The second 2 state inSm and the decay ofEu.

The positron decay ofEu is reinvestigated using beta- and gamma-ray spectroscopy techniques. A decay scheme comprising three excited states and four transitions inSm is constructed. Three new transitions are observed and have led to the establishment of a second 2 state populated in this decay. The half-life ofEu has been accurately measured to be 10.2±0.1 s. Spin-parity assignments are made to all the levels involved in the decay. The structure ofSm is discussed in the light of different models. [ABSTRACT FROM AUTHOR]