Abstract
A statistical model analysis of heavy-ion, xn\ensuremath{\gamma} data puts constraints on the electromagnetic dipole strength functions at low energies, ${E}_{\ensuremath{\gamma}}$\ensuremath{\sim}0.5--4 MeV. The M1 strength is inferred to be up to an order of magnitude smaller than at the higher energies of neutron capture gamma rays. The analysis supports the Kadmensky-Markushev-Furman shape of the E1 strength function, with a low-energy tail of the giant resonance that is suppressed relative to the shape based on a Lorentzian. The data considered include the yrast feeding pattern in the N=92 isotones $^{160}\mathrm{Er}$, $^{162}\mathrm{Yb}$, and $^{164}\mathrm{Hf}$, and in $^{152}\mathrm{Dy}$ up to spin 60\ensuremath{\Elzxh}.
Published Version
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