Abstract
We have studied spin-isospin excitations in Co-58 via the (n,p) type Ni-58(d,He-2)Co-58 reaction at small angles and an incident deuteron energy of 170 MeV. An energy resolution of 130 keV, full width at half maximum, was obtained allowing the extraction of Gamow-Teller strength to 13 individual levels in Co-58 below an excitation energy of 4.1 MeV. These DeltaL=0 transitions were identified by comparing the measured angular distributions with distorted-wave Born approximation (DWBA) calculations. A multipole decomposition analysis based on those DWBA calculations allowed the determination of the fractions of the DeltaL=0, 1, 2 components in the excitation spectrum. The experimental results are in reasonable agreement with large-scale shell-model calculations.
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