Gamow-Teller strength in $\mathrm{}(n,p)\mathrm{}$ charge exchange on ${}^{31}\mathrm{P}$

Using the charge exchange facility and second arm spectrometer at TRIUMF, we have measured the ${}^{31}\mathrm{P}\mathrm{}(n,p)\mathrm{}$ double differential cross section for 198 MeV incident neutrons, at scattering angles of $0–30°,$ and excitation energies up to 30 MeV. Via a multipole decomposition analysis we have extracted both the Gamow-Teller strength distribution and the GT transition probabilities to low-lying ${}^{31}\mathrm{Si}$ bound states. Comparison to a shell model calculation, using the full $1s-0d$ space and universal SD interaction, shows reasonable agreement in the strength distribution, but reduced summed strength in the experiment $(\sum B_{\mathrm{GT}}=2.32\mathrm{}\pm 0.20$ for $E_x<~10\hspace{0.5em}\mathrm{MeV})$ relative to the theory $(\sum B_{\mathrm{GT}}=3.33\mathrm{}$ for $E_x<~10\hspace{0.5em}\mathrm{MeV}).\mathrm{}$ We discuss the role of configuration mixing and Pauli blocking on the ${}^{31}{P}^{31}\mathrm{Si}$ GT strength distribution.