The Levels of ⁹³Zr Populated in the Decay of ⁹³Y

Abstract

The decay of ⁹³Y to the levels in ⁹³Zr has been investigated with the use of Ge(Li), Si(Li), NaI, plastic and anthracene detectors in singles and coincidence experiments. Gamma-ray energies and relative intensities were carefully determined. The resulting decay scheme consists of levels at 267.0, 946.1, 1425.5, 1449.8, 1469.5, 1650.4, 1827.1, 1908.8, 2183.7, 2457.7 and 2474.7 keV. Gamma-gamma directional correlation measurement has been performed for the 679.1–267.0 keV cascade; A₂=−0.0049±0.0213 and A₄=0.020±0.036. The K conversion coefficient was determined for the 267.0 keV transition; α_k=0.022±0.004. The spin-parity of the 267.0 keV level has been determined to be 3/2+. The proposed level scheme was dompared with the prediction of current theoretical calculations.