Observation of aT>Gamow-Teller State inCa48(p,n)Sc48at 160 MeV

Neutron spectra from the reaction ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$($p$,$n$) ${}_{}{}^{48}{}_{}{}^{}\mathrm{Sc}$ at 160 MeV reveal a prominent narrow peak at $E_x=16.8\mathrm{}$ MeV. This state is interpreted as a spin-flip isovector giant resonance; it carries a significant fraction of the $T_{>}$ ($T=4\mathrm{}$) Gamow-Teller strength. The observed position of this resonance agrees with both a recent shell-model prediction and with the position expected from systematics for the analog of the giant $M1\mathrm{}$ resonance in ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$.