The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF Dietz, M. Porras Sánchez, José Ignacio Praena Rodríguez, Antonio Javier In line with the principles that apply to scientific publishing and the CERN policy in matters of scientific publications, the n_TOF Collaboration recognises the work of V. Furman and P. Sedyshev (JINR, Russia), who have contributed to the experiment used to obtain the results described in this paper. This work was supported by the European Research Council ERC-2015-STG Nr. 677497, the Austrian Science Fund FWF (J 3503), the Science and Technology Facilities Council UK (ST/M006085/1), the Adolf Messer Foundation, the Croatian Science Foundation under the project 8570, the MSMT of the Czech Republic, the Charles University UNCE/SCI/013 project and by the funding agencies of the participating institutes. The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The Ge-72(n, gamma) Maxwellian-Averaged Cross Section (MACS) has an important influence on the production of isotopes between Ge and Zr in the weak s-process in massive stars and so far only theoretical estimations are available. An experiment was carried out at the neutron time-of-flight facility n_TOF at CERN to measure the Ge-72(n, gamma) reaction for the first time at stellar neutron energies. The capture measurement was performed using an enriched (GeO2)-Ge-72 sample at a flight path length of 184 m, which provided high neutron energy resolution. The prompt gamma rays produced after neutron capture were detected with a set of liquid scintillation detectors (C6D6). The neutron capture yield is derived from the counting spectra taking into account the neutron flux and the gamma-ray detection efficiency using the Pulse Height Weighting Technique. Over 70 new neutron resonances were identified, providing an improved resolved reaction cross section to calculate experimental MACS values for the first time. The experiment, data analysis and the new MACS results will be presented including their impact on stellar nucleosynthesis, which was investigated using the post-processing nucleosynthesis code mppnp for a 25 solar mass model. 2023-10-18T12:21:40Z 2023-10-18T12:21:40Z 2023-05-26 conference output Dietz, M. et al. The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF. EPJ Web of Conferences 284, 01017 (2023) ND2022. [https://doi.org/10.1051/epjconf/202328401017] https://hdl.handle.net/10481/85083 10.1051/epjconf/202328401017 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional EDP Sciences