Structure of148Sm studied from the decay of148Pm and148mPm

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Abstract
Gamma-gamma directional correlation and coincidence techniques employing Ge(Li)-NaI(Tl) and Ge(Li)-Ge(Li) systems were used to investigate the de-excitation mechanism and character of several states in 148Sm following the decay of 148Pm and 148mPm. The radioactive source was produced by a (pmn) reaction on mass-separated 148Nd using the high proton-current facilities of the NRC Demokritos Tandem Van de Graaff accelerator. The spins of certain already known or newly established levels together with the multipole mixing ratios of the transitions connecting them were determined. The results indicate that the high-spin positive parity states are not of collective character.