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We have measured cross sections for (d,²He)-induced reactions on ²⁶Mg at an energy of E_d=125.2 MeV. The measured Gamow-Teller strength is significantly smaller than that inferred from (p,n) reactions. We demonstrate that β⁺ Gamow-Teller strengths for T₀+1 states deduced from (p,n) reactions may have significant systematic uncertainties due to ambiguities in the large backgrounds that must be subtracted. © 1996 The American Physical Society.

We have measured cross sections for (d,²He) induced reactions on the p-shell nuclei ⁶Li, ¹²C, and ¹³C and the sd-shell nucleus ²⁴Mg at an energy of E_d=125.2 MeV. The measured excitation energy spectra are very similar to those from (p,n), (n,p), and (d,²He) reactions at higher energies. The measured 0° (d,²He) cross sections show a remarkably well-defined linear relation with the Gamow-Teller strengths deduced either from β decay or from (p,n) reactions. Our results demonstrate that the (d,²He) reaction can be used as a powerful tool to study Gamow-Teller strengths in the β⁺ direction at energies as low as E_d=125.2 MeV.