Abstract
The low-energy $M1$ component that can be observed in quasicontinuum $\ensuremath{\gamma}$-ray spectra from heavy-ion reactions is studied within the core-quasiparticle model. Inclusive one-quasiparticle calculations for sequences of isotopes and isotones indicate how the $M1$ "bumps" vary depending on the structure of the nucleus. Application of the results to higher spins and even-even nuclei is possible on the basis of a spectator quasiparticle hypothesis, which is seen to be adequate qualitatively but not quantitatively.NUCLEAR STRUCTURE Calculated $M1$ quasicontinuum $\ensuremath{\gamma}$-ray spectra, deduced dependences on particle and quasiparticle number. Core-quasiparticle coupling models.
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