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Academic literature on the topic 'Neutrons Polarization'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Neutrons Polarization"

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WEN, H., L. S. KISSLINGER, WALTER GREINER, and G. MAO. "NEUTRON SPIN POLARIZATION IN STRONG MAGNETIC FIELDS." International Journal of Modern Physics E 14, no. 08 (November 2005): 1197–204. http://dx.doi.org/10.1142/s021830130500379x.

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The effects of strong magnetic fields on the inner crust of neutron stars are investigated after taking into account the anomalous magnetic moments of nucleons. The energy spectra and wave functions for protons and neutrons in a uniform magnetic field are provided. The particle spin polarizations and the yields of protons and neutrons are calculated in a free Fermi gas model. Obvious spin polarizations occur when B≥1014 G for protons and B≥1017 G for neutrons, respectively. It is shown that the neutron spin polarization depends solely on the magnetic field strength.
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Kakurai, K., M. Steiner, and R. Pynn. "MAGNETIC EXCITATIONS AND POLARIZATION ANALYSIS METHOD." International Journal of Modern Physics B 07, no. 16n17 (July 30, 1993): 3095–111. http://dx.doi.org/10.1142/s0217979293003176.

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With the recent advances of efficient polarizing and flipping devices and with the increase of the absolute flux at modern neutron sources, polarized neutron inelastic scattering experiments using cold and thermal neutrons have become more commonplace. In this review paper we present experiments recently performed where this technique has been applied to obtain more detailed informations on magnetic excitations thus contributing to a deeper understanding of the spin dynamics in magnetic materials.
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Didelez, J. P., and C. Deutsch. "Persistence of the Polarization in a Fusion Process." Laser and Particle Beams 29, no. 2 (March 22, 2011): 169–74. http://dx.doi.org/10.1017/s0263034611000139.

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AbstractWe propose an experiment to test the persistence of the polarization in a fusion process, using a terawatt laser hitting a polarized high density (HD) target. The polarized protons and deuterons heated in the plasma induced by the laser have a significant probability to fuse producing a3He and a γ-ray or a neutron in the final state. The angular distribution of the radiated γ-rays and the change in the corresponding total cross-section are related to the polarization persistence, but the resulting signal turns out to be weak. By comparison, the neutrons are produced hadronically with a larger cross-section and it is much easier to detect them. A significant reduction of the cross-section by parallel polarization of the deuterons as well as a structured angular distribution of the emitted neutrons is reliably predicted by the theory. Therefore, it is expected that the corresponding signal on the neutron counting rate could be seen experimentally. Magnetic fields, relaxation times and possibilities of local investigations are discussed.
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Berikov, D., G. Ahmadov, Yu Kopatch, and V. Novitsky. "Magnetic system for controlling the spin of polarized neutrons." Journal of Instrumentation 17, no. 08 (August 1, 2022): P08030. http://dx.doi.org/10.1088/1748-0221/17/08/p08030.

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Abstract A spin control magnetic system was developed and assembled at the JINR Laboratory of Neutron Physics (Dubna, Russia) and was tested with a beam of polarized neutrons at the POLI instrument of the FRM II reactor in Garching (Germany). This paper presents the principle of operation and a method for compensating the influence of external magnetic fields on polarization using this device. The system consists of three precession coils in a magnetic screen. The first coil allows, by changing the current in it, to ensure the rotation of the neutron spin by an arbitrary angle relative to the magnetic field inside the coil. The remaining two coils are designed to compensate for the effect of scattered magnetic fields on the beam polarization, and to preserve the polarization vector direction.
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Frandsen, Benjamin A., Raju Baral, Barry Winn, and V. Ovidiu Garlea. "Magnetic pair distribution function data using polarized neutrons and ad hoc corrections." Journal of Applied Physics 132, no. 22 (December 14, 2022): 223909. http://dx.doi.org/10.1063/5.0130400.

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We report the first example of magnetic pair distribution function (mPDF) data obtained through the use of neutron polarization analysis. Using the antiferromagnetic semiconductor MnTe as a test case, we present high-quality mPDF data collected on the HYSPEC instrument at the Spallation Neutron Source using longitudinal polarization analysis to isolate the magnetic scattering cross section. Clean mPDF patterns are obtained for MnTe in both the magnetically ordered state and the correlated paramagnet state, where only short-range magnetic order is present. We also demonstrate significant improvement in the quality of high-resolution mPDF data through the application of ad hoc corrections that require only minimal human input, minimizing potential sources of error in the data processing procedure. We briefly discuss the current limitations and future outlook of mPDF analysis using polarized neutrons. Overall, this work provides a useful benchmark for mPDF analysis using polarized neutrons and provides an encouraging picture of the potential for routine collection of high-quality mPDF data.
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Gezerlis, Alexandros. "Polarization in low-density neutrons." Journal of Physics: Conference Series 426 (March 27, 2013): 012011. http://dx.doi.org/10.1088/1742-6596/426/1/012011.

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Kushoro, Matteo Hakeem, Marica Rebai, Marco Tardocchi, Carmen Altana, Carlo Cazzaniga, Eliana De Marchi, Francesco La Via, et al. "Detector Response to D-D Neutrons and Stability Measurements with 4H Silicon Carbide Detectors." Materials 14, no. 3 (January 26, 2021): 568. http://dx.doi.org/10.3390/ma14030568.

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The use of wide-band-gap solid-state neutron detectors is expanding in environments where a compact size and high radiation hardness are needed, such as spallation neutron sources and next-generation fusion machines. Silicon carbide is a very promising material for use as a neutron detector in these fields because of its high resistance to radiation, fast response time, stability and good energy resolution. In this paper, measurements were performed with neutrons from the ISIS spallation source with two different silicon carbide detectors together with stability measurements performed in a laboratory under alpha-particle irradiation for one week. Some consideration to the impact of the casing of the detector on the detector’s counting rate is given. In addition, the detector response to Deuterium-Deuterium (D-D) fusion neutrons is described by comparing neutron measurements at the Frascati Neutron Generator with a GEANT4 simulation. The good stability measurements and the assessment of the detector response function indicate that such a detector can be used as both a neutron counter and spectrometer for 2–4 MeV neutrons. Furthermore, the absence of polarization effects during neutron and alpha irradiation makes silicon carbide an interesting alternative to diamond detectors for fast neutron detection.
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Knop, W., M. Hirai, H. J. Schink, H. B. Stuhrmann, R. Wagner, J. Zhao, O. Schärpf, et al. "A new polarized target for neutron scattering studies on biomolecules: first results from apoferritin and the deuterated 50S subunit of ribosomes." Journal of Applied Crystallography 25, no. 2 (April 1, 1992): 155–65. http://dx.doi.org/10.1107/s0021889891011093.

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A new polarized target for neutron scattering has been designed by CERN and tested successfully using the reactor FRG-1 at the GKSS Research Centre. The nuclear spins are aligned with respect to the external field – parallel or antiparallel – by dynamic nuclear polarization (DNP). To avoid absorption of neutrons by 3He, the frozen solutions of biomolecules are immersed in liquid 4He which in turn is thermally coupled to the cooling mixture of 3He/4He of the dilution refrigerator. Compared with earlier experiments where the sample had been cooled directly by 3He, the rate of detectable neutrons increased by a factor of 30. Another factor of 30 is due to the installation of the cold source and the beryllium reflector in FRG-1. Polarized neutron scattering from apoferritin in deuterated solvent shows that the proton spin polarization is homogeneous in apoferritin molecules. After saturation of proton nuclear magnetic resonance (NMR), polarized neutron scattering is dominated by deuteron spin contrast. With the deuterated large subunit of E. coli ribosomes, three different basic scattering functions are derived from spin-contrast variation, reflecting the known scattering-length-density distribution of the architecture of rRNA and ribosomal proteins. The planned in situ structure determination of a mRNA fragment is discussed in the light of the present results.
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Harmon, J. F., D. P. Wells, and A. W. Hunt. "Neutrons and Photons in Nondestructive Detection." Reviews of Accelerator Science and Technology 04, no. 01 (January 2011): 83–101. http://dx.doi.org/10.1142/s1793626811000495.

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Active, nondestructive interrogation with neutrons and photons has seen a renaissance in recent years, owing to a broad spectrum of important applications in security, nuclear nonproliferation, contraband detection and materials analysis. Active methods are of high interest for such applications because they provide at least an order of magnitude greater sensitivity than passive methods. Accelerator-based neutron and photon active methods exploit two important factors to attain greater sensitivity: these are (i) the control of interrogating beam properties such as directionality, energy, intensity, polarization and the temporal distribution of radiation; (ii) well-founded, low energy nuclear physics that yields distinct "signatures" for elemental and isotopic content. This review addresses accelerator-based neutron and photon nondestructive testing methods and issues when applied to modern and emerging wide-ranging challenges in nondestructive detection.
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Ghosal, Debdeep. "Measurement of π0π+/− photoproduction off the deuteron and dbutanol targets." EPJ Web of Conferences 199 (2019): 02010. http://dx.doi.org/10.1051/epjconf/201919902010.

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Recent experiments using the Crystal Ball/TAPS setup at the MAMI accelerator in Mainz, Germany continue to study the properties and the excitation spectrum of the nucleon with meson photoproduction. Electromagnetic excitations of the proton and neutron are essential for understanding their isospin decomposition. The electromagnetic coupling of photons to protons is different than that of neutrons in certain states. Cross-section data alone is not sufficient for separating resonances, whereas polarization observables play a crucial role being essential in disentangling the contributing resonant and non-resonant amplitudes. Preliminary results of the polarization observable E of double π production off an unpolarized (LD2) and polarized (dButanol) target are shown with comparison to predictions of recent analyses.
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Dissertations / Theses on the topic "Neutrons Polarization"

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Schwesig, Steffen. "Novel type of neutron polarization analysis using the multianalyser at PUMA implementation, characterization and first experiments." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0005-1296-D.

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Lai, Anzhi. "Bhabha scattering in e+e- collisions at TRISTAN /." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10042006-143839/.

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Riz, Luca. "Spin polarization effects in neutron stars." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/253498.

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This thesis is concerned with effects of spin polarization in neutron stars. In particular, we focus on static and dynamic properties of dense neutron matter. We use two different kind of potential to perform our studies: the phenomenological two-body Argonne V$8$' potential plus the three-body Urbana IX force and a modern local version of chiral effective potential up to next-to-next-to-leading order (N$2$LO). Estimates are calculated for the neutrino mean free path in partially spin-polarized neutron matter starting from Quantum Monte Carlo (QMC) simulations and using mean-field approaches to compute the response function in the longitudinal and transverse channel. We also compute magnetic susceptibility of dense neutron matter from accurate QMC calculations of partially spin-polarized systems. Twist-averaged boundary conditions (TABC) have been implemented to reduce finite-size effects. In the results, we also account for the theoretical uncertainty coming from the chiral expansion scheme. These results may play a role in studying high-energy phenomena such as neutron star mergers and supernova explosions, although they have been computed only at T$=0$ K.
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Simpson, B. R. S. "Polarization in neutron-proton elastic scattering at 21.6 MEV." Doctoral thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/7618.

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Bibliography: leaves 102-106.
The polarization in n-p scattering has been measured at 21.6 MeV using polarized neutrons from the T(d,ṅ)4He reaction. The measuring instrument was an anthracene scintillation polarimeter. A critical assessment of this polarimeter was made, and extensive refinements to the polarimeter were introduced so as to minimise perceived sources of systematic error. These included improvements both in instrumental design and data reduction techniques.
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Hasz, Kathryn. "Polarization Analyzed Small Angle Neutron Scattering of Ferrite Nanoparticles." Oberlin College Honors Theses / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1400837839.

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Schwesig, Steffen [Verfasser], Götz [Akademischer Betreuer] Eckold, Götz [Gutachter] Eckold, and Simone [Gutachter] Techert. "Novel type of neutron polarization analysis using the multianalyser at PUMA implementation, characterization and first experiments / Steffen Schwesig ; Gutachter: Götz Eckold, Simone Techert ; Betreuer: Götz Eckold." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/1199105007/34.

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Van, Niekerk David Douglas. "Application of the relativistic random-phase and distorted wave impulse approximations to quasielastic proton-nucleus scattering." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5220.

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Thesis (PhD (Physics))--University of Stelllenbosch, 2010.
ENGLISH ABSTRACT: In this dissertation a fully relativistic model for polarized inclusive quasielastic proton-nucleus scattering is developed. Using a standard relativistic impulse approximation (RIA) treatment of quasielastic scattering and a two-body SPVAT form of the current operator, it is shown how the behaviour of projectile and target can be decoupled. Subsequently, different models for projectile and target can be adopted and combined to examine a variety of relativistic effects. The most simplistic model of the target is provided by a mean-field nuclear matter approximation to the relativistic meson-nucleon model, quantum hadrodynamics (QHD). Here relativistic effects manifest as an effective mass, which is lower than the free mass, of the constituent nucleons. This model is improved upon by including many-body correlations through medium-modification of meson propagators in the relativistic random-phase approximation (RPA). Since it is generally accepted that the strong nuclear force and the extended range of the nuclear potential lead to distortion effects on the projectile and ejectile (seen as a modulation of the wave functions), our formalism is geared towards the use of relativistic distorted waves (RDWIA). The distorted waves are written as partial wave expansions and are solutions to the Dirac equation with potentials. The inclusion of distortions, however, greatly increases the computational burden and we show how a number of analytical and numerical techniques can be used to facilitate the process of calculation. It is also shown how the standard relativistic plane wave treatment (RPWIA) can, instead, be easily employed to obtain a baseline for determining the impact of distortions. A calculation is performed for the reaction 40Ca(!p, !p !) at a beam energy of 500 MeV. Here it is found that the effect of correlations on the RPWIA calculation can be seen as a quenching of the cross section that is expected to become more pronounced at lower energies or for higher density targets. A RDWIA calculation shows additional reduction and if target correlations are included this effect is enhanced. To our knowledge this is the first calculation that attempts to include both these effects (RPA and RDWIA) in the context of quasielastic proton-nucleus scattering.
AFRIKAANSE OPSOMMING: In hierdie proefskrif word ’n ten volle relatiwistiese model vir die berekening van inklusiewe kwasielastiese proton-kern verstrooiing daargestel. Deur gebruik te maak van ’n standaard relatiwistiese impulsbenadering (RIA) vir kwasi-elastiese verstrooiing asook ’n twee-deeltjie-SPVAT-vorm vir die stroom-operator, word daar gewys hoedat die gedrag van die projektiel en teiken ontkoppel kan word. Verskillende modelle kan dus vir die projektiel en teiken gebruik word om ’n verskeidenheid relatiwistiese effekte te bestudeer. Die mees simplistiese model vir die teiken word verskaf deur ’n gemiddelde-veld kernmateriaalbenadering tot die relatiwistiese meson-nukleon-model, kwantum-hadrodinamika (QHD). In hierdie model manifesteer relatiwistiese effekte as ’n effektiewe massa, wat kleiner is as die vrye massa, van nukleone in die kern. Hierdie model word verbeter deur die inagneming van veeldeeltjie korrelasies deur medium-gewysigde meson-propagators in die relatiwistiese ewekansige-fase-benadering (RPA). Aangesien dit algemeen aanvaar word dat die sterk-wisselwerking en die reikwydte van die kernpotensiaal aanleiding gee tot vervormingseffekte op die projektiel en ejektiel (gesien as die modulasie van golffunksies), is ons model optimaal geformuleer om gebruik te maak van relatiwistiese vervormde golwe (RDWIA). Die vervormde golwe word geskryf as parsi¨elegolf uitbreidings en dien as oplossings vir die Dirac-vergelyking met potensiale. Insluiting van vervormings vermeerder egter die berekeningslas geweldig en ons toon hoedat ’n aantal analitiese en numeriese tegnieke gebruik kan word om die proses te vergemaklik. Daar word ook aangetoon hoe die standaard- relatiwistiese-vlakgolf-benadering (RPWIA), in plaas van vevormde golwe, maklik gebruik kan word om ’n verwysingspunt vir die meting van die effek van vervormings te bepaal. ’n Berekening vir die reaksie 40Ca(!p, !p !) teen ’n projektiel-energie van 500 MeV word getoon. Hier word dit gevind dat die effek van korrelasies op die RPWIA-berekening gesien kan word as ’n verlaging van die kansvlak. Daar word verwag dat hierdie effek duideliker sal word by laer energie¨e en ho¨er kerndigthede. ’n RDWIA-berekening word getoon wat daarop dui dat addisionele verlaging in die kansvlak voorkom en indien korrelasies hier ingesluit word, word hierdie effek vergroot. Sover ons kennis strek, is hierdie die eerste berekening wat poog om beide hierdie effekte (RPA en RDWIA) in die konteks van kwasi-elastiese proton-kern verstrooiing in te sluit.
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Ohlsson, Tommy. "Dynamics of quarks and leptons : theoretical Studies of Baryons and Neutrinos." Doctoral thesis, KTH, Fysik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2991.

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The Standard Model of Elementary Particle Physics (SM) is the present theoryfor the elementary particles and their interactions and is a well-established theorywithin the physics community. The SM is a combination of Quantum Chromodynamics(QCD) and the Glashow{Weinberg{Salam (GWS) electroweak model. QCDis a theory for the strong force, whereas the GWS electroweak model is a theoryfor the weak and electromagnetic forces. This means that the SM describes allfundamental forces in Nature, except for the gravitational force. However, the SMis not a nal theory and some of its problems will be discussed in this thesis.In the rst part of this thesis, several properties of baryons are studied suchas spin structure, spin polarizations, magnetic moments, weak form factors, andnucleon quark sea isospin asymmetries, using the chiral quark model (QM). TheQM is an eective chiral eld theory developed to describe low energy phenomena of baryons, since perturbative QCD is not applicable at low energies. The resultsof the QM are in good agreement with experimental data.The second part of the thesis is devoted to the concept of quantum mechanicalneutrino oscillations. Neutrino oscillations can, however, not occur within the GWSelectroweak model. Thus, this model has to be extended in some way. All studiesincluding neutrino oscillation are done within three avor neutrino oscillationmodels. Both vacuum and matter neutrino oscillations are considered. Especially,global ts to all data of candidates for neutrino oscillations are presented and alsoan analytical formalism for matter enhanced three avor neutrino oscillations usingtime evolution operators is derived. Furthermore, investigations of matter eectswhen neutrinos traverse the Earth are included.The thesis begins with an introductory review of the QM and neutrino oscillationsand ends with the research results, which are given in the nine accompanyingscientic articles.
QC 20100616
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Jordan, Elodie. "Dimensionnement et réalisation d'un rotateur de polarisation à évolution de mode en optique intégrée sur verre." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT085/document.

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La création du premier laser en 1960 puis l’envol des télécommunications par fibres optique a généré le développement des circuits optiques intégrés. Ces derniers sont des solutions efficaces aux problèmes d’encombrement et d’instabilité. Un contrôle accru des signaux passe cependant par l’exploitation de la polarisation qui permet notamment d’augmenter les débits, de fiabiliser les signaux et de protéger les sources par une isolation optique. Cette dernière application fait partie d’un vaste projet mené par l’IMEP-LAHC en collaboration avec le laboratoire Hubert Curien de Saint-Etienne. L’isolateur sur verre comprend l’intégration d’un séparateur de polarisation, d’un rotateur Faraday et d’un rotateur réciproque de polarisation à 45°. L’objectif de ces travaux «était de démontrer la faisabilité de la dernière fonction. La réalisation s’est basée sur l’exploitation d’échanges d’ions assistés par un champ électrique (EAC). Une première étape a consisté à maîtriser les effets de bords inhérents aux EAC, afin de modeler le cœur d’un guide d’onde et incliner les axes neutres de polarisation. Ceci a été obtenu en cascadant deux EAC, le premier créant un guide d’indice de réfraction uniforme, le deuxième modelant son cœur. Le contrôle de la position des axes neutres a ainsi été démontrée pour la première fois dans cette technologie puisqu’une inclinaison à (46,6 ± 0,1)° en entrée et (42,3 ± 0,1)° en sortie a été mesurée. L’étude numérique du procédé de fabrication du rotateur réciproque a également été effectuée et l’adiabaticité du composant a été validé analytiquement. Une première réalisation a mis en évidence un problème de pertes élevées liées au dégazage des sels d’échange. Des pistes d’optimisation sont donc avancées. Une suggestion d’amélioration du rotateur Faraday est également présentée. Elle exploite les progrès obtenus sur les EAC et démontre la faisabilité de guides d’ondes à biréfringence négative. Finalement un procédé de fabrication de l’isolateur complet, compatible avec le budget thermique, est proposé
The fabrication of the first laser in 1960 and the growth of fiber optics telecommunications have led to the development of integrated optics circuits. Theses lasts are efficient solutions to compacity and misalignment problems. Moreover, polarization management in integrated circuits enables to increase the data rate, to guaranty the signals reliability or to protect optical sources. The work presented here is dedicated to this last application, which is the motive of a long-term collaboration between IMEP-LAHC and the Hubert Curien institute in Saint-Etienne. Indeed, we proposed to fabricate a 45° reciprocal polarization rotator that is part of the optical isolator’s design, along with a polarization splitter and a Faraday rotator. We choose to use a field-assisted ion-exchange technique (FAIE). The implementation of the polarization rotator requires managing the side effects of the electrical field lines occurring during a FAIE. It allows controlling the waveguide core’s shape and thus the eigen axes tilt. It was obtained thanks to two cascaded FAIE. The first one, an Ag+/Na+ ion exchange, creates a high refractive index waveguide while the second one, a Na+/Na+ ion exchange, modifies the shape of the waveguide’s core. Measurements of the experimental polarization behavior are a first proof of a controlled tilt of eigen axes in this technology. Indeed, the waveguide exhibits a tilt of its eigen axes of (46.6 ± 0.1)° at the input and (42.3 ± 0.1)° at the output.The numerical study of the reciprocal rotator’s process has also been proposed and the adiabaticity of the design analytically validated. The first realization highlights high propagation losses that can linked to the degassing of the nitrate salts occurring during the FAIE. Possible improvements are thus suggested in the document.An enhancement of the Faraday rotator’s design is also proposed. It is obtained thanks to the fabrication of a waveguide exhibiting a negative birefringence whose design exploits the progress achieved in term of FAIE control. Eventually, a complete fabrication of the integrated isolator is proposed, taking into account the thermal budget of the various processes
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Sotty, Christophe. "Study of the nuclear structure far from stability : Coulomb excitation of neutron-rich Rb isotopes around N=60; Production of nuclear spin polarized beams using the Tilted Foils technique." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00923003.

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La structure sous-jacente dans la zone A~100, N~60 a été étudié intensivement et extensivement, principalement par décroissance β et spectroscopie γ suite à des réactions de fission. Autour de N~60, en ajoutant juste quelques neutrons, protons un changement de forme rapide des états fondamentaux se produit, allant de sphérique à bien déformé. La coexistence de forme observée dans les noyaux de Sr et Zr est supposée avoir lieu dans toute la région. Les mécanismes impliqués dans l'apparition de la déformation n'étaient pas clairement identifiés. L'interaction entre les orbitales de Nilsson montantes et descendante est évoqué comme l'une des principales raisons du changement de forme. Cependant, une identification claire des orbitales proton et neutron en jeu était nécessaire. A cet effet, l'étude des isotopes ⁹³′⁹⁵′⁹⁷′⁹⁹Rb riches en neutrons a été réalisé excitation Coulombienne au CERN (ISOLDE) en utilisant le post-accélérateur REX-ISOLDE et le dispositif Miniball. Les structures excitées encore inconnues des isotopes ⁹⁷′⁹⁹Rb ont été peuplées et observées. Les coïncidences de transitions γ des états de basse énergie ont été observées et leur corrélations ont permis la construction de schémas de niveaux. Les probabilités de transitions associées ont été extraites grâce code GOSIA. Les éléments de matrice de l'opérateur électromagnétique observées constituent de nouveaux apports afin d'effectuer de nouveaux calculs théoriques permettant de statuer sur les orbitales impliquées. La sensibilité des expériences de ce type peut être accrue en utilisant des faisceaux radioactifs d'ions dont le spin nucléaire est polarisé. La technique de polarisation des feuilles orientées (TFT) fut étudiée dans ce but au CERN. Un nouveau polariseur TFT et un dispositif β-NMR ont être créés et installés après REX-ISOLDE. La connaissance du processus de polarisation associé à la technique reste incomplète à ce jour et de plus amples études sont nécessaires. Des tests préliminaires prometteurs ont été effectués sur le noyau de ⁸Li afin de déterminer le potentiel du dispositif actuel.
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Books on the topic "Neutrons Polarization"

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Williams, W. Gavin. Polarized neutrons. Oxford [England]: Clarendon Press, 1988.

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Krupchit͡skiĭ, P. A. Fundamentalʹnye issledovanii͡a s poli͡arizovannymi medlennymi neĭtronami. Moskva: Ėnergoatomizdat, 1985.

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Schweika, Werner, and Thomas Brückel. Polarized neutron scattering: Lectures of the 1st summer school held at the Forschungszentrum Jülich from 10 to 14 September 2002. Edited by Forschungszentrum Jülich. Jülich, Germany: Forschungszentrum Jülich, Central Library, 2002.

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International Workshop on Polarised Neutrons for Condensed Matter Investigations (3rd 2000 Saint Petersburg, Russia). Proceedings of the Third International Workshop on Polarised Neutrons for Condensed Matter Investigations, PNCMI 2000, held in Gatchina, St. Petersburg, Russia, 20-25 June 2000. Edited by Maleyev S. V and Toperverg B. P. Amsterdam: North-Holland, 2001.

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Gould, Alan R. Time Reversal Invariance and Parity Violation in Neutron Reactions: Proceedings of the International Conference. World Scientific Pub Co Inc, 1994.

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R, Gould C., Popov I͡U︡ P, Bowman J. D, Triangle Universities Nuclear Laboratory, and International Workshop on Time Reversal Invariance and Parity Violation in Neutron Reactions (2nd : 1993 : Dubna, Chekhovskiĭ raĭon, Russia), eds. Time reversal invariance and parity violation in neutron reactions: Dubna, Russia, 4-7 May 1993. Singapore: World Scientific, 1994.

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Boothroyd, Andrew T. Principles of Neutron Scattering from Condensed Matter. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862314.001.0001.

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The book contains a comprehensive account of the theory and application of neutron scattering for the study of the structure and dynamics of condensed matter. All the principal experimental techniques available at national and international neutron scattering facilities are covered. The formal theory is presented, and used to show how neutron scattering measurements give direct access to a variety of correlation and response functions which characterize the equilibrium properties of bulk matter. The determination of atomic arrangements and magnetic structures by neutron diffraction and neutron optical methods is described, including single-crystal and powder diffraction, diffuse scattering from disordered structures, total scattering, small-angle scattering, reflectometry, and imaging. The principles behind the main neutron spectroscopic techniques are explained, including continuous and time-of-flight inelastic scattering, quasielastic scattering, spin-echo spectroscopy, and Compton scattering. The scattering cross-sections for atomic vibrations in solids, diffusive motion in atomic and molecular fluids, and single-atom and cooperative magnetic excitations are calculated. A detailed account of neutron polarization analysis is given, together with examples of how polarized neutrons can be exploited to obtain information about structural and magnetic correlations which cannot be obtained by other methods. Alongside the theoretical aspects, the book also describes the essential practical information needed to perform experiments and to analyse and interpret the data. Exercises are included at the end of each chapter to consolidate and enhance understanding of the material, and a summary of relevant results from mathematics, quantum mechanics, and linear response theory, is given in the appendices.
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Maggiore, Michele. Gravitational Waves. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198570899.001.0001.

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A comprehensive and detailed account of the physics of gravitational waves and their role in astrophysics and cosmology. The part on astrophysical sources of gravitational waves includes chapters on GWs from supernovae, neutron stars (neutron star normal modes, CFS instability, r-modes), black-hole perturbation theory (Regge-Wheeler and Zerilli equations, Teukoslky equation for rotating BHs, quasi-normal modes) coalescing compact binaries (effective one-body formalism, numerical relativity), discovery of gravitational waves at the advanced LIGO interferometers (discoveries of GW150914, GW151226, tests of general relativity, astrophysical implications), supermassive black holes (supermassive black-hole binaries, EMRI, relevance for LISA and pulsar timing arrays). The part on gravitational waves and cosmology include discussions of FRW cosmology, cosmological perturbation theory (helicity decomposition, scalar and tensor perturbations, Bardeen variables, power spectra, transfer functions for scalar and tensor modes), the effects of GWs on the Cosmic Microwave Background (ISW effect, CMB polarization, E and B modes), inflation (amplification of vacuum fluctuations, quantum fields in curved space, generation of scalar and tensor perturbations, Mukhanov-Sasaki equation,reheating, preheating), stochastic backgrounds of cosmological origin (phase transitions, cosmic strings, alternatives to inflation, bounds on primordial GWs) and search of stochastic backgrounds with Pulsar Timing Arrays (PTA).
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Vigdor, Steven E. Where’s the Antimatter Gone, Long Time Passing? Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0002.

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Chapter 2 describes experiments searching for CP symmetry violations that might account for the matter–antimatter imbalance in our universe. It describes the historical discovery of mesons and quantum-mechanical oscillations between particle and antiparticle (i.e., particle–antiparticle oscillations) in the neutral K meson and heavier meson systems. It introduces quarks and quark flavor. The chapter relates CP violation to violations of time reversal invariance that might be revealed by a spatial separation of positive and negative electric charge within or around the fundamental constituent particles of matter. It describes a halfcentury of experimental searches, including ongoing projects, for the particle electric dipole moments that would characterize such a charge separation. Technological advances (such as ultra-cold neutron beams) and theoretical concepts (such as vacuum polarization) relevant to these searches are introduced. While some CP violation has been clearly observed, its extent remains insufficient to account for the universe’s matter–antimatter imbalance.
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Book chapters on the topic "Neutrons Polarization"

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Krupchitsky, Pyotr A. "Circular Polarization of Gamma Rays Emitted by Nuclei After Polarized Neutrons Capture." In Fundamental Research with Polarized Slow Neutrons, 50–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-52501-8_5.

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Sieber, W. "Polarization Angle Swings Rediscussed." In The Origin and Evolution of Neutron Stars, 57. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3913-4_15.

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Malgrange, Cécile. "X-Ray Polarization and Applications." In X-Ray and Neutron Dynamical Diffraction, 91–109. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-5879-8_6.

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Bignami, G. F., P. A. Caraveo, I. Mitrofanov, and G. Vacanti. "Search for Linear Polarization in High-Energy γ-Ray Sources." In Timing Neutron Stars, 363–68. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2273-0_33.

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Gil, J. A. "Triplicity of Pulsar Profiles and Orthogonal Polarization Modes." In The Origin and Evolution of Neutron Stars, 58. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3913-4_16.

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Barnard, John J. "Pulsar Polarization Limiting Radii and the Evolution of Pulsar Beams." In The Origin and Evolution of Neutron Stars, 56. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3913-4_14.

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Hashimoto, Takeji. "Polarization of Scattered Electromagnetic Wave and Light Scattering from Optically Anisotropic Scattering Elements." In Principles and Applications of X-ray, Light and Neutron Scattering, 73–79. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-1645-7_6.

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Han, D., Y. S. Kim, and D. Son. "E(2)-like little group for massless particles and neutrino polarization as a consequence of gauge invariance." In Special Relativity and Quantum Theory, 346–54. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3051-3_31.

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Schweizer, J. "Polarized Neutrons and Polarization Analysis." In Neutron Scattering from Magnetic Materials, 153–213. Elsevier, 2006. http://dx.doi.org/10.1016/b978-044451050-1/50005-7.

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Krishnan, Kannan M. "Introduction to Materials Characterization, Analysis, and Metrology." In Principles of Materials Characterization and Metrology, 1–67. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198830252.003.0001.

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Tailoring microstructures is central to materials development for any technological application. Microstructure includes information on the atomic, mesoscopic, and microscopic length scales, and its tailoring is enabled by characterization, which relates synthesis and processing of materials to their structure, properties, and performance. Typically, probe and signal radiations are used to characterize a specimen and their interactions may be elastic or inelastic, and coherent or incoherent. Probes are based on the electromagnetic spectrum, and their characteristics (e.g. energy, wavelength, momentum, polarization) define their interaction with matter, and determine the nature, scope, and details of any characterization method. Probes or signals, can also be electrons, ions, or neutrons. Characterization techniques are classified as spectroscopy, diffraction and scattering, and imaging and microscopy. Principal features of the materials, i.e. details of their electronic structure, including atomic mass, their crystallography, composition, phase, and morphology contribute to the observable signals. Criteria for technique selection also include penetration depth and mean free path, resolution, detection limits, potential damage to the specimen, and specimen preparation requirements; our goal is to maximize information while minimizing damage. Characterization methods find wide use across many disciplines including engineering, scinces, and art conservation.
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Conference papers on the topic "Neutrons Polarization"

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Huffman, P. R., C. R. Gould, D. G. Haase, C. D. Keith, N. R. Roberson, M. L. Seely, and W. S. Wilburn. "An experimental test of parity-even time reversal invariance with MeV neutrons." In The 8th International symposium on polarization phenomena in nuclear physics. AIP, 1995. http://dx.doi.org/10.1063/1.48650.

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Dieterle, Manuel, and Lilian Witthauer. "Double Polarization ObservableEin η, π0, and 2π0Photoproduction off Protons and Neutrons." In Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015). Journal of the Physical Society of Japan, 2016. http://dx.doi.org/10.7566/jpscp.10.032004.

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Akatsuka, Hiroaki, Takashi Higuchi, Sean Hansen-Romu, Kichiji Hatanaka, Tomohiro Hayamizu, Masahiro Hino, Go Ichikawa, et al. "Study of Thin Iron Films for Polarization Analysis of Ultracold Neutrons." In Proceedings of the 24th International Spin Symposium (SPIN2021). Journal of the Physical Society of Japan, 2022. http://dx.doi.org/10.7566/jpscp.37.020801.

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Masuda, Yasuhiro. "T-violation in neutron spin rotation." In The 8th International symposium on polarization phenomena in nuclear physics. AIP, 1995. http://dx.doi.org/10.1063/1.48646.

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Ahmidouch, A., J. Arnold, B. van den Brandt, M. Daum, Ph Demierre, R. Drevenak, M. Finger, et al. "Spin observables in neutron-proton elastic scattering." In The 8th International symposium on polarization phenomena in nuclear physics. AIP, 1995. http://dx.doi.org/10.1063/1.48664.

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Jau, Yuan-Yu. "3He NSFs for sensitive neutron polarimetry and neutron E-field imaging." In Proposed for presentation at the Polarization in Noble Gases workshop 2021 held December 6-10, 2021 in ,. US DOE, 2021. http://dx.doi.org/10.2172/1899669.

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Yen, Yi-Fen, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, C. M. Frankle, K. Fukuda, C. R. Gould, et al. "Study of parity and time-reversal violation in neutron-nucleus interactions." In The 8th International symposium on polarization phenomena in nuclear physics. AIP, 1995. http://dx.doi.org/10.1063/1.48656.

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Braun, R. T., W. Tornow, D. E. González Trotter, C. R. Howell, R. Machleidt, C. D. Roper, F. Salinas, H. R. Setze, and R. L. Walter. "Neutron-proton analyzing power at 12 MeV and charged πNN coupling constant." In The 8th International symposium on polarization phenomena in nuclear physics. AIP, 1995. http://dx.doi.org/10.1063/1.48661.

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Gezerlis, Alexandros, and Rishi Sharma. "Polarization in low-density neutron matter." In Xth Quark Confinement and the Hadron Spectrum. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.171.0257.

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Buttimore, N. H., Roberto Fiore, Igor Ivanov, Alessandro Papa, and Jacques Soffer. "Forward Helion Scattering and Neutron Polarization." In DIFFRACTION 2008: International Workshop on Diffraction in High Energy Physics. AIP, 2009. http://dx.doi.org/10.1063/1.3122170.

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Reports on the topic "Neutrons Polarization"

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Dr. Jonathan M. Richardson. Long-Lifetime Low-Scatter Neutron Polarization Target. Office of Scientific and Technical Information (OSTI), July 2004. http://dx.doi.org/10.2172/825731.

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FERNOW, R. C., J. C. GALLARDO, and Y. FUKUI. MUON POLARIZATION EFFECTS IN THE FRONT END OF THE NEUTRINO FACTORY. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/759043.

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