1. B.P. Konstantinov Petersburg Nuclear Physics Institute, NRC “Kurchatov Institute”, Gatchina, Russia;
2. Institute of Macromolecular Compounds, Saint Petersburg, Russia;
3. Ioffe Institute, Saint Petersburg, Russia;
4. Joint Institute for Nuclear Research, Dubna, Russia;
5. Jülich Centre for Neutron Science at Heinz Maier-Leibnitz Zentrum, Garching, Germany