Search for enhanced octupole correlations inGe65

Level structure ofSe69

“…3. With such a large value of ␦ for the 773.3-keV transition, we assume a mixed E2/ M1 character and a spin of 13/ 2 + for the 2023.8-keV level, in agreement with the systematics of the light germanium isotopes [31,33,35]. A spin of 13/ 2 + for the 2023.8-keV level is also consistent with the results of the directional correlations analysis for the 1203.3-, 448.2-, and 1183.2-keV transitions populating the level.…”

“…The states 15/ 2 − , 19/2 − , and 23/ 2 − at 3205.6-, 3673.6-, and 4387.8-keV excitation energies may be interpreted as the g 9/2 particle or hole coupled to the 3 − , 5 − , and 7 − states in the neighboring even-even nuclei 68,70 Se [10,55]. Such a coupling picture follows the trend observed within the chain of Ge isotopes between 64 Ge and 70 Ge which suggested their interpretation in the framework of the weak-coupling model [31,33]. The energies of these states agree very well with the energies of the corresponding core states in 70 Se, while the tentatively assigned analogous states in 68 Se are about 200-300 keV higher in energy.…”

“…In the analysis, the computer code CHIPLO-2 has been used [30]. A mean value for / I i = 0.35± 0.03 was found to minimize the 2 function and to reproduce the angular distribution coefficients given in the literature [31,32]. This value has been used as a reference value for the final analysis of the angular distribution measurements.…”