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 βγ -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 ~6He(0_1~+1) → ~6Li(1_1~+0), ~(10)Be(0_1~+1) → ~(10)B(1_1~+0), and ~(14)C(0_1~+1) → ~(14)N(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.