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Gamow-Teller and dipole transitions to final states in 13B were studied viathe 13C(t,3He) reaction at Et = 115 AMeV. Besides the strong Gamow-Tellertransition to the 13B ground state, a weaker Gamow-Teller transition to a stateat 3.6 MeV was found. This state was assigned a spin-parity of 3/2- bycomparison with shell-model calculations using the WBP and WBT interactionswhich were modified to allow for mixing between nhw and (n+2)hw configurations.This assignment agrees with a recent result from a lifetime measurement ofexcited states in 13B. The shell-model calculations also explained therelatively large spectroscopic strength measured for a low-lying 1/2+ state at4.83 MeV in 13B. The cross sections for dipole transitions up to Ex(13B)= 20MeV excited via the 13C(t,3He) reaction were also compared with the shell-modelcalculations. The theoretical cross sections exceeded the data by a factor ofabout 1.8, which might indicate that the dipole excitations are "quenched".Uncertainties in the reaction calculations complicate that interpretation.

Spectroscopy of 13B via the 13C(t,3He) reaction at 115 AMeV