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The {\gamma}-ray strength function and level density in the quasi-continuumof 151,153Sm have been measured using BGO shielded Ge clover detectors of theSTARLiTeR system. The Compton shields allow for an extraction of the {\gamma}strength down to unprecedentedly low {\gamma} energies of about 500 keV. Forthe first time an enhanced low- energy {\gamma}-ray strength has been observedin the rare-earth region. In addition, for the first time both the upbend andthe well known scissors resonance have been observed simultaneously for thesame nucleus. Hauser-Feshbach calculations show that this strength enhancementat low {\gamma} energies could have an impact of 2-3 orders of magnitude on the(n,{\gamma}) reaction rates for the r-process nucleosynthesis.

First observation of low-energy {\gamma}-ray enhancement in the rare-earth region