Peculiarities of neutron waveguides with thin Gd layer

6th European Conference on Neutron Scattering

Khaydukov, Yu^1,2,3 ; Kravtsov, E.^4,5 ; Progliado, V.^4 ; Ustinov, V.^4 ; Nikitenko, Yu^6 ; Keller, T.^1,2 ; Aksenov, V.^7 ; Keimer, B.^1

Max-Planck-Institut für Festkörperforschung, Stuttgart

D 70569, Germany^1

Max Planck Society Outstation at the FRM-II, Garching

D-85747, Germany^2

Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow

119991, Russia^3

Institute of Metal Physics, Ekaterinburg

620990, Russia^4

Ural Federal University, Ekaterinburg

620002, Russia^5

Joint Institute for Nuclear Research, Dubna

141980, Russia^6

Petersburg Nuclear Physics Institute, Gatchina

188300, Russia^7

关键词: Absorbing layers;    Domain formation;    Magnitude enhancement;    Neutron density;    Poisoning effects;    Reactor physics;    Standing wave;    Superconducting state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012064/pdf
DOI  :  10.1088/1742-6596/746/1/012064

来源: IOP

【 摘 要 】

Peculiarities of the formation of a neutron enhanced standing wave in the structure with a thin highly absorbing layer of gadolinium are considered in the article. An analogue of the poisoning effect well known in reactor physics was found. The effect is stronger for the Nb/Gd/Nb system. Despite of this effect, for a Nb/Gd bilayer and a Nb/Gd/Nb trilayer placed between Al2O3substrate and Cu layer, it is shown theoretically and experimentally that one order of magnitude enhancement of neutron density is possible in the vicinity of the Gd layer. This enhancement makes it possible to study domain formation in the Gd layer under transition of the Nb layer(s) into the superconducting state (cryptoferromagnetic phase).