Multipole Mixing Ratios in the Decay of 133ba from Triple-γ Directional Correlation Measurements

Authors

V. R. Potnis, Michigan Technological University
G. P. Agin, Michigan Technological University
B. P. Singh, Michigan Technological University

Document Type

Article

Publication Date

3-25-1985

Department

Department of Physics

Abstract

The multipole mixing ratios of the 53.17 and 302.85 keV transitions in ¹³³Cs are measured through γ → γ → γ angular correlation experiments using one NaI(Tl) and two Ge(Li) detectors. Angular correlations for the cascades 276.40 keV → 79.63 keV (θ variable) → 81.00 keV, 276.40 keV → 79.63 keV → 81.00 keV (θ variable), and 53.17 keV → 302.85 keV → 81.00 keV (θ variable) were investigated. The data were analyzed assuming the presently accepted J^π sequence of 72⁺, 52⁺, 52⁺, 32⁺, and 12⁺ for the ground state and the 81.00, 160.63, 383.82, and 437.00 keV levels in ¹³³Cs, respectively, and taking the 276.40 keV transition to be pure E2, the 81.00 keV transition to be M1 + 2.8% E2, and the 53.17 keV transition to be M1 + 1.0% E2. The multipole mixing ratios σ are determined to be + 0.171_-0.050^+0.051 for the 79.63 keV transition and + 0.022 for the 302.85 keV transition. Phases of the mixing ratios of the 81.00, 79.63, and 302.85 keV transitions are adopted after a critical analysis of the data. The present experiment has determined the mixing ratios, along with the phases, free of errors due to angle-dependent Compton distributions of interfering γ-ray cascades.

Publisher's Statement

© 1985

Publication Title

Nuclear Physics A

Recommended Citation

Potnis, V., Agin, G., & Singh, B. (1985). Multipole Mixing Ratios in the Decay of 133ba from Triple-γ Directional Correlation Measurements. Nuclear Physics A, 436(1), 93-107. http://doi.org/10.1016/0375-9474(85)90543-3
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/5684