Neutron Spin Manipulations with Magnetic Fields

1 Neutron Spin Manipulations with Magnetic Fields 

The motion of the neutron polarization P(t) - the quantum mechanical expectancy value of neutron spin - is described by the Bloch equation 

The second important spin-angular operation is the 90° rotation where the polarization is transformed from the z to the x direction or vice versa. A Mezei coil in the x,z plane is adjusted such that the resultant field points exactly in the direction of the bisection of the angle between x and z. A 180° rotation around this axis transforms the z component of polarization to the x direction. At the same time, the sign of the y component is inverted (Fig. lc). 

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