Ground state M1 strengths of d5/2-1 levels in K39

Resonant photon scattering from K39 has been studied with bremsstrahlung produced by electrons with end-point energies of 6.6, 8.5, and 9.4 MeV. Values of g02/ for 24 levels below 9 MeV were measured and the g0 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,3He) reaction to carry most of the d5/2-1 proton strength in K39. The B(M1) strength of J=(5/2+ 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.