Method of the polarized beams

Two successive scattering experiments are made with the same sample and beams with different polarizations. In the sample, the nuclei have random orientations. 

In the first experiment, the incident neutrons are totally depolarized (see Section 4.4.1.1). In this case 

In the second experiment, the incident beam is totally polarized the spin of each neutron points in the same direction, denoted by (s = 1/2). Moreover, the scattered flux is filtered through an analyzer before falling on the detector only the neutrons, with spins pointing in the direction denoted by J. (s = — 1/2), opposite to the direction T are counted. In this case, as was shown in a preceding section [see (6.4.38) and (6.4.34)], we have 

4- deuterated PSS, non-deuterated TMA x non-deuterated PSS, non-deuterated TMA A non-deuterated PSS, deuterated TMA O deuterated PSS, deuterated TMA 

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