Time-reversal test and nuclear-structure study usingAgm110

The decay of oriented ${}_{}{}^{110}{}_{}{}^{}\mathrm{Ag}_{}^m{}_{}{}^{}$ has been studied through singles and coincidence counting. The nuclear polarization was obtained by using a dilution refrigerator and the hyperfine field in iron. Ge(Li) singles spectra yielded the following $\frac{E2\mathrm{}}{M1\mathrm{}}$ mixing ratios: $\delta \left(447\mathrm{} \mathrm{keV}\right)=-0.40\mathrm{}\pm 0.06$, $\delta \left(678\mathrm{} \mathrm{keV}\right)=-0.36\mathrm{}\pm 0.03$, $\delta \left(687\mathrm{} \mathrm{keV}\right)=-1.65\mathrm{}\pm 0.09$, $\delta \left(707\mathrm{} \mathrm{keV}\right)=-1.42\mathrm{}\pm 0.07$, $\delta \left(1384\mathrm{} \mathrm{keV}\right)=-0.39\mathrm{}\pm 0.02$, $\delta \left(1505\mathrm{} \mathrm{keV}\right)=-1.09\mathrm{}\pm 0.09$. In a time-reversal invariance test the phase angles $\eta$ of the mixing ratio $\delta =\left|\delta \right|e^{i\eta }$ were measured through the observation of $\gamma -\gamma$ directional correlations in the daughter ${}_{}{}^{110}{}_{}{}^{}\mathrm{Cd}$. Three NaI detectors allow six coincidence combinations to be measured for both the 1505-658 keV and the 1384-(885)-658 keV cascades. We found $sin\eta \left(1505\mathrm{} \mathrm{keV}\right)=(1.5\mathrm{}\pm 2.2)\times {10}^{-3\mathrm{}}$ and $sin\eta \left(1384\mathrm{} \mathrm{keV}\right)=(-1.7\mathrm{}\pm 5.1)\times {10}^{-3\mathrm{}}$, consistent with time-reversal invariance. The $g$ factor of the 658 keV state in ${}_{}{}^{110}{}_{}{}^{}\mathrm{Cd}$ was determined to be 0.28 ± 0.05.