βdecay and mass of the new neutron-rich isotopeTi53

The new isotope ${}_{}{}^{53}{}_{}{}^{}\mathrm{Ti}$ has been produced with the ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}({}_{}{}^7{}_{}{}^{}\mathrm{Li}, pn){}_{}{}^{53}{}_{}{}^{}\mathrm{Ti}$ reaction at $E_{{}_{}{}^7{}_{}{}^{}\mathrm{Li}}=14-20\mathrm{}$ MeV. The $\beta$-decay scheme of ${}_{}{}^{53}{}_{}{}^{}\mathrm{Ti}$ was determined from $\gamma$-ray singles and $\gamma -\gamma$ coincidence experiments using high-resolution Ge(Li) and intrinsic germanium detectors. The four strongest decay $\gamma$ rays have energies of 100.8, 127.6, 228.4 (all ± 0.1), and 1675.5 ± 0.3 keV, with relative intensities of 50.9 ± 2.7, 115.4 ± 12.0, 100, and 62.5 ± 6.7, respectively. The ${}_{}{}^{53}{}_{}{}^{}\mathrm{Ti}$ half-life was determined to be 32.7 ± 0.9 sec. Three new levels with excitation energies of 1958, 2550, and 2931 keV were observed in the daughter ${}_{}{}^{53}{}_{}{}^{}\mathrm{V}$. The total ${}_{}{}^{53}{}_{}{}^{}\mathrm{Ti}$ decay energy of 5.02 ± 0.10 MeV was measured by performing a $\beta -\gamma$ coincidence experiment using a plastic scintillation detector for the $\beta$ rays. This yields a ${}_{}{}^{53}{}_{}{}^{}\mathrm{Ti}$ mass excess of -46.84 ± 0.10 MeV. The decay scheme provides $J^{\pi }$ restrictions for the observed states of ${}_{}{}^{53}{}_{}{}^{}\mathrm{V}$, and these are compared with previous measurements and shell model calculations. The measured mass of ${}_{}{}^{53}{}_{}{}^{}\mathrm{Ti}$ is compared with various predictions.