First evidence for linking transitions between the superdeformed yrast band and the normal deformed states in 149Gd
Finck C., Stézowski O., Kintz N., Vivien JP., Zuber K., Nourreddine A., Appelbe DE., Beausang CW., Beck FA., Byrski T., Courtin S., Curien D., De France G., Duchêne G., Ertürk S., Gall BJP., Haas B., Khadiri N., Pachoud E., Rigollet C., Smith M., Theisen C., Twin PJ.
Double step resolved γ-ray transitions linking the yrast superdeformed (SD) band of 149Gd to the normal deformed (ND) level scheme have been observed using the EUROGAM phase II spectrometer. The excitation energy of the 47/2- SD state above the 7/2- ground state has thus been determined to be 10.625 MeV. The most likely multipolarity of the linking transitions is deduced, which permits the assignment of the most probable spins for this SD band. This measurement represents the first observation of discrete γ-ray transitions linking SD and ND states in the A ∼ 150 mass region of the nuclear chart. © 1999 Elsevier Science B.V. All rights reserved.