Abstract
The effect of neutron-spin rotation due to the parity-nonconserving interaction of neutrons with nuclei in a lead sample enriched in the 204Pb isotope had been measured up to the end of 1999. The problem that initiated the experiment was the earlier observed effect of neutron-spin rotation in natural lead and futile attempts at discovering this effect in isotopes constituting natural lead. At present, the final data processing has been completed. A simple model of the experiment is proposed and considered. After a careful consideration, some possibility of evaluating the instrumental error is revealed and successfully used in the array of the data obtained. The result obtained for the neutron-spin-rotation angle in a lead sample is (8±2)×10−5 rad/cm for lead containing 100% 204Pb. This value corresponds to the proposition that the presence of 204Pb is responsible for the observed effect of neutron-spin rotation in natural lead.
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