Abstract
Experiments are considered that are devoted to studying neutron-spin dynamics (that is, neutron-spin rotation) in the resonance elastic scattering of polarized neutrons on nuclei of lead isotopes and on their natural mixture. It is shown that the effect measured traditionally includes a true spin rotation upon the transmission through a sample and some addition associated with the instrumental error of the method. An estimate of this error and its validation, which were used, for the first time, to determine the effect on 204Pb, are given. Some measures to refine and expand relevant experimental procedure are proposed with the aim of performing a more thorough and a more diversified investigation of elastic neutron scattering on a nucleus. A program of investigations for all lead isotopes is outlined. Such investigations are of importance in connection with the possible existence of a previously unknown negative-energy P-wave neutron resonance in neutron capture by a 204Pb nucleus.
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