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Meeting agenda:
Discussion of works submitted for the 2023 FLNP Competition
in the section «Applied and Scientific-methodical research»
1. Enhanced directional extraction of very cold neutrons using a diamond nanoparticle powder reflector
E. Lychagin, A. Muzychka, G. Nekhaev, A. Nezvanov, A. Strelkov, K. Zhernenkov
2. Development and creation of the neutron radiography and tomography facility at the WWR-SM research reactor (Tashkent, Republic of Uzbekistan).
B. Abdurakhimov, S. Kichanov, E. Lukin, D. Kozlenko, I. Zel
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"Proposals for the scientific program of the new source NEPTUN in the section “Nuclear physics and fundamental properties of the neutron”"
Fedorov N.A.
The report will present proposals for the scientific program of the new source NEPTUN in the section “Nuclear physics and properties of the neutron”: a review of possible areas of research on neutron-nuclear interactions, fission physics and fundamental properties of the neutron. Possible topics of applied research related to the use of neutron-nuclear reactions will also be considered. An assessment will be made of the feasibility and prospects of conducting certain experiments based on the available information about the reactor parameters and the current state of research in the areas under consideration.
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Agenda:
1. Thesis proposal defense submitted for the degree of Dr. Sci. in Physics and Mathematics on specialty 1.3.2 - "Instruments and methods of experimental physics"
Thesis topic: "Reflectors of very cold and cold neutrons based on ultradisperse diamonds".
Speaker: E. V. Lychagin
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"Flipper-moderator of very slow neutrons and the first steps towards the creation of a UCN source at a pulsed reactor"
A.I. Frank
Apparently, the only way to create a sufficiently intense UCN source at a pulsed reactor of moderate power is to implement the idea of F.L.Shapiro about pulsed filling of UCN traps. To ensure the pulsed nature of the neutron flux at the entrance to the trap, which is remote from the neutron source, it was proposed to use a time lens of one design or another. Later, the concept of a source appeared, based on the combination of a magnetic time lens and a magnetic resonance device that slows down neutrons. A recent analysis has shown that when using a moderating flipper with a sufficiently strong magnetic field, the resulting UCN flux should have a pronounced pulsed structure even in the absence of a time lens. This idea can serve as the basis for the first phase of the UCN source project at the IBR-2 reactor. In addition to obtaining UCN of moderate intensity, the implementation of the proposal will make it possible to test the basic principles of the design of a magnetic time lens and to demonstrate for the first time the method of pulsed filling of UCN traps.
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"Inelastic Neutron Scattering at the Pulsed Neutron Source “NEPTUN""
A. Goremychkin
Inelastic neutron scattering (INS) is a widely used technique for studying condensed matter that allows to obtain detailed data on magnetic and atomic dynamics in a large volume of momentum and energy transfer space. At the beginning of this century, breakthrough developments were carried out in the technology of measurement of inelastic neutron scattering resulting in a radical increase in the quality and quantity of the data obtained by measuring the four-dimensional scattering law function S(Q, ω). Four possible options for the development of general-purpose INS spectrometers for the source “NEPTUN” are considered in the report:
- Thermal neutron direct geometry spectrometer, with a wide Q - ω range and moderate resolution.
- High resolution direct geometry spectrometer at a cold neutron source.
- Thermal neutron inverse geometry spectrometer with a wide range (up to 300 meV) of energy transfers and with a large solid angle of ~6 steradians.
- High resolution inverse geometry spectrometer at a cold neutron source.