Structure of N=81144Eu from the decay of144Gd

Abstract

The structure of 144EU is investigated through the beta decay of 144Gd, whose decay half-life is measured to be (4.47 _+ 0.06) m. A level scheme comprising 67 transitions depopulating 24 excited states is constructed. With the help of the deduced ft values and measured internal conversion coefficients, spin-parity assignments are proposed for several states in 144Eu. This level structure is discussed using the systematics of the odd-A N= 81 and N= 82 isotones which are investigated by a spherical BCS calculation.