Measurement of spin-precession angles of resonant tunneling neutrons - art. no. 013607

We have succeeded in precisely measuring spin-precession angles of tunnelin g and nontunneling neutrons through double-rectangular, triple-rectangular, and multirectangular potential barriers represented by a [Permalloy45(PA)- germanium(Ge)](n)-PA Fabry-Perot magnetic thin-him resonator for n =1, 2, a nd 10, respectively. The spin-precession angle due to the Fabry-Perot reson ator shows the oscillation curve as a function of the incident angles, and the curve is well reproduced by the theoretical phase difference of up arro w and down arrow spin neutron wave functions based on the one-dimensional S chrodinger equation. We demonstrate that the amplitude of the curve is prop ortional to the number of germanium layers (wells) although the transmissio n probability remains constant.