The neutron was determined to have a magnetic moment by indirect methods in the mid 1930s. 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This analogy does hold, since an electron indeed behaves like a tiny bar magnet. /Length 5998 Neutron magnetic mirrors and guides use this total internal reflection phenomena to control beams of slow neutrons. These forces are equivalent in magnitude, but opposite in direction and they form a parallel couple that rotates the magnet clockwise and creates a net torque on the magnet because of the individual force in a couple; thus we have torque acting on the bar magnet. Since the neutron has no charge, it should have no magnetic moment by this expression. This derivation yields a term from the electron spin coefficient x, … [13][17] By the late 1930s, accurate values for the magnetic moment of the neutron had been deduced by the Rabi group using measurements employing newly developed nuclear magnetic resonance techniques. In particular, the magnetic moment of the neutron is used to determine magnetic properties of materials at length scales of 1–100 Å using cold or thermal neutrons. where μs is the magnetic moment resulting from the spin of an electron, S is its spin angular momentum, and