Spectroscopic Studies Of Neutron-Rich In-129 And Its Beta-Decay Daughter, Sn-129, Using The Griffin Spectrometer

The beta decay of neutron-rich In-129 into Sn-129 was studied using the GRIFFIN spectrometer at the ISAC facility at TRIUMF. The study observed the half-lives of the ground state and each of the beta-decaying isomers. The level scheme of Sn-129 has been expanded with thirty-one new gamma-ray transitions and nine new excited levels, leading to a reevaluation of the beta branching ratios and level spin assignments. The observation of the beta decay of the (29/2(+)) 1911-keV isomeric state in In-129 is reported for the first time, with a branching ratio of 2.0(5)%.