Персона: Львов, Дмитрий Владимирович
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On the Possibility of Observing the Effect of Anomalous Neutron Transmission in Predominantly Resonance Absorption by Perfect Crystals of InSb
2019, Elyutin, N. O., Abov, Y. G., Lvov, D. V., Tyulyusov, A. N., Львов, Дмитрий Владимирович, Тюлюсов, Антон Николаевич
© 2019, Pleiades Publishing, Ltd.Dynamic neutron diffraction on perfect InSb crystals is analyzed theoretically both under conditions of predominantly potential scattering and under conditions of predominantly resonant scattering. Attention is given primarily to the effect of anomalous neutron transmission. A project of an experiment aimed at studying this effect in predominantly resonant neutron scattering via a simultaneous detection of reflected and transmitted beams and secondary gamma rays is proposed. It is shown that such an experiment may be performed in beams from high-flow reactors.
Correction 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.
Beta-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.