Backbending and $Gamma$-Vibrations

Abstract

We propose that the backbending phenomenon can be explained as a result of the disappearance of collective $gamma$-vibrational mode in the rotating frame. Using a cranking+random phase approximation approach for the modified Nilsson potential + monopole pairing forces, we show that this mechanism is responsible for the backbending in ${}^{156}$Dy, ${}^{158}$Er and obtain a good agreement between theoretical and experimental results.

5 pages, 4 figures, published version