Half-Life and Magnetic Moment of the First Excited State in $^{132}$I

The half-life and the magnetic moment of the first excited state in $^{132}$I are reported. There have been a long time confusion on the half-life measurements of the first excited state in $^{132}$I. Several groups performed the lifetime measurements, but the reported values range from 1 ns to 7 ns. The only reported value of the magnetic moment for this state was measured by Singh, but their result should be treated as unreliable because the time-integral perturbed angular correlation technique (TIPAC), which requires the life time data of this state, was used in their measurement. From this point of view, the half-life and the magnetic moment of this state were measured. $^{132}$I was obtained as the radioactive beam of $^{132}$Te and $^{132}$Sb from the newly developed RF-IGISOL (Radio Frequency IGISOL system) at Tohoku University. The half-life for this state was determined to be 1.120 $\pm $ 0.015 ns by a conventional coincidence technique with a pair of BaF$_{2}$ detectors. The TDPAC measurement for the $^{132}$I implanted kinematically into nickel was performed with the help of a strong hyperfine field at iodine site in nickel, and the magnetic moment of this state was determined to be $\mu $=+ (2.06 $\pm $ 0.18)$\mu _{N}$. The configuration of this state based on the present results will be discussed.