Дисертації з теми "NUCLEON SPIN"
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Cunningham, Elizabeth Sarah. "The effect of spin-spin interactions on nucleon-nucleus scattering." Thesis, University of Surrey, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527010.
Повний текст джерелаUnrau, Peter. "Spin dependent nucleon structure at intermediate Q²." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38381.
Повний текст джерелаTang, Jian 1968. "Spin structure of nucleon in the asymptotic limit." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38418.
Повний текст джерелаSteffens, Fernando Monti. "The spin and flavour structure of the nucleon /." Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phs817.pdf.
Повний текст джерелаCopies of author's previously published articles inserted. Includes bibliographical references (leaves 189-206).
PUSSIEUX, THIERRY. "Mesures des fonctions de structure en spin du nucleon." Paris 11, 1994. http://www.theses.fr/1994PA112242.
Повний текст джерелаKämpfer, Burkhard, L. P. Kaptari, A. Yu Umnikov, and K. Yu Kazakov. "The Deuteron Spin-Dependent Structure Function within an Effective Meson-Nucleon Theory." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-32647.
Повний текст джерелаEldahoumi, Gamal. "Constituent Quarks and the Gluonic Contribution to the Spin of the Nucleon." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-100441.
Повний текст джерелаAmir-Ahmadi, Hamid Reza. "Three-nucleon potential effects in spin observables of elastic deuteron-proton scattering." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2006. http://irs.ub.rug.nl/ppn/292621256.
Повний текст джерелаTallini, Hugh Arthur McLaren. "A measurement of the quark spin distributions of the nucleon at HERMES." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367159.
Повний текст джерелаKämpfer, Burkhard, L. P. Kaptari, A. Yu Umnikov, and K. Yu Kazakov. "The Deuteron Spin-Dependent Structure Function within an Effective Meson-Nucleon Theory." Forschungszentrum Rossendorf, 1993. https://hzdr.qucosa.de/id/qucosa%3A22091.
Повний текст джерелаMarkoff, Diane Melanie. "Measurement of the parity nonconserving spin-rotation of transmitted cold neutrons through a liquid helium target /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/9743.
Повний текст джерелаMaheswari, Dhiraj. "QCD Process in Few Nucleon Systems." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3795.
Повний текст джерелаGrenier, Philippe. "Etude des fonctions de structure en spin du nucleon : l'experience e143 au slac." Clermont-Ferrand 2, 1995. http://www.theses.fr/1995CLF21720.
Повний текст джерелаSabatié, Franck. "Etude des fonctions de structure en spin du nucleon : l'experience e154 au slac." Caen, 1998. http://www.theses.fr/1998CAEN2026.
Повний текст джерелаWiese, Christian. "Investigating new lattice approaches to the momentum and spin structure of the nucleon." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17522.
Повний текст джерелаThis thesis deals with the theoretical computation of nucleon structure observables as they can be experimentally obtained from inclusive and semi-inclusive scattering experiments. I present two exploratory studies on spin and momentum structure observables of the nucleon in the framework of lattice QCD. Throughout this work, I use the twisted mass formalism with dynamical fermions at maximal twist, which ensures an improved continuum limit scaling for the relevant quantities. In the first part, I investigate the feasibility of a lattice calculation of the gluons’ average momentum fraction in the nucleon, a quantity that is rarely studied in lattice QCD. For this purpose, I study two different methods, namely the Feynman-Hellman theorem and the direct computation of the relevant form factor. Applying the latter method and combining it with several steps of stout gauge link smearing, I obtain a statistically significant results for the gluon content. The second study is concerned with the direct computation of the full momentum and spin distribution of quarks and antiquarks within the nucleon. I investigate the feasibility of a recently published approach proposing the computation of a purely spatial quasi-distribution that can be related to the physical distribution. I test the influence of gauge link smearing and different nucleon momentum boosts on the lattice data. Ultimately, I obtain iso-vector quark distributions for the unpolarized and polarize case that featuring a decent qualitative agreement to quark distributions acquired from phenomenological fits. As a key result of this work, I demonstrate that the demanding calculation of gluon content and the novel approach of computing quark distributions directly within lattice QCD are feasible in principle, although significantly more effort has to be invested into obtaining accurate results with reliable uncertainties.
Mammei, Juliette Mae. "Parity-Violating Elastic Electron Nucleon Scattering: Measurement of the Strange Quark Content of the Nucleon and Towards a Measurement of the Weak Charge of the Proton." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27661.
Повний текст джерелаPh. D.
Matthews, M. T. "A study of nucleon spin structure through polarised muon polarised proton deep inelastic scattering." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233868.
Повний текст джерелаWilfert, Malte Christian [Verfasser]. "Investigation of the spin structure of the nucleon at the COMPASS experiment / Malte Christian Wilfert." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1139217003/34.
Повний текст джерелаAndrieux, Vincent. "Polarisation of quarks and gluons inside the nucleon." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112244/document.
Повний текст джерелаThe work presented in this thesis is related to the study of the longitudinal spin structure of the nucleon. The aim is to determine the contribution to the spin 1/2 of the proton in terms of its constituents, quarks and gluons. The analysis is performed on the data taken with the COMPASS experiment, which benefits from a polarised muon beam at 200 GeV scattered off polarised protons from an ammonia target of 1.2 m long. The double longitudinal spin asymmetry of deep inelastic scattering cross-Section. The spin-Dependent structure function of the proton g₁p is derived from these measurements, which extend the kinematic world coverage to unexplored region so far (0,0036 < x< 0,57; 1,03 < Q² (GeV/c)² < 96 and 23 < W² (GeV/c)² < 320).The results obtained with a high statistical precision are included in a Next-To-Leading order QCD analysis of world g₁p, g₁d and g₁n (proton, deuteron and neutron) data to parametrise the polarised quark and gluon distributions. The g₁ world coverage of the x and Q² kinematic domain, which is a key point in the sensitivity to the gluon polarisation ΔG, turns out to be too limited for an accurate ΔG determination. Nevertheless, the QCD analysis allows to determine the quark spin contributions to the proton spin to 0.26<ΔΣ<0.33 at Q² = 3 (GeV/c)² in the MSbar scheme. The dominant uncertainty on ΔΣ is related to the choice of functional forms assumed in the fit. Finally, the Bjorken sum rule, which constitutes a fundamental test of QCD, is verified on the COMPASS data alone with a precision of 9%
Bernet, Colin. "Caractérisation des micromégas et mesure de la polarisation des gluons sur COMPASS." Paris 7, 2004. http://www.theses.fr/2004PA077205.
Повний текст джерелаMcAndrew, Michael Gabriel. "A measurement of the quark polarisation of the nucleon." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366732.
Повний текст джерелаZagrebelnyy, V. [Verfasser]. "Investigation of transverse-momentum-dependent functions(TMD) in azimuthal spin asymmetries of semi-inclusive deep inelastic nucleon scattering / Vitaly Zagrebelnyy." Gießen : Universitätsbibliothek, 2015. http://d-nb.info/1069740691/34.
Повний текст джерелаWiese, Christian [Verfasser], Ulrich [Gutachter] Wolff, Karl [Gutachter] Jansen, and Markus [Gutachter] Diehl. "Investigating new lattice approaches to the momentum and spin structure of the nucleon / Christian Wiese. Gutachter: Ulrich Wolff ; Karl Jansen ; Markus Diehl." Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://d-nb.info/1103570692/34.
Повний текст джерелаPesaro, Giulia. "Measurement at COMPASS of transverse spin effects on identified hadrons on a transversely polarised proton target." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4566.
Повний текст джерелаLa sezione d'urto che descrive la diff usione profondamente inelastica di un leptone carico (mu+) su di un nucleone (protone) polarizzato trasversalmente rispetto alla direzione del moto con identifi cazione di almeno un adrone nello stato finale presenta otto modulazioni azimutali, rispetto al piano de finito dallo spin del nucleone bersaglio e dal momento del leptone incidente. Tra queste le meglio conosciute sono dovute all'eff etto Collins e all'eff etto Sivers. Il primo eff etto è la frammentazione di un quark polarizzato trasversalmente in un adrone e l'ampiezza della modulazione è data dalla convoluzione della "trasversità" (ovvero la funzione di distribuzione che descrive i partoni polarizzati parallelamente o antiparallelamente allo spin del nucleone, per nucleoni polarizzati trasversalmente) con la funzione di frammentazione di Collins. L'eff etto Sivers è dovuto alla distribuzione di momento trasverso dei partoni all'interno del nucleone. Le rimanenti sei modulazioni sono dovute ad altre correlazioni tra la polarizzazione o il momento trasverso del partone e lo spin del nucleone. Il lavoro presentato in questa tesi è la misura dell'ampiezza delle modulazioni azimutali (asimmetrie) per i dati raccolti nel 2007 dall'esperimento COMPASS, usando un bersaglio di NH3 per accedere al protone polarizzato, focalizzando l'attenzione sulle asimmetrie di Collins e Sivers. Le asimmetrie sono state misurate sia su un campione di adroni carichi che su adroni identi cati con il rivelatore di luce Cerenkov RICH-1. Ampia parte del lavoro è stata dedicata alla determinazione dell'errore sistematico della misura.
The Semi-Inclusive Deep Inelastic Scattering (SIDIS) cross section, that describes the scattering of a charged lepton (mu+) o a nucleon (proton) transversely polarised with respect to its momentum, and with the detection of a hadron in the final state, has 8 independent azimuthal modulations, that depends on the spin of the target nucleon and on the lepton momentum. Among these modulations, the most famous are due to the Collins and Sivers eff ects. The Collins eff ect is the asymmetric fragmentation of a polarised quark into a hadron, and the amplitude of the modulation is proportional to the Collins fragmentation function with the transversity parton distribution function, that gives the probability difference to find a quark with the polarisation parallel or anti-parallel to the nucleon spin in a transversely polarised nucleon. The Sivers effect is due to the coupling of the quark transverse momentum and the spin in a transversely polarised nucleon. The other six modulations are due to other correlations between the quark polarisation or the quark transverse momentum and the nucleon spin. The work presented in this Thesis is the measurement of the amplitude of the azimuthal modulations (asymmetries) on the data of the COMPASS experiment, collected in 2007 using a NH3 target to access the polarised proton, focusing on the Collins and Sivers asymmetries. The asymmetries have been measured both the charged hadrons and on hadrons identif ied making use of the ring-imaging Cherenkov detector RICH-1 . Large part of the work presented here is devoted to the determination of the systematic error of the measurement.
XXIII Ciclo
1982
Sodickson, Daniel Kevin. "Spin-spin couplings in two limits : experimental, theoretical, and computational studies of dipole-coupled nuclear spins in solids." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/32601.
Повний текст джерелаIncludes bibliographical references (leaves 193-200).
by Daniel Kevin Sodickson.
Ph.D.
Hasch, Delia. "Messung der polarisierten Strukturfunktion g1(x, Q 2) des Protons mit dem HERMES-Experiment." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 1999. http://dx.doi.org/10.18452/14523.
Повний текст джерелаThe subject of this thesis is the measurement of the polarised structure function g1p of the proton in deeply inelastic positron-proton-scattering at a centre of mass energy of 7.5 GeV. The data used in the analysis were recorded during the 1997 running period of the Hermes experiment using a longitudinally nuclear polarised hydrogen target in the 27.6 GeV Hera polarised positron storage ring. The cross section asymmetry of positron-proton-scattering has been measured by counting the number of inclusively reconstructed and selected positrons with target spin vector parallel or antiparallel to the beam spin direction. Background processes, spectrometer effects, and radiative corrections have been taken into account by applying different correction procedures. Here background corrections were determined from data while spectrometer corrections were computed from Monte Carlo simulation. The dependence of Monte Carlo and radiative corrections on the model asymmetry chosen to describe polarisation dependent effects has been minimised by applying an iterative procedure. From the fully corrected cross section asymmetry the asymmetry g1/F1 has been computed in the kinematic region 0.021 < x < 0.85 and Q2 > 0.8 GeV^2 with a systematic uncertainty of 8% and a statistical accuracy of 6% to 20%, raising for decreasing x values. The polarised structure function g1p(x,Q2), determined from the asymmetry g1/F1 , was evoluted to a common Q2_0 value assuming g1/F1 to be independent of Q2. Its first moment evaluated in the measured x region is int_{0.021}^{0.85} dx g1p(x,Q2_0) = 0.122 =- 0.003 (stat) =- 0.010 (sys) at Q2_0 = 2.5 GeV^2. This result has been compared with those from E143 at SLAC and from SMC at CERN, both calculated with the same integration scheme and for the kinematic range of Hermes. With respect to the statistical uncertainties the agreement is better than 0.6 and 1.2 standard deviations, respectively. Extrapolation over the entire x range [0,1] yield for the first moment\int_{0}^{1} dx g1p(x,Q2_0) = 0.132 +- 0.003 (stat) +- 0.010 (sys) +- 0.006 (extr) where the additional error gives the uncertainty in the extrapolation x -> 0. The interpretation of this measurement in the framework of the quark parton model taking QCD corrections of the order O(alphaS^3) into account results in a contribution of the quarks to the total nucleon spin of (30 +- 10)% at Q2_0 = 2.5 GeV^2. This result corresponds to a deviation from the Ellis-Jaffe prediction by 2.5 standard deviation regarding the given total uncertainty. Within the quark parton model the deviation can be interpreted as negative polarisation of the strange sea quarks with a contribution of (-9 +- 4)% at Q2_0 = 2.5 GeV^2. Different groups give contributions of the quarks to the nucleon spin of 19% to 44% which were obtained from QCD analyses of various data sets. The fundamental Bjorken sum rule has been determined at Q2_0 = 2.5 GeV^2 using the Hermes measurement of the polarised neutron structure function g1n. With respect to the experimental accuracy of 13 %, the result agrees within 0.5 standard deviation with the theoretical prediction taking QCD corrections of the order O(alphaS^3) into account.
Deur, A. "La structure en spin du nucléon." Habilitation à diriger des recherches, Université Blaise Pascal - Clermont-Ferrand II, 2008. http://tel.archives-ouvertes.fr/tel-00407961.
Повний текст джерелаBvumbi, Suzan Phumudzo. "Spin and parity assignment in 152 Gd investigating octupole structures." Thesis, University of Western Cape, 2008. http://hdl.handle.net/11394/3267.
Повний текст джерелаThe high-spin states of the nucleus 152Gd have been populated via the 152Sm (α, 4n) 152Gd fusion-evaporation reaction at a beam energy of 45MeV. The emitted γ rays were observed with the AFRODITE spectrometer array. The previously known decay scheme of 152Gd was extended. Directional Correlation from Oriented states of nuclei (DCO) and linear polarization measurements were performed in order to assign spins and parities in the 152Gd decay scheme. An alternative interpretation of the first excited Kπ = 0+ band, previously considered to be a β-vibration is discussed.
Zhu, Leiming. "A study of spin dynamics and molecular structure of nucleic acids by NMR /." Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/11543.
Повний текст джерелаHansen, Rasmus Hvass. "Towards the nuclear spin quantum computer." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442465.
Повний текст джерелаKhandogin, Yang. "Nonrelativistic and scalar relativistic nuclear spin-spin couplings in density functional theory." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0017/MQ48017.pdf.
Повний текст джерелаRIBEIRO, HUGO [Verfasser]. "Nuclear-Spin Induced Electron Spin Decoherence In Semiconductor Quantum dots / Hugo Ribeiro." Konstanz : Bibliothek der Universität Konstanz, 2012. http://d-nb.info/1023210444/34.
Повний текст джерелаKim, Jungtaek. "Electron-nuclear spin control and carrier spin dynamics in II-VI semiconductor." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17524.
Повний текст джерелаThis work is composed of two parts of studies. The first part represents an electron-nuclear spin control in II-VI semiconductor quantum dots (QDs) by electrical currents via micro coils. Micrometer single turn coils are fabricated on top of heterostructures with charged CdSe/ZnSe QDs. Current injection creates magnetic fields in the range of some 10 mT which is strong enough to modulate the hyperfine interaction in CdSe. The micrometer-range diameter of coil allows for generation of fast field transient in the range of few ns. Using these advantages of micro coils, local control of the resident electron spin as well as read out of the nuclear spin state are demonstrated by electrical pulses. The second part presents charged carrier spin dynamics in ZnO quantum wells and epilayers using the optical transition of the negatively charged exciton X− and the neutral donor bound exciton D0X, respectively. The hole spin can be directly traced by the circular polarized photoluminescence of both complexes. The spin relaxation of the resident electrons and donor electrons is accessed via the bleaching of the spin selective excitation process. Longitudinal hole spin relaxation times of 80 and 140 ps are found for D0X and X−, respectively. Much longer longitudinal electron spin relaxation times in the several 100 ns range are uncovered if the hyperfine interaction is suppressed by a proper external magnetic field. A field strength of 2 mT is large enough proving that the extremely small value of the Overhauser field in ZnO caused by the very restricted number of magnetic nuclei interacting with the electron inside the donor volume.
Tilles, P. F. C. [UNESP]. "Quantização de partículas com spin." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/138360.
Повний текст джерелаUma partícula clássica relativística é descrita utilizando-se o formalismo de Dirac para sistemas vinculados devido à invariança sob transformações de reparametrizações requerida por uma teoria explícitamente covariante. Nós introduzimos os graus de liberdade de spin via variáveis de Grassman, que levam diretamente ao conceito de supersimetria presente na teoria. As equações de movimento e a quantização são consideradas tanto para as teorias livres de spin 0 e 1/2, como para a teoria com interação eletromagnética. A álgebra dos vínculos de primeira classe é extendida para descrever partículas de spin N/2, que incluem as representações de spin 1. A teoria quântica obtida é comparada com a teoria clássica de campos
Aclassical relativistic particleis described by means of Dirac's formalism for constrained systems, where the constraints come from the reparametrization invariance required by an explicitly covariant theory. We introduce spin degrees of freedom via Grassman variables, which leads directly to the concept of supersymmetry in the theory. The equations of motion and quantization are considered both for the spin 0 and 1/2 free theories, and for the eletromagnetic interaction. The first class constraints algebra is extended to describe spin N/2 particles, which include spin 1 representations. The quantum theory obtained is compared to the classical theory of fields
Tilles, Paulo Fernando Coimbra. "Quantização de partículas com spin /." São Paulo, 2007. http://hdl.handle.net/11449/138360.
Повний текст джерелаBanca: Bruto Max Pimentel Escobar
Banca: Ricardo Ivan Medina Bascur
Resumo: Uma partícula clássica relativística é descrita utilizando-se o formalismo de Dirac para sistemas vinculados devido à invariança sob transformações de reparametrizações requerida por uma teoria explícitamente covariante. Nós introduzimos os graus de liberdade de spin via variáveis de Grassman, que levam diretamente ao conceito de supersimetria presente na teoria. As equações de movimento e a quantização são consideradas tanto para as teorias livres de spin 0 e 1/2, como para a teoria com interação eletromagnética. A álgebra dos vínculos de primeira classe é extendida para descrever partículas de spin N/2, que incluem as representações de spin 1. A teoria quântica obtida é comparada com a teoria clássica de campos
Abstract: Aclassical relativistic particleis described by means of Dirac's formalism for constrained systems, where the constraints come from the reparametrization invariance required by an explicitly covariant theory. We introduce spin degrees of freedom via Grassman variables, which leads directly to the concept of supersymmetry in the theory. The equations of motion and quantization are considered both for the spin 0 and 1/2 free theories, and for the eletromagnetic interaction. The first class constraints algebra is extended to describe spin N/2 particles, which include spin 1 representations. The quantum theory obtained is compared to the classical theory of fields
Mestre
Giri, Rakshyakar. "Electron and nuclear spin dynamics in GaAs microcavities." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20037/document.
Повний текст джерелаWe obtained Faraday rotation (FR) up to 19° by using optical orientation of electron gas in n-doped bulk GaAs confined in a microcavity (Q=19000), in the absence of magnetic field. This strong rotation is achieved because the light makes multiple round trips in the microcavity. We also demonstrated fast optical switching of FR in sub-microsecond time scale by sampling the FR in a one-shot experiment under pulsed excitation. From the depolarization of FR by a transverse magnetic field, we deduce electron spin relaxation time of about 160 ns. A concept of FR cross-section as a proportionality coefficient between FR angle, electron spin density and optical path is introduced. This FR cross-section which defines the efficiency of spin polarized electrons in producing FR was estimated quantitatively and compared with theory. We also demonstrated non-destructive measurement of nuclear magnetization in n-GaAs via cavity enhanced FR. In contrast with the existing optical methods, this detection scheme does not require the presence of detrimental out-of-equilibrium electrons. Using this technique, we studied nuclear spin dynamics in n-GaAs with different doping concentrations. Contrary to simple expectation, the nuclear FR is found to be complex, and consists of two components with vastly different time constants. Two effects at the origin of FR have been identified: the conduction band spin splitting and the localized electron spin polairzation both induced by the Overhauser field. The first effect dominates the FR in both studied samples, while the FR induced by the localized electrons has been observed only in the metallic sample
Dumez, Jean-Nicolas. "Many body dynamics in nuclear spin diffusion." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00657067.
Повний текст джерелаShi, Junhui. "Nuclear spin optical rotation in organic liquids." Thesis, Princeton University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3604505.
Повний текст джерелаNuclear spin induced optical rotation (NSOR) is a novel technique for the detection of nuclear magnetic resonance (NMR) via optical rotation instead of conventional pick-up coil. Originating from hyperfine interactions between nuclei and orbital electrons, NSOR provides a new method to reveal nuclear chemical environments in different molecules. Previous experiments of NSOR detection have poor signal-to-noise ratio (SNR), which limits the application of NSOR in chemistry. In this work, based on a continuous-wave NMR scheme at a low magnetic field (5 G), we employ a multi-pass cavity and a 405 nm laser to improve the sensitivity of NSOR. By performing precision measurements of NSOR detection in a range of pure liquid organic chemicals, we demonstrate the capability of NSOR to distinguish 1H signals in different chemicals, in agreement with the first-principles quantum mechanical calculations. The NSOR of 19F is also measured at low fields with high SNR, showing that heavy nuclei have higher optical rotation signals than light nuclei.
In addition, in order to obtain NSOR at different chemical sites in the same molecule via chemical shift, we make efforts to develop a novel scheme based on liquid-core hollow fiber for the detection of NSOR under high magnetic fields. By coiling a long liquid-core fiber densely for many loops around a small rod combined with RF coils, it is possible to measure optical rotation signals inside a narrow-bore superconducting magnet. Manufactured by filling liquids into capillary tubings, those liquid-core fibers perform like multimode step-index fibers, and thereby exhibit linear birefringence and depolarization, significantly reducing the light polarization for the measurement of optical rotation. According to our attempts, it is possible to suppress the linear birefringence by filling chiral liquids in hollow fibers, and approach near single-mode operation by means of launching light beam into the fiber core under the mode match condition. Although some issues of hollow fibers obstruct the final measurement of high-frequency NSOR, our work on the liquid-core fiber provides the basis for future fiber-based NSOR experiments under high magnetic fields.
Nikolaou, Panayiotis. "SPECTROSCOPIC STUDIES OF NUCLEAR SPINS POLARIZED VIA SPIN EXCHANGE OPTICAL PUMPING AND DYNAMIC COUPLING IN CRYPTOPHANE HOST-GUEST COMPLEXES." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/dissertations/185.
Повний текст джерелаOhlsson, 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.
Повний текст джерелаQC 20100616
Fushitani, Mizuho. "Nuclear Spin Selection Rule in Photoinduced Reaction of Methyl Radical and Nuclear Spin Conversion of Methane in Solid Parahydrogen." 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/150022.
Повний текст джерелаCravey, Robin Lee. "Propagators for higher spin particles." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/27904.
Повний текст джерелаNotbohm, Susanne. "Spin dynamics of quantum spin-ladders and chains." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/403.
Повний текст джерелаNetshiya, Adivhaho Andrew. "Octupole and quadrupole structures in the N=88 nucleus 152Gd." University of the Western Cape, 2018. http://hdl.handle.net/11394/6577.
Повний текст джерелаThe focus for this work is on 152Gd produced by the 150Sm( , 2n)152Gd reaction at a beam energy of 25 MeV. The nucleus has been previously studied for both low spin states and high spin states at di erent energies. The most recent work on 152Gd was done by S. P. Bvumbi using the 152Sm( , 4n)152Gd reaction at a beam energy of 45 MeV where she was able to populate low spin states and assign spins and parities to the levels as shown in Fig. 1.1. The nucleus 152Gd, with proton number Z=64 subshell closure, belongs to a set of isotones having N=88 in the transitional region with just 6 neutrons outside the N=82 closed shell and lies just before the N=90 permanently deformed region. The isotope 152Gd is in the transitional region, consequently its nuclear collective motion will quickly evolve from vibrational to rotational motion. The low lying K =0+2 bands in N=88 and 90 nuclei appear at low excitation energies and are poorly understood. Key to these studies is the crucial question about the legitimacy of the low lying K =0+2 bands being described as vibrations along the symmetry axis. The current work examines the K =0+2 band with the objective of providing more understanding. Previous studies of N=88 isotones saw consistent E1 transitions both from and to the K =0+2 bands and octupole bands, namely 144Ba, 146Ce, 148Nd, 150Sm and 154Dy nuclei. The experimental systematics of the low lying negative parity states in N=88 isotones are remarkably well reproduced by theoretical calculations of the quadrupole octupole coupling (QOC) modelas shown in Fig. 1.2.
Rizzutto, Marcia de Almeida. "Estados de spin elevado em \'ANTPOT.130 La." Universidade de São Paulo, 1989. http://www.teses.usp.br/teses/disponiveis/43/43131/tde-08112013-101544/.
Повний текст джерелаHigh-spin states in the doubly odd nucleus ANTPOT.130 La have been studied using in-beam spectroscopy techinques with fusion evaporation reactions. The ganma rays of ANTPOT.130 La were initially identified by cross-beam reactions ANTPOT.121 Sb (ANTPOT.12 C, 3n) ANTPOT.130 La and ANTPOT.124 Te (ANTPOT.10 B, 4n) ANTPOT.130 La. Excitation functions, angular distributions and --t coincidences were measured using the reaction ANTPOT.121 Sb (ANTPOT.12 C, 3n) ANTPOT.130 La at E IND.BEAM = 54 MeV. Two rotational bands were observed with the configuration h IND.11/2 g IND. 7/2 and h IND.11/2 g IND. 11/2. The second band shows a small signature splitting of 50 KeV which could indicate a slightly triaxial shape. The results will be compared with the framework of Triaxial Rotor plus Two-Quasiparticule Model as well as Cranked Shell Model.
Lv, Bingfeng. "Chirality in the ¹³⁶Nd and ¹³⁵Nd nuclei." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS353/document.
Повний текст джерелаThe exotic collective excitation mode called chirality has been investigated and long-lived isomers have been searched for in the ¹³⁶Nd and ¹³⁵Nd nuclei. Five pairs of nearly degenerate Δ I=1 bands with the same parity have been identified at high spins in ¹³⁶Nd. The observed bands were investigated by the constrained and tilted axis cranking covariant density functional theory and a new developed four single-j shells particle-rotor model. It was found that the properties of these doublet bands are in good agreement with results of the model calculations. Therefore, the multiple chiral doublets (MχD) phenomenon in the nucleus ¹³⁶Nd was confirmed. This was the first experimental evidence for the MχD bands in even-even nuclei. The five pairs of chiral doublet bands is the largest observed in a single nucleus until now. In addition, the level scheme of the ¹³⁶Nd has been extended significantly at low, medium, and very high spins. Possible configurations of all rotational bands have been assigned by using the cranked Nilsson-Strutinsky model. The band structure of ¹³⁶Nd was clarified and the various types of single-particle and collective excitations were well understood. A new pair of positive-parity chiral doublet bands has been identified in ¹³⁵Nd. The characteristics of the doublet bands support the chiral interpretation. Together with the previously reported negative-parity chiral doublet bands show the presence of MχD bands in ¹³⁵Nd. The observed doublet bands were compared with constrained covariant density functional theory and particle-rotor model calculations which nicely reproduce the experimental data, confirming the MχD phenomenon in this nucleus. The newly observed MχD bands in ¹³⁵Nd represent an important milestone in supporting the existence of MχD in nuclei. The search for long-lived isomeric states in ¹³⁵Nd and ¹³⁶Nd has also been performed. This did not lead to the identification of new isomers, but we could confirm the existence of the previously reported isomers in the nuclei ¹³⁸Nd, ¹³⁴Ce, ¹³⁶Pr, and ¹³⁷Pr in our data
Windham, Gordon. "Spin dependence in heavy ion induced nuclear reactions." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/843452/.
Повний текст джерелаSkiba-Szymanska, Joanna. "Electron nuclear spin interaction in semiconductor quantum dots." Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500176.
Повний текст джерелаYeung, R. R. "Nuclear spin relaxation and morphology of solid polyolefins." Thesis, University of East Anglia, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356619.
Повний текст джерелаHarper, R. E. "Anomalous nuclear spin-lattice relaxation peaks in InSb." Thesis, University of St Andrews, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373036.
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