Resonant photon scattering from ${}_{}{}^{39}{}_{}{}^{}\mathrm{K}$ has been studied with bremsstrahlung produced by electrons with end-point energies of 6.6, 8.5, and 9.4 MeV. Values of g${\Gamma }_0^2$/Γ for 24 levels below 9 MeV were measured and the g${\Gamma }_0$ values of 17 levels were deduced. The widths of some levels above 4 MeV were found to be much larger (on the average, more than a factor of 10) than those reported from experiments using the Doppler shift attenuation method. Three of these levels are known from studies of the (d${,}^3$He) reaction to carry most of the $d_{5/2}^{\mathrm{-}1}$ proton strength in ${}_{}{}^{39}{}_{}{}^{}\mathrm{K}$. The B(M1↑) strength of J${=(5/2\mathrm{}}^{+}$ levels below 7 MeV is compared with predictions based on simple single-particle shell-model wave functions coupled with free-nucleon and empirically renormalized M1 operators and weighted by single-proton pickup spectroscopic factors.

• Received 29 January 1988

DOI:https://doi.org/10.1103/PhysRevC.37.2428