Abstract:

An angular-correlation setup was applied to measure the e-γ angular correlations involving the 570- and 1064-keV transitions in Pb207. The use of a Si(Li) semiconductor counter as an electron detector allowed the separation of the three K, L, and M conversion lines for both transitions. γ-γ angular correlations were also performed. Particle parameters b2 were thus esperimentally determined. The values obtained for the K, L, and M shells were 1.19(7), 1.13(7), and 1.41(11) for the 570-keV transition and 1.05(5), 1.06(12), and 1.16(15) for the 1064-keV transition. Particle parameters b4 were calculated from the b2 values through a recursion relation. The coefficients A4(e) could not be determined directly from experiment owing to the lack of statistics, but they were obtained through the b4 particle parameters and the A4(γ) coefficients. The values for the K, L, and M shells one -0.020(8), -0.025(9), and ∼-0 are for the e(570)-γ(1064) angular correlations; and -0.049(16), -0.051(30), and -0.072(40) for the e(1064)-γ(570) angular correlations. © 1970 The American Physical Society.