Abstract
The electric quadrupole transition from the first state to the ground state in was studied through a lifetime measurement by an upgraded recoil shadow method applied to inelastically scattered radioactive nuclei. The measured mean lifetime is ps, corresponding to a () value of fm, or about 1.5 Weisskopf units. The mean lifetime of the first state in was remeasured to be ps, about four times shorter than the value reported previously. The discrepancy between the two results was explained by incorporating the γ-ray angular distribution measured in this work into the previous measurement. These transition strengths are hindered compared to the empirical transition strengths, indicating that the anomalous hindrance observed in persists in .
6 More- Received 26 November 2007
DOI:https://doi.org/10.1103/PhysRevC.78.014308
©2008 American Physical Society