2016/02/18 by A. Simon, M. Guttormsen, A. C. Larsen +16
Physics and Astronomy · #Astronomical and nuclear sciences #Atomic physics #Electromagnetic shielding #Gamma ray #Low energy #Nuclear physics #Nuclear physics research studies #Nuclear reaction #Nucleosynthesis #Physics #Quantum mechanics #Rare-earth and actinide compounds #Shields #nucl-ex
paper · pdf · doi:10.1103/physrevc.93.034303
arxiv created 2016/02/18 · openalex publication_date 2016/03/04 · arxiv updated 2016/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The \ensuremathγ-ray strength function and level density in the quasi-continuum of 151,153Sm have been measured using bismuth germanate shielded Ge clover detectors of the STARLiTeR system. The Compton shields allow an extraction of the \ensuremathγ strength down to unprecedentedly low \ensuremathγ energies of \ensuremath≈500 keV. For the first time an enhanced low-energy \ensuremathγ-ray strength has been observed in the rare-earth region. In addition, for the first time both the upbend and the well-known scissors resonance have been observed simultaneously for the same nucleus. Hauser-Feshbach calculations show that this strength enhancement at low \ensuremathγ energies could have an impact of 2--3 orders of magnitude on the (n,\ensuremathγ) reaction rates for r-process nucleosynthesis.