1206.2156 (Eunja Ha et al.)

High-lying Gamow-Teller excited states in the deformed nuclei of 76Ge and 82Se by the Deformed Quasi-particle RPA (DQRPA)    [PDF]

Eunja Ha, K. S. Kim, Myung-Ki Cheoun

With the advent of high analysis technology in detecting the Gamow-Teller (GT) excited states beyond 1 nucleon emission threshold, the quenching of the GT strength to the Ikeda sum rule seems to be recovered by the high-lying GT states. Moreover, in some nuclei, the stronger peaks than any other peaks in lower excited states appear explicitly. We address that these high-lying GT excited states stems from the smearing of the Fermi surface by the increase of the chemical potential due to the deformation within a framework of the deformed quasi-particle random phase approximation (DQRPA). Detailed mechanism leading to the smearing is discussed and comparisons to the available experimental data are shown to nicely explain the strong peaks on the high-lying GT excited states.

View original: http://arxiv.org/abs/1206.2156