The MULTI spectrometer for measurement of β-decay process in exotic nuclei Ivan Siváček, Sergey Stukalov, Yuri Sobolev, Dmitry Testov, Vladimir Smirnov, Yuri Penionzhkevich and Zhasulan Zeinulla EPJ Web Conf., 253 (2021) 01003 Published online: 19 November 2021 DOI: 10.1051/epjconf/202125301003