neutron beam, i.e. absorption and scattering. It can be used at existing time-of-flight facilities, in particular

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Ljubenov, Vladan, and Miodrag Milosevic. "Determination of the neutron flux in the reactor zones with the strong neutron absorption and leakage." Serbian Journal of Electrical Engineering 1, no. 3 (2004): 99–112. http://dx.doi.org/10.2298/sjee0403099l.

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The procedures for the numerical and experimental determination of the neutron flux in the zones with the strong neutron absorption and leakage are described in this paper. Numerical procedure is based on the application of the SCALE-4.4a code system where the Dancoff factors are determined by the VEGA2DAN code. Two main parts of the experimental methodology are measurement of the activity of irradiated foils and determination of the averaged neutron absorption cross-section in the foils by the SCALE-4.4a calculation procedure. The proposed procedures have been applied for the determination of

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Platt, Simon P., Shaun August, Michael MacLeod, Michael J. Anderson, David Cheneler, and Stephen D. Monk. "Thermal Neutron Absorption in Printed Circuit Boards." IEEE Transactions on Nuclear Science 68, no. 4 (2021): 463–69. http://dx.doi.org/10.1109/tns.2021.3060864.

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