Bragg resonance behavior of the neutron refractive index and crystal acceleration effect

6th European Conference on Neutron Scattering

Braginetz, Yu.P.^1,2 ; Berdnikov, Ya.A.^2 ; Fedorov, V.V.^1,2,3 ; Kuznetsov, I.A.^1 ; Lasitsa, M.V.^1,2 ; Semenikhin, S.Yu.^1 ; Vezhlev, E.O.^1,4 ; Voronin, V.V.^1,2,3

Petersburg Nuclear Physics Institute NRC KI, Gatchina, Leningrad district

188300, Russia^1

Peter the Great St.Petersburg Polytechnic University, 29 Polytechnicheskaya st., St.Petersburg

195251, Russia^2

St.Petersburg State University, 7/9 Universitetskaya nab., St.Petersburg

199034, Russia^3

Forschungszentrum Jülich GmbH, Germany^4

关键词: Acceleration effects;    Bragg conditions;    Bragg resonance;    Energy dependence;    Neutron refraction;    Neutron time of flight;    Perfect crystals;    Refraction index;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012052/pdf
DOI  :  10.1088/1742-6596/746/1/012052

来源: IOP

【 摘 要 】

The energy dependence of neutron refraction index in a perfect crystal for neutron energy, close to the Bragg ones, was studied. The resonance shape of this dependence with approximately the Darwin width was found. As a result, the value of deviation from the exact Bragg condition can change during the neutron time of flight through the accelerated crystal and so the refraction index and the velocity of outgoing neutron can change as well. Such new mechanism of neutron acceleration in the accelerating perfect crystal was proposed and found experimentally. This mechanism is march more effective then known one concerning with the neutron acceleration in the accelerating usual media.