Gamow-Teller strengths in 24Na using the 24Mg(t,3He) reaction at 115A MeV

Gamow-Teller transitions from Mg-24 to Na-24 were studied via the (t,He-3) reaction at 115A MeV using a secondary triton beam produced via fast fragmentation of 150A MeV O-16 ions. Compared to previous (t,He-3) experiments at this energy that employed a primary alpha beam, the secondary beam intensity is improved by about a factor of five. Despite the large emittance of the secondary beam, an excitation-energy resolution of similar to 200 keV is achieved. A good correspondence is found between the extracted Gamow-Teller strength distribution and those available from other charge-exchange probes. Theoretical calculations using the newly developed USDA and USDB sd-shell model interactions reproduce the data well.