  A new concept is proposed to solve the solar neutrino problem, that is based
on a hypothesis about the existence of a new interaction of electron neutrinos
with nucleons mediated by massless pseudoscalar bosons. At every collision of a
neutrino with nucleons of the Sun, its handedness changes from left to right
and vice versa, and its energy decreases. The postulated hypothesis, having
only one free parameter, provides a good agreement between the calculated and
experimental characteristics of all five observed processes with solar
neutrinos.
