Gamow-Teller Transition Strength - Isospin Symmetry In A = 26 Isobars

Under the assumption that isospin is a good quantum number, isospin symmetry is expected for the Tz = ±1 → 0 isobaric analogous transitions in A = 26 isobar triplet, where Tz is the z component of isospin T and is defined by Tz = (N - Z) / 2. The isospin symmetric Tz = -1 → 0 Gamow-Teller (GT) transitions can be determined in the 26Si β decay. Assuming this symmetry it is possible to study the GT transition strengths for high excited states in 26Al induced by the (3He, t) charge-exchange (CE) reaction at intermediate energies (> 100 MeV/nucleon) and at forward scattering angles including 0o, where Tz = +1 → 0 GT transitions from the Jπ = 0+ ground state of 26Mg to the Jπ = 1+ excited states in 26Al were extended to the excitation energy (Ex) of 9 MeV. (author)