Abstract
E2/M1 mixing ratios have been measured for transitions from states in the γ vibrational bands (Iγ+) to states in the ground state bands (I+ or [ I- 1 ] +) of the neutron rich, even-even, deformed isotopes, 102, 104, 106, 108Mo, 108, 110, 112Ru, and 112, 114, 116Pd, including from states as high as 9γ+. These measurements were done using the GAMMASPHERE detector array, which, at the time of the experiment, had 101 working HPGe detectors, arranged at 64 different angles. A 62 μCi source of 252Cf was placed inside GAMMASPHERE yielding 5. 7 × 10 11γ-γ-γ and higher coincidence events. The angular correlations between the transitions from the γ-bands to the ground bands, and the pure E2 transitions within the ground band were then measured. These angular correlations yielded the mixing ratios, demonstrating that these transitions are pure or nearly pure E2, in agreement with theory. In order to correct for possible attenuation due to the lifetime of the intermediate state in these correlations, the g-factors of the intermediate states needed to be known. Therefore, the g-factors of the 2+ states in the ground state band have been measured.
| Original language | English |
|---|---|
| Article number | 15 |
| Journal | European Physical Journal A |
| Volume | 54 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1 2018 |
| Externally published | Yes |
Funding
The work at Vanderbilt University and Lawrence Berkeley National Laboratory is supported by the U.S. Department of Energy under Grant No. DE-FG05-88ER40407 and Contract No. DE-AC03-76SF00098. The work at Tsinghua University was supported by the National Natural Science Foundation of China under Grant No. 1175095. The work at JINR was partly supported by the Russian Foundation for Basic Research Grant No. 08-02-00089 and by the INTAS Grant No. 2003-51-4496.