  The cross sections of the nuclear reactions induced by neutrons at $E_n$=
14.6 MeV on the isotopes of Dy, Er, Yb with emission of neutrons, proton and
alpha-particle are studied by the use of new experimental data and different
theoretical approaches. New and improved experimental data are measured by the
neutron-activation technique. The experimental and evaluated data from EXFOR,
TENDL, ENDF libraries are compared with different systematics and calculations
by codes of EMPIRE~3.0 and TALYS~1.2. Contribution of pre-equilibrium decay is
discussed. Different systematics for estimations of the cross-sections of
considered nuclear reactions are tested.
