Gamow-Teller transitions and proton-neutron pair correlation in N = Z odd-odd p-shell nuclei

摘要

We have studied the Gamow-Teller (GT) transitions from N = Z + 2 neighbors to N = Z odd-odd nuclei in the p-shell region by using isospin-projected and beta gamma-constraint antisymmetrized molecular dynamics combined with the generator coordinate method. The calculated GT transition strengths from 0(+)1 states to 1(+)0 states such as He-6(0(1)(+)1) -> Li-6(1(1)(+)0), Be-10(0(1)(+)1) -> B-10(1(1)(+)0), and C-14(0(1)(+)1) -> N-14(1(2)(+)0) exhaust more than 50% of the sum rule. These N = Z + 2 initial states and N = Z odd-odd final states are found to dominantly have S = 0, T = 1 nn pairs and S = 1, T = 0 pn pairs, respectively. Based on the two-nucleon (NN) pair picture, we can understand the concentration of the GT strengths as the spin-isospin-flip transition nn(S = 0, T = 1) -> pn(S = 1, T = 0) in LS coupling. The GT transition can be a good probe to identify the spin-isospin partner states with nn pairs and pn pairs of N = Z + 2 and N = Z odd-odd nuclei, respectively.