Measurements of self-diffusion in bcc He-3 24,20-24,80 cm(3)/mole were
carried out by a new method in the temperature range 0.4 - 0.8 K. The
vacancy diffusion coefficient was obtained by comparison of the self-
diffusion data and the vacancy specific heat It is found out that the
vacancy diffusion is independent of temperature, because of spin disor
der in this region. The data obtained shows that vacancies in bcc He-3
are wide-gap quasiparticles.