Персона: Джепаров, Фридрих Саламонович
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Руководитель научной группы "Нейтронная физика"
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Джепаров
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Фридрих Саламонович
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4 results
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- ПубликацияТолько метаданныеCorrection of the Fermi Pseudopotential Concept in the Theory of Dynamic Thermal-Neutron Scattering(2020) Dzheparov, F. S.; Lvov, D. V.; Джепаров, Фридрих Саламонович; Львов, Дмитрий Владимирович© 2020, Pleiades Publishing, Ltd.Abstract: The propagation of thermal neutrons through media characterized by different degrees of ordering is analyzed. It is shown that the standard Fermi pseudopotential concept should be modified in order to obtain a unified description of thermal-neutron propagation in crystalline and amorphous media. It is found that satisfactory results are obtained upon employing a pseudopotential that correctly reproduces the amplitude of scattering on a single center in the second order of perturbation theory rather in the first order. General formulas that describe thermal-neutron propagation through media of arbitrary degree of ordering are derived.
- ПубликацияТолько метаданныеBeta-NMR and Basic Processes in Spin Dynamics(2021) Gulko, A. D.; Dzheparov, F. S.; Lvov, D. V.; Джепаров, Фридрих Саламонович; Львов, Дмитрий Владимирович© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.A review of experimental and theoretical studies of basic processes of spin dynamics in magnetic resonance and relaxation of polarized beta-active nuclei (beta-NMR) is presented. Various problems related to multi-spin and multi-quanta transitions, magnetic resonance in slow fluctuating field and spin transport in disordered media are considered.
- ПубликацияТолько метаданныеNeutron physics investigations of fundamental processes of statistical mechanics(2022) Dzheparov, F. S.; Gulko, A. D.; Elyutin, N. O.; Lvov, D. V.; Shestopal, V. E.; Джепаров, Фридрих Саламонович; Львов, Дмитрий ВладимировичStudies in spin dynamics of disordered media and multiple ultra-small angle neutron scattering are considered. The experiments were carried out on unique installations designed in ITEP laboratory of neutron physics: beta-NMR spectrometer and universal neutron diffractometer. The main attention is paid to random walks in disordered systems and ultra-small angle neutron scattering (USANS) on objects with space correlations in positions of scatterers. Synthesis of concentration expansion, semi-phenomenological theory and numerical simulations produced satisfactory description of the nuclear polarization transfer within disordered 8Li-6Li spin subsystem in LiF single crystal. The theory of USANS starts from eikonal approximation for the scattering amplitude, which (a) reproduces the phenomenological Moliere-Bethe theory for the observable neutron angular distributions for uncorrelated random positions of scatterers, and (b) gives a possibility to take into account their spatial correlations. © 2022 World Scientific Publishing Company.
- ПубликацияТолько метаданныеNeutron Propagation through a Sample Oscillating along the Neutron Beam(2022) Dzheparov, F. S.; Lvov, D. V.; Frank, A. I.; Джепаров, Фридрих Саламонович; Львов, Дмитрий Владимирович