Spin-isospin excitations in ${}^{12}$B and ${}^{12}$N have been studied using the ${}^{12}$C$(d$,${}^2$He)${}^{12}$B and ${}^{12}$C${(}^3$He,$t)$${}^{12}$N charge-exchange reactions at $\theta$ = 0$°$ and at $E_d$=200 MeV and $E$${(}^3$He)=450 MeV, respectively. Neutron decay from ${}^{12}$B to ${}^{11}$B and proton decay from ${}^{12}$N to ${}^{11}$C have been measured with detector arrays consisting of liquid-scintillation counters and silicon detectors, respectively. Microscopic structures of the spin-dipole resonances in ${}^{12}$B and ${}^{12}$N are discussed on the basis of the experimental observations of particle decays and their angular correlations.

• Received 22 December 1997

DOI:https://doi.org/10.1103/PhysRevC.57.3153