Observation of parity nonconservation in the total cross section and in the cross section for the radiative capture of polarized thermal neutrons in 79,81 Br
Vesna V.A , Kolomenskii E.A., Lobashev V. M. , Pirozhkov A. N., Smotritskii L. M. , Titov N. A.
Parity (Ρ) nonconservation effects have been measured in the total and radiative cross sections in 79'81Br: (σ+ σ-)/(σ+ + σ") = (9.8± 1.0) · 10~Vtot) = 15.5 b and (σ+ -σ~)/(σ+ +σ~) = (15.5±1.5)X 10"Vy =9.8 b, where the ± correspond to opposite neutron helicities. It follows from the results that the P-odd effect in the total cross section is determined by radiative capture, within the experimental error.