Shape evolution with increasing angular momentum in the 66Ga nucleus
Abstract
The high-spin nuclear structure of the odd-odd 66Ga nucleus was probed using heavy-ion induced fusion-evaporation reaction. The de-exciting γ rays were detected by using the Indian National Gamma Array (INGA) consisting of high resolution Compton suppressed clover detectors. The level scheme of 66Ga was extended up to an excitation energy (Ex) of ∼10.6 MeV with spin parity of 21(+). Two new quadrupole bandlike structures, one positive and one negative parity, based on the states having spin parity of Jπ=11+ and 10-, respectively, were found. The experimental energy levels are compared with calculations within the framework of shell model calculation using j j 44 b p n effective interaction. The agreement between experiment and theory is good. The total Routhian surface calculations were performed to understand the shape of the 66Ga nucleus associated with the configurations ν (g9 /2)3ν (f5 /2)2π (g9 /2)1π (f5 /2)2 and ν (g9 /2)2ν (f5 /2)1π (g9 /2)1π (f5 /2)2 assigned to the positive and negative parity bands, respectively. In the frequency domain ω =0.20 -0.30 MeV, both the negative and positive parity quadrupole structures, favor prolate deformation whereas at ω =0.50 MeV there is a sudden change to noncollective oblate shape in both the bands.
- Publication:
-
Physical Review C
- Pub Date:
- May 2017
- DOI:
- 10.1103/PhysRevC.95.054330
- Bibcode:
- 2017PhRvC..95e4330B