Gamow-Teller transitions from ${}^{9,11}$Li to ${}^{9,11}$Be

Abstract

Gamow-Teller(GT) transitions in the $\beta$ decays of ${}^9$Li and ${}^{11}$Li are investigated with theoretical calculations of antisymmetrized molecular dynamics. The calculated $B(GT)$ values are small for transitions to low-lying states in Be isotopes, while relatively large $B(GT)$ values are found for excited states at excitation energy $E_x\ge 10$ MeV. Sum of the $B(GT)$ values are discussed for each spin parity of final states. The calculated results seem to be inconsistent with the experimental report of the strongest GT-transition from ${}^9$Li to the $5/2^{-}$ state at 11.8 MeV of ${}^9$Be.