Magnetic Dipole Gamma-Ray Strength Function in Deformed Nuclei, and Neutron-Capture Gamma Rays

The magnetic dipole gamma-ray strength function for some strongly deformed heavy nuclei is computed on the basis of the Nilsson model, pairing, and a residual spin-spin interaction. The strength of the spin-spin interaction is adjusted to give average agreement with experiment of effective spin $g$ factors for low-energy $M1\mathrm{}$ transitions and moments. Predictions are made for average $M1\mathrm{}$ widths of primary transitions following neutron capture; the predictions are in reasonable agreement with recent data.