  The possibility of the determination of the neutron mean square charge radius
from high-precision thermal-neutron measurements of the nuclear scattering
length and of the scattering amplitudes of Bragg reflections is considered.
Making use of the same interferometric technique as Shull in 1968, the
scattering amplitudes of about eight higher-order Bragg reflections in silicon
could be measured without contamination problem. This would provide a value of
the neutron charge radius as precise as the disagreeing Argonne-Garching and
Dubna values, as well as a Debye-Waller factor of silicon ten times more
precise than presently available.
