States in 116Sb from 116Te decay and 116Sn(p,nγ)116Sb

The 116Te beta decay and the 116Sn(p,nγ)116Sb reaction with proton beam energies between 5.95 and 11.75 MeV have been used with Ge(Li) spectrometers to study properties of γ rays from states of 116Sb below 1.48 MeV of excitation. The beta decay of 116Te is observed to directly feed four excited levels in 116Sb. The de-excitation of these levels produce 21 γ rays allowing the placement of four additional levels. These eight states and 25 others were observed in the (p,nγ) experiments. Using the predictions of the statistical compound nuclear model, spin and some parity assignments have been made based upon in-beam gamma-ray angular distributions and excitation functions in conjunction with the beta decay. These states and spin-parity are 0.0 (3+), 93.7 (1+), 103.0 (2+), 410.9 (4+), 455.2 (3), 466.0 (3), 503.1 (5), 517.9 (2+), 550.9 (2), 574.4 (2+), 612.5 (4), 654.1 (3), 731.6 (1+), 815.1 (3), 820.6 (5), 841.1 (6), 881.5 (3), 917.7 (1+), 948.0 (4), 1127.2 (2), 1158.3 (1+), 1222.9 (2) keV. Branching ratios for 42 γ rays are presented along with all measurements of the multipole mixing ratio. Pulsed beam experiments have been performed to measure the half-lives of the excited states. The lifetime of the 455.2 keV state is discussed. The shell model structure of low lying states is also discussed