We report measurements of the ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$(n,p) differential cross section at an incident energy of 198 MeV and angles from 0° to 24° using the TRIUMF Charge Exchange Facility. From these data we determine Gamow-Teller (GT) transition probabilities to low lying 1/$2^{+}$, 3/$2^{+}$, and 5/$2^{+}$ ${}_{}{}^{23}{}_{}{}^{}\mathrm{Ne}$ states and the ${\mathrm{GT}}^{+}$ strength distribution up to 25 MeV excitation energy. The values of ${\mathrm{B}}_{\mathrm{GT}}^{+}$ to discrete states, and the ${\mathrm{GT}}^{+}$ strength below 10 MeV, are found to be in reasonable agreement with a full 1s-0d shell model calculation with a normalization factor of about 0.74. The ${\mathrm{GT}}^{+}$ strength above 10 MeV suggests the removal of strength from lower to higher excitation energies. We also compare the ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$(n,p) data with ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$(${\mathrm{\mu }}^{\mathrm{-}}$,ν) data and find agreement between the values of ${\mathrm{B}}_{\mathrm{GT}}^{+}$ to discrete levels extracted from the (n,p) and (${\mathrm{\mu }}^{\mathrm{-}}$,ν) reactions. The general consistency of the (n,p) and (${\mathrm{\mu }}^{\mathrm{-}}$,ν) data, and the full 1s-0d shell model calculation, give confidence in a recent extraction of the weak pseudoscalar coupling from ${\mathrm{\mu }}^{\mathrm{-}}$ capture on ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$. Finally, using both ${\mathrm{\beta }}^{\mathrm{-}}$-decay and ${\mathrm{\mu }}^{\mathrm{-}}$ capture data, we obtain unit cross sections from the ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$(n,p) measurement.

• Received 6 April 1995

DOI:https://doi.org/10.1103/PhysRevC.52.1488