A new variant of the P-odd asymmetry measurement in extracted beams of nuclear reactors

Abstract

We present the results of test runs on a new system intended for the P-odd asymmetry measurement using the integral method of detecting events for the neutron polarization switching frequency (f) above the fundamental frequencies of the fluctuation power spectrum of a reactor. The dependence of the error of the P-odd asymmetry measurement in the γ quantum yield of the ¹⁰B(n, α)⁷Li* ⟹ γ ⟹ ⁷Li(g.s.) reaction on f has been studied. It is established for the first time that an increase in f leads to a sharp decrease in the error of asymmetry measurement for a single detector and, beginning with f ∼ 15 Hz, this error ceases to depend on the reactor power fluctuations.