Detailed spectroscopy of doubly magic 132Sn
Abstract
The structure of the doubly magic 13250Sn82 has been investigated at the ISOLDE facility at CERN, populated both by the β-decay of 132In and β--delayed neutron emission of 133In. The level scheme of 132Sn is greatly expanded with the addition of 68 γ-transitions and 17 levels observed for the first time in the β decay. The information on the excited structure is completed by new γ-transitions and states populated in the β-n decay of 133In. Improved delayed neutron emission probabilities are obtained both for 132In and 133In. Level lifetimes are measured via the Advanced Time-Delayed βγγ(t) fast-timing method. An interpretation of the level structure is given based on the experimental findings and the particle-hole configurations arising from core excitations both from the N = 82 and Z = 50 shells, leading to positive and negative parity particle-hole multiplets. The experimental information provides new data to challenge the theoretical description of 132Sn.