We propose three kinds of modified neutron spin echo methods using cold neu
tron spin interferometry, which is based on the coherent superposition prin
ciple of the neutron spin. Two kinds of the modified methods are based on a
novel quantum precession of neutron spin by multilayer spin splitters and
another method on time dependent spin interferometry using RF flippers, The
performances of the last type are discussed and the firmer two methods are
described in other proceedings. (C) 1999 Elsevier Science Ltd. All rights
reserved.