Differential cross sections for transitions of known weak
strength were measured with the (3He,t) reaction at 420 MeV
on targets of 12C, 13C, 18O, 26Mg, 58Ni, 60Ni, 90Zr, 118Sn,
120Sn and 208Pb. Using these data, it is shown the proportionalities
between strengths and cross sections for this probe follow simple
trends as a function of mass number.
These trends can be used to confidently determine Gamow-Teller strength
distributions in nuclei for which the proportionality cannot be calibrated via
beta-decay strengths. Although theoretical calculations in distorted-wave
Born approximation overestimate the data, they allow one to
understand the main experimental features and to predict deviations
from the simple trends observed in some of the transitions. |
