A. A. Lamaka
A.N. Sevchenko Institute of Applied Physical Problems of Belarusian State University
Belarus

Address for correspondence:
Lamaka A.A.–
A.N. Sevchenko Institute of Applied Physical Problems of Belarusian State University,
Kurchatov str., 7, Minsk 220045, Belarus
 e-mail: alekseylomako@gmail.com

A. V. Gutarau
A.N. Sevchenko Institute of Applied Physical Problems of Belarusian State University
Belarus

Kurchatov str., 7, Minsk 220045

N. G. Shcherbakou
A.N. Sevchenko Institute of Applied Physical Problems of Belarusian State University
Belarus

Kurchatov str., 7, Minsk 220045

P. V. Ivuts
A.N. Sevchenko Institute of Applied Physical Problems of Belarusian State University
Belarus

Kurchatov str., 7, Minsk 220045