Reflection-asymmetric structures in Ra-225 from gamma-ray spectroscopy study of Th-229 alpha decay - art. no. 064305

The level structure of Ra-225, produced in alpha decay of Th-229, was studi ed by gamma -ray spectroscopy. The sources were continuously purified from daughters with ion-exchange chromatographic separation methods. Energies an d intensities of 174 gamma rays were accurately measured with HPGe detector s. About 100 gamma rays were reported for the first time, especially in the 300-700 keV energy range. A Ra-225 level scheme was proposed, accounting f or about 200 transitions among 45 excited states. The level structure was i nterpreted in the framework of reflection-asymmetric structures with parity doublet bands. The model was shown to be in satisfactory agreement with ex perimental data.