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Under the assumption that isospin T is a good quantum number, mirror transitions Tz = +1 → 0 and Tz = −1 → 0 were studied in A = 34 isobars, where Tz is z component of iospin T and is defined by Tz = (N − Z)/2. With a high energy resolution of 35 keV in S(He,t)Cl reaction measurement at 0 scattering angle and at an incident energy of 140 MeV/nucleon, strengths of Fermi and Gamow-Teller (GT) transitions from the J = 0, Tz = +1 ground state of S to the J = 1, Tz = 0 excited states in Cl were determined up to excitation energy (Ex) of 7.08 MeV. The corresponding isospin-symmetric transitions connecting Tz = −1 and Tz = 0 states can be studied in the Ar β decay. The strengths of the (GT)± transitions were compared up to the excitation energy of 3.1 MeV. A good agreement was observed for two strong transitions to 2.580 MeV and 3.129 MeV states, while a disagreement about 45% was observed for a weaker transition to 0.666 MeV low-lying state.

Determination of GT-transition Strengths in \(A=34\) Isobars Using Charge Exchange \((^3\text{He},t)\) Reaction