80Se(n,γ) cross-section measurement at CERN n TOF

nToF, A.S. Brown

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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 ß-decay rate. However, an astrophysically consistent interpretation requires also the knowledge of the closest neighbour isotopes involved. In particular, the 80Se(n,?) 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.

Original languageEnglish
Article number012001
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 21 Oct 2020
Event9th Nuclear Physics in Astrophysics, NPA 2019 - Frankfurt, Germany
Duration: 15 Sept 201920 Sept 2019

Bibliographical note

Funding Information:
We acknowledge support from from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 681740), and the Spanish project FPA2017-83946-C2-1-P.

© Published under licence by IOP Publishing Ltd.

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