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Lychagin E, Dubois M, Nesvizhevsky V. Powders of Diamond Nanoparticles as a Promising Material for Reflectors of Very Cold and Cold Neutrons. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:387. [PMID: 38392760 PMCID: PMC10892265 DOI: 10.3390/nano14040387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/18/2024] [Accepted: 02/10/2024] [Indexed: 02/24/2024]
Abstract
More than 15 years ago, the study of nanodiamond (ND) powders as a material for designing reflectors of very cold neutrons (VCNs) and cold neutrons (CNs) began. Such reflectors can significantly increase the efficiency of using such neutrons and expand the scope of their application for solving applied and fundamental problems. This review considers the principle of operation of VCN and CN reflectors based on ND powders and their advantages. Information is presented on the performed experimental and theoretical studies of the effect of the size, structure, and composition of NDs on the efficiency of reflectors. Methods of chemical and mechanical treatments of powders in order to modify their chemical composition and structure are discussed. The aim is to avoid, or at least to decrease, the neutron inelastic scatterers and absorbers (mainly hydrogen atoms but also metallic impurities and nitrogen) as well as to enhance coherent elastic scattering (to destroy ND clusters and sp2 carbon shells on the ND surface that result from the preparation of NDs). Issues requiring further study are identified. They include deeper purification of NDs from impurities that can be activated in high radiation fluxes, the stability of NDs in high radiation fluxes, and upscaling methods for producing larger quantities of ND powders. Possible ways of solving these problems are proposed.
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Affiliation(s)
- Egor Lychagin
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Marc Dubois
- Clermont Auvergne INP, Université Clermont Auvergne, 63178 Aubière, France
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Maaza M, Pardo B, Hamidi D, Akbari M, Morad R, Henini M, Gibaud A. On the trapping of neutrons in Fabry–Pérot nano-structures and potential applications for cold neutron lifetime Investigations. JOURNAL OF NEUTRON RESEARCH 2023. [DOI: 10.3233/jnr-220015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Correlated to the neutron total reflection phenomenon is the so-called frustrated total reflection, also known as neutron channeling, observed with both thermal and cold neutrons. Within this contribution, such a phenomenon is validated in various additional distinctive Fabry–Pérot nano-resonating configurations; namely in: (i) dual reflection and transmission neutron Fabry–Pérot nano-resonator (Ni/V/Ni/Si substrate), (ii) isotope-based neutron Fabry–Pérot nano-resonator (58Ni/62Ni/58Ni/Silicon substrate), and (iii) multilayered neutron Fabry–Pérot nano-resonator of 8 superposed (B4C/Ti/B4C) single nano-resonators. While such Fabry–Pérot nano-resonators allow effective neutron trapping, the precision of the trapping time of free neutrons in such nano-resonators is governed by the Heisenberg uncertainty and hence offers, a priori, an additional attractive precise approach for potential lifetime investigations. Depending on the configuration of the Fabry–Pérot nano-resonators and the available cold neutron beam, the trapping time is found to be within the temporal regime of 3 to 19 ps. While the main intention of this contribution is to validate the possibility of trapping cold neutrons in nano-structured Fabry–Pérot resonators with a picosecond precision in various configurations, it is hoped that these preliminary results will attract the interest of the neutron lifetime community specifically and the neutron scattering community in general. The potential integration of such trapping method into the bottle or beam methods would elucidate the origin of the difference in neutron lifetime between the two approaches.
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Affiliation(s)
- M. Maaza
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, PO Box 392, Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba Laboratories for Accelerators Based Sciences, iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province, South Africa
| | - B. Pardo
- Institut d’Optique Théorique & Appliquée, Université Paris-Saclay, France
| | - D. Hamidi
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, PO Box 392, Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba Laboratories for Accelerators Based Sciences, iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province, South Africa
| | - M. Akbari
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, PO Box 392, Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba Laboratories for Accelerators Based Sciences, iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province, South Africa
| | - R. Morad
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, PO Box 392, Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba Laboratories for Accelerators Based Sciences, iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province, South Africa
| | - M. Henini
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, PO Box 392, Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba Laboratories for Accelerators Based Sciences, iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province, South Africa
- Physics Department, University of Nottingham, Nottingham, UK
| | - A. Gibaud
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, PO Box 392, Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba Laboratories for Accelerators Based Sciences, iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province, South Africa
- IMMM, UMR 6283 CNRS, Université of Le Maine, Bd O. Messiaen, 72085 Le Mans cedex 09, Le Mans, France
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Raventós M, Lehmann EH, Boin M, Morgano M, Hovind J, Harti R, Valsecchi J, Kaestner A, Carminati C, Boillat P, Trtik P, Schmid F, Siegwart M, Mannes D, Strobl M, Grünzweig C. A Monte Carlo approach for scattering correction towards quantitative neutron imaging of polycrystals. J Appl Crystallogr 2018; 51:386-394. [PMID: 29657567 PMCID: PMC5884388 DOI: 10.1107/s1600576718001607] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 01/26/2018] [Indexed: 11/11/2022] Open
Abstract
The development of neutron imaging from a qualitative inspection tool towards a quantitative technique in materials science has increased the requirements for accuracy significantly. Quantifying the thickness or the density of polycrystalline samples with high accuracy using neutron imaging has two main problems: (i) the scattering from the sample creates artefacts on the image and (ii) there is a lack of specific reference attenuation coefficients. This work presents experimental and simulation results to explain and approach these problems. Firstly, a series of neutron radiography and tomography experiments of iron, copper and vanadium are performed and serve as a reference. These materials were selected because they attenuate neutrons mainly through coherent (Fe and Cu) and incoherent (V) scattering. Secondly, an ad hoc Monte Carlo model was developed, based on beamline, sample and detector parameters, in order to simulate experiments, understand the physics involved and interpret the experimental data. The model, developed in the McStas framework, uses a priori information about the sample geometry and crystalline structure, as well as beamline settings, such as spectrum, geometry and detector type. The validity of the simulations is then verified with experimental results for the two problems that motivated this work: (i) the scattering distribution in transmission imaging and (ii) the calculated attenuation coefficients.
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Affiliation(s)
- M Raventós
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland.,University of Geneva, Geneva, Switzerland
| | - E H Lehmann
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - M Boin
- Helmholtz Zentrum Berlin für Materialien und Energie, Berlin, Germany
| | - M Morgano
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - J Hovind
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - R Harti
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland.,University of Geneva, Geneva, Switzerland
| | - J Valsecchi
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland.,University of Geneva, Geneva, Switzerland
| | - A Kaestner
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - C Carminati
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - P Boillat
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - P Trtik
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - F Schmid
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - M Siegwart
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - D Mannes
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - M Strobl
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
| | - C Grünzweig
- Laboratory for Neutron Scattering and Imaging, Villigen, Switzerland
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Gould FT, Taylor TI, Havens WW, Rustad BM, Melkonian E. Long Wavelength Crystal Spectrometer and the Neutron Absorption Cross Sections of Gold and Boron. NUCL SCI ENG 2017. [DOI: 10.13182/nse60-a25832] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- F. T. Gould
- Columbia University,Chemistry and Physics Departments, New York, Neiv York and Brookhaven National Laboratory, Upton, New York
| | - T. I. Taylor
- Columbia University,Chemistry and Physics Departments, New York, Neiv York and Brookhaven National Laboratory, Upton, New York
| | - W. W. Havens
- Columbia University,Chemistry and Physics Departments, New York, Neiv York and Brookhaven National Laboratory, Upton, New York
| | - B. M. Rustad
- Columbia University,Chemistry and Physics Departments, New York, Neiv York and Brookhaven National Laboratory, Upton, New York
| | - E. Melkonian
- Columbia University,Chemistry and Physics Departments, New York, Neiv York and Brookhaven National Laboratory, Upton, New York
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Malamud F, Santisteban JR, Vicente Alvarez MA, Bolmaro R, Kelleher J, Kabra S, Kockelmann W. Texture analysis with a time-of-flight neutron strain scanner. J Appl Crystallogr 2014. [DOI: 10.1107/s1600576714012710] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A time-of-flight (TOF) neutron strain scanner is a white-beam instrument optimized to measure diffractograms at precise locations within bulky specimens, typically along two perpendicular sample orientations. Here, a method is proposed that exploits the spatial resolution (∼1 mm) provided by such an instrument to determine in a nondestructive manner the crystallographic texture at selected locations within a macroscopic object. The method is based on defining the orientation distribution function (ODF) of the crystallites from several incomplete pole figures, and it has been implemented on ENGIN-X, a neutron strain scanner at the ISIS facility in the UK. This method has been applied to determine the texture at different locations of Al alloy plates welded along the rolling direction and to study a Zr2.5%Nb pressure tube produced for a CANDU nuclear power plant. For benchmarking, the results obtained with this instrument for samples of ferritic steel, copper, Al alloys and Zr alloys have been compared with measurements performed using conventional X-ray diffractometers and more established neutron techniques. For cases where pole figure coverage is incomplete, the use of TOF neutron transmission measurements simultaneously performed on the specimens is proposed as a simple and powerful test to validate the resulting ODF.
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Elandt RB, Shakeri M, Alam MR. Surface gravity-wave lensing. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:023012. [PMID: 25353576 DOI: 10.1103/physreve.89.023012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Indexed: 06/04/2023]
Abstract
Here we show that a nonlinear resonance between oceanic surface waves caused by small seabed features (the so-called Bragg resonance) can be utilized to create the equivalent of lenses and curved mirrors for surface gravity waves. Such gravity wave lenses, which are merely small changes to the seafloor topography and therefore are surface noninvasive, can focus or defocus the energy of incident waves toward or away from any desired focal point. We further show that for a broadband incident wave spectrum (i.e., a wave group composed of a multitude of different-frequency waves), a polychromatic topography (occupying no more than the area required for a monochromatic lens) can achieve a broadband lensing effect. Gravity wave lenses can be utilized to create localized high-energy wave zones (e.g., for wave energy harvesting or creating artificial surf zones) as well as to disperse waves in order to create protected areas (e.g., harbors or areas near important offshore facilities). In reverse, lensing of oceanic waves may be caused by natural seabed features and may explain the frequent appearance of very high amplitude waves in certain bodies of water.
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Affiliation(s)
- Ryan B Elandt
- Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA
| | - Mostafa Shakeri
- Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA
| | - Mohammad-Reza Alam
- Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA
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Borfecchia ELISA, Gianolio DIEGO, Agostini GIOVANNI, Bordiga SILVIA, Lamberti CARLO. Characterization of MOFs. 2. Long and Local Range Order Structural Determination of MOFs by Combining EXAFS and Diffraction Techniques. METAL ORGANIC FRAMEWORKS AS HETEROGENEOUS CATALYSTS 2013. [DOI: 10.1039/9781849737586-00143] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
This chapter provides an elementary introduction to X‐ray and neutron scattering theory, written with a didactic perspective. At the beginning, the scattering process is introduced in a general way and then a differentiation between crystalline samples and amorphous samples is made, leading to the Bragg equation or to the Debye equation and to the Pair Distribution Function (PDF) approach, respectively. Advantages and disadvantages of the use of X‐rays or neutrons for scattering experiments are underlined. The basics of Extended X‐ray Absorption Fine Structure (EXAFS) spectroscopy are also reported. Starting from these basics, five examples have been selected from the recent literature where the concepts described in the first didactic part have been applied to the understanding of the structure of different MOFs materials.
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Affiliation(s)
- ELISA Borfecchia
- Department of Chemistry NIS Centre of Excellence and INSTM Reference Center, Via Giuria 7, University of Turin 10125 Torino Italy
| | - DIEGO Gianolio
- Department of Chemistry NIS Centre of Excellence and INSTM Reference Center, Via Giuria 7, University of Turin 10125 Torino Italy
- Diamond Light Source Ltd Harwell Science and Innovation Campus, Didcot, OX11 0DE United Kingdom
| | - GIOVANNI Agostini
- Department of Chemistry NIS Centre of Excellence and INSTM Reference Center, Via Giuria 7, University of Turin 10125 Torino Italy
| | - SILVIA Bordiga
- Department of Chemistry NIS Centre of Excellence and INSTM Reference Center, Via Giuria 7, University of Turin 10125 Torino Italy
| | - CARLO Lamberti
- Department of Chemistry NIS Centre of Excellence and INSTM Reference Center, Via Giuria 7, University of Turin 10125 Torino Italy
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Müller TO. Threshold law for attractive inverse-cube interactions. PHYSICAL REVIEW LETTERS 2013; 110:260401. [PMID: 23848847 DOI: 10.1103/physrevlett.110.260401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Indexed: 06/02/2023]
Abstract
For scattering by potentials with attractive inverse-cube (-C3/r3) tails, the threshold law for elastic collisions is presented. The expansion of the scattering phase shift contains all terms up to and including O(k2) and only relies on the value of the threshold quantum number's remainder Δ∈[0,1), which accounts for short-range deviations of the full potential from the pure -C3/r3 form. In contrast to previous approaches, the threshold law presented provides a connection to the regular solution at zero energy as well as to the position of a weakly bound s-wave state.
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Affiliation(s)
- Tim-Oliver Müller
- Physik Department, Technische Universität München, D-85747 Garching, Germany.
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Dawidowski J, Granada JR, Santisteban JR, Cantargi F, Palomino LAR. Neutron Scattering Lengths and Cross Sections. EXPERIMENTAL METHODS IN THE PHYSICAL SCIENCES 2013. [DOI: 10.1016/b978-0-12-398374-9.09989-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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Butler LG, Lehmann EH. Edge Enhancement in Cold Neutron Imaging: A Comparison of Experiments at Edges and Interfaces with Ray-tracing based on Refraction and Reflection. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.phpro.2013.03.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mason TE, Gawne TJ, Nagler SE, Nestor MB, Carpenter JM. The early development of neutron diffraction: science in the wings of the Manhattan Project. Acta Crystallogr A 2012; 69:37-44. [PMID: 23250059 PMCID: PMC3526866 DOI: 10.1107/s0108767312036021] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 08/16/2012] [Indexed: 11/30/2022] Open
Abstract
Early neutron diffraction experiments performed in 1944 using the first nuclear reactors are described. Although neutron diffraction was first observed using radioactive decay sources shortly after the discovery of the neutron, it was only with the availability of higher intensity neutron beams from the first nuclear reactors, constructed as part of the Manhattan Project, that systematic investigation of Bragg scattering became possible. Remarkably, at a time when the war effort was singularly focused on the development of the atomic bomb, groups working at Oak Ridge and Chicago carried out key measurements and recognized the future utility of neutron diffraction quite independent of its contributions to the measurement of nuclear cross sections. Ernest O. Wollan, Lyle B. Borst and Walter H. Zinn were all able to observe neutron diffraction in 1944 using the X-10 graphite reactor and the CP-3 heavy water reactor. Subsequent work by Wollan and Clifford G. Shull, who joined Wollan’s group at Oak Ridge in 1946, laid the foundations for widespread application of neutron diffraction as an important research tool.
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Affiliation(s)
- T E Mason
- Oak Ridge National Laboratory, TN 37831, USA.
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14
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Alam MR. Broadband cloaking in stratified seas. PHYSICAL REVIEW LETTERS 2012; 108:084502. [PMID: 22463535 DOI: 10.1103/physrevlett.108.084502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Indexed: 05/31/2023]
Abstract
Here we show that floating objects in stratified fluids can be cloaked against broadband incident waves by properly architecting the bottom corrugations. The presented invisibility cloaking of gravity waves is achieved utilizing a nonlinear resonance concept that occurs between surface and internal waves mediated by the bottom topography. Our cloak bends wave rays from the surface into the body of the fluid. Wave rays then pass underneath the floating object and may be recovered back to the free surface at the downstream bearing no trace of diffraction or scattering. The cloak is the proper architecture of bottom corrugations only, and hence is surface noninvasive. The presented scheme is a nonlinear alternative to the transformation-based cloaking, but in the context of dispersive waves.
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Affiliation(s)
- Mohammad-Reza Alam
- Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA
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Nesvizhevsky V, Cubitt R, Lychagin E, Muzychka A, Nekhaev G, Pignol G, Protasov K, Strelkov A. Application of Diamond Nanoparticles in Low-Energy Neutron Physics. MATERIALS 2010. [PMCID: PMC5445881 DOI: 10.3390/ma3031768] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Diamond, with its exceptionally high optical nuclear potential and low absorption cross-section, is a unique material for a series of applications in VCN (very cold neutron) physics and techniques. In particular, powder of diamond nanoparticles provides the best reflector for neutrons in the complete VCN energy range. It allowed also the first observation of quasi-specular reflection of cold neutrons (CN) from disordered medium. Effective critical velocity for such a quasi-specular reflection is higher than that for the best super-mirror. Nano-diamonds survive in high radiation fluxes; therefore they could be used, under certain conditions, in the vicinity of intense neutron sources.
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Affiliation(s)
- Valery Nesvizhevsky
- Institut Laue-Langevin, 6 rue Jules Horowitz, Grenoble, F-38046, France; E-Mail: (R.C.)
- Research Institute of Materials Technology, Presnenskii val, 21/18, Moscow, 123557, Russia
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +33-476207795; Fax: +33-476207777
| | - Robert Cubitt
- Institut Laue-Langevin, 6 rue Jules Horowitz, Grenoble, F-38046, France; E-Mail: (R.C.)
| | - Egor Lychagin
- Joint Institute for Nuclear Research, 6 Joliot Curie, Dubna, Moscow reg., 141980, Russia; E-Mails: (E.L.); (A.M.); (A.S.)
- Research Institute of Materials Technology, Presnenskii val, 21/18, Moscow, 123557, Russia
| | - Alexei Muzychka
- Joint Institute for Nuclear Research, 6 Joliot Curie, Dubna, Moscow reg., 141980, Russia; E-Mails: (E.L.); (A.M.); (A.S.)
- Research Institute of Materials Technology, Presnenskii val, 21/18, Moscow, 123557, Russia
| | - Grigory Nekhaev
- Joint Institute for Nuclear Research, 6 Joliot Curie, Dubna, Moscow reg., 141980, Russia; E-Mails: (E.L.); (A.M.); (A.S.)
- Research Institute of Materials Technology, Presnenskii val, 21/18, Moscow, 123557, Russia
| | - Guillaume Pignol
- Laboratoire de Physique Subatomique et de Cosmologie, UJF Grenoble 1, CNRS/IN2P3, Grenoble INP, 53 rue des Martyrs, Grenoble, F-38026, France; E-Mails: (G.P.); (K.P.)
| | - Konstantin Protasov
- Laboratoire de Physique Subatomique et de Cosmologie, UJF Grenoble 1, CNRS/IN2P3, Grenoble INP, 53 rue des Martyrs, Grenoble, F-38026, France; E-Mails: (G.P.); (K.P.)
| | - Alexander Strelkov
- Joint Institute for Nuclear Research, 6 Joliot Curie, Dubna, Moscow reg., 141980, Russia; E-Mails: (E.L.); (A.M.); (A.S.)
- Research Institute of Materials Technology, Presnenskii val, 21/18, Moscow, 123557, Russia
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Altarev I, Atchison F, Daum M, Frei A, Gutsmiedl E, Hampel G, Hartmann FJ, Heil W, Knecht A, Kratz JV, Lauer T, Meier M, Paul S, Sobolev Y, Wiehl N. Direct experimental verification of neutron acceleration by the material optical potential of solid 2H2. PHYSICAL REVIEW LETTERS 2008; 100:014801. [PMID: 18232776 DOI: 10.1103/physrevlett.100.014801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Indexed: 05/25/2023]
Abstract
We have measured the acceleration of neutrons by the material optical potential of solid 2H2. Using a gravitational spectrometer, we find a minimal kinetic energy Ec = (99+/-7) neV of neutrons from a superthermal ultracold neutron (UCN) source with solid 2H2 as an UCN converter. The result is in excellent agreement with theoretical predictions, Ec = 106 neV.
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Affiliation(s)
- I Altarev
- Physik-Department, Technische Universität München, Munich, Germany
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Atchison F, Blau B, Bodek K, van den Brandt B, Bryś T, Daum M, Fierlinger P, Frei A, Geltenbort P, Hautle P, Henneck R, Heule S, Holley A, Kasprzak M, Kirch K, Knecht A, Konter JA, Kuźniak M, Liu CY, Morris CL, Pichlmaier A, Plonka C, Pokotilovski Y, Saunders A, Shin Y, Tortorella D, Wohlmuther M, Young AR, Zejma J, Zsigmond G. Cold neutron energy dependent production of ultracold neutrons in solid deuterium. PHYSICAL REVIEW LETTERS 2007; 99:262502. [PMID: 18233572 DOI: 10.1103/physrevlett.99.262502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Indexed: 05/25/2023]
Abstract
A measurement of the production of ultracold neutrons from velocity-selected cold neutrons on gaseous and solid deuterium targets is reported. The expected energy dependence for two-particle collisions with well defined neutron and Maxwell-Boltzmann distributed molecular velocities is found for the gas target. The solid target data agree in shape with the phonon density-of-states curve and provide strong evidence for the phonon model including multiphonon excitations.
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Affiliation(s)
- F Atchison
- Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland
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20
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Neutron scattering lengths and fundamental neutron interactions. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/bfb0041486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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21
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Bonnet C, Chauvat D, Emile O, Le Floch A. Nonequivalence of spatial shifts and Wigner delays at interfaces. PHYSICAL REVIEW LETTERS 2004; 93:093902. [PMID: 15447102 DOI: 10.1103/physrevlett.93.093902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2003] [Revised: 05/05/2004] [Indexed: 05/24/2023]
Abstract
We isolate spatial shifts and Wigner delays for reflection at the same interface and demonstrate that they can carry different information. The spatial shifts associated with Wood anomalies on gratings can be either positive or negative, while the corresponding delays are both positive. In the standard case of total reflection at a glass-air interface, a differential two-photon absorption correlation technique allows us to measure for the first time a delay of up to 35 fs in agreement with the associated 10.5 microm spatial shift. The method also allows us to isolate giant Wigner delays. The existence of similar delays in different areas of physics is discussed.
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Affiliation(s)
- Christophe Bonnet
- Laboratoire d'Electronique Quantique-Physique des Lasers, Unité Mixte de Recherche CNRS-Université 6627 PALMS, Université de Rennes I, Campus de Beaulieu, F-35042 Rennes, France
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Penfold J, Ward RC, Williams WG. A time-of-flight neutron reflectometer for surface and interfacial studies. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3735/20/11/024] [Citation(s) in RCA: 127] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
The inelastic scattering of very slow neutrons by aluminium has been measured at four temperatures between 90 and 700° K. The results are compared with theory and found to agree within 10 %. An appendix gives in compact form the theoretical expressions which have been adopted.
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Dickinson WC, Passell L, Halpern O. Studies of the Optics of Neutrons. I. Measurement of the Neutron-Proton Coherent Scattering Amplitude by Mirror Reflection. ACTA ACUST UNITED AC 1962. [DOI: 10.1103/physrev.126.632] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Randolph PD, Brugger RM, Strong KA, Schmunk RE. Inelastic Scattering of Slow Neutrons from Methane. ACTA ACUST UNITED AC 1961. [DOI: 10.1103/physrev.124.460] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Shull CG, Wollan EO. Coherent Scattering Amplitudes as Determined by Neutron Diffraction. ACTA ACUST UNITED AC 1951. [DOI: 10.1103/physrev.81.527] [Citation(s) in RCA: 123] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Harris SP, Hibdon CT, Muehlhause CO. The Neutron Cross Section of Mn Below 5000 ev. ACTA ACUST UNITED AC 1950. [DOI: 10.1103/physrev.80.1014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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HURST DG, PRESSESKY AJ, TUNNICLIFFE PR. The Chalk River single crystal neutron spectrometer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 1950; 21:705-712. [PMID: 14781443 DOI: 10.1063/1.1745695] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
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Harris SP, Muehlhause CO, Thomas GE. Low Energy Neutron Resonance Scattering and Absorption. ACTA ACUST UNITED AC 1950. [DOI: 10.1103/physrev.79.11] [Citation(s) in RCA: 73] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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