Conversion-electron spectroscopy and gamma-gamma angular correlation measurements in ¹¹⁶Sn

Abstract.

The ¹¹⁶Sn nucleus was studied via the $\beta^{-}$ decay of ¹¹⁶In utilizing the $8\pi$ spectrometer and its auxiliary detectors at TRIUMF-ISAC. The resulting K-shell conversion coefficients, K/L ratios, and multipole mixing ratios are presented. The $2_{3}^{+} \rightarrow 2_{1}^{+} 931$ keV and $2_{2}^{+} \rightarrow 2_{1}^{+} 819$ keV transition mixing ratios were re-measured and found to be $\delta = +1.8_{-0.5}^{+0.7}$ and $-1.83(8)$, respectively. Newly measured mixing ratios for transitions among the low-lying $I^{\pi} = 4^{+}$ states in ¹¹⁶Sn, when combined with $\gamma$-ray intensity data, suggest that the 2529 keV $4_{2}^{+}$ state possesses a neutron broken-pair admixture in addition to its dominant proton 2p-2h component.