2008/06/12 by I. Dillmann, M. Heil, Dillmann, I. +18
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Nuclear physics research studies #Scientific Research and Discoveries #astro-ph #nucl-ex
paper · pdf · doi:10.48550/arxiv.0806.2063
Proceedings "Nuclei in the Cosmos" NIC- IX, June 25-30 2006, CERN, Geneva/ Switzerland, published with Proccedings of Science, PoS(NIC-IX)089
arxiv created 2008/06/12 · openalex publication_date 2008/06/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Although 79Se represents an important branching in the weak s process, the stellar neutron capture cross sections to this isotope have not yet been measured experimentally. In this case, experimental data is essential for evaluating the important branching in the s-process reaction path at 79Se. The total cross section of 78Se at a stellar energy of kT = 25 keV has been investigated with a combination of the activation technique and accelerator mass spectrometry (AMS), since offline decay counting is prohibitive due to the long terrestrial half life of 79Se (2.80±0.36 ×105 y) as well as the absence of suitable γ-ray transitions. The preliminary result for the total Maxwellian averaged cross section is <σ>30 keV= 60.1±9.6 mbarn, significantly lower than the previous recommended value. In a second measurement, also the partial cross section to the 3.92 min-isomer was determined via γ-spectroscopy and yielded <σ>30 keV(part.)= 42.0±2.0 mbarn.