Quantised orbital alignment and Identical High-K Bands in A=180 region

Abstract

The origin of the identical gamma-ray energies (IB) observed in the K=33/2${}^{+}$ and K=16${}^{+}$ bands in ${}^{177}$Lu and ${}^{178}$Hf respectively is investigated using deformed Hartree-Fock and Angular Momentum Projection technique. We find that quantised orbital (rather than spin) alignment of protons in the m=1/2${}^{+}$ inert orbit leads to identical energy spectra. A K=16${}^{+}$ band with identical spectrum is predicted in ${}^{176}$Yb at 4.48 Mev of excitation.

4 pages 4 figures 1 table