[Zurück]

V. Babiano-Suarez, M. Bacak, E. Jericha, -. n_TOF Collaboration et al.:
"⁸⁰Se(n,γ) cross-section measurement at CERN n_TOF";
Journal of Physics: Conference Series, 1668 (2020), 012001; S. 1 - 8.

Radiative neutron capture cross section measurements are of fundamental importance for the study of the slow neutron capture (s-) process of nucleosynthesis. This mechanism is responsible for the formation of most elements heavier than iron in the Universe. Particularly relevant are branching nuclei along the s-process path, which are sensitive to the physical conditions of the stellar environment. One such example is the branching at ⁷⁹Se (3.27 × 10⁵ y), which shows a thermally dependent β-decay rate. However, an astrophysically consistent interpretation requires also the knowledge of the closest neighbour isotopes involved. In particular, the ⁸⁰Se(n,γ) cross section directly affects the stellar yield of the "cold" branch leading to the formation of the s-only ⁸²Kr. Experimentally, there exists only one previous measurement on ⁸⁰Se using the time of flight (TOF) technique. However, the latter suffers from some limitations that are described in this presentation. These drawbacks have been significantly improved in a recent measurement at CERN n_TOF. This contribution presents a summary of the latter measurement and the status of the data analysis.

http://dx.doi.org/10.1088/1742-6596/1668/1/012001