Measurement of the 72Ge(n, γ) cross section over a wide neutron energy range at the CERN n_TOF facility
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American Physical Society
Dietz, M., Lederer-Woods, C., Tattersall, A., Battino, U., Gunsing, F., Heinitz, S., ... & n_TOF Collaboration. (2021). Measurement of the 72 Ge (n, γ) cross section over a wide neutron energy range at the CERN n_TOF facility. Physical Review C, 103(4), 045809. [10.1103/PhysRevC.103.045809]
SponsorshipAdolf Messer Foundation; Austrian Science Fund (FWF) J 3503; UK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC) ST/M006085/1; European Research Council (ERC); European Commission 677497; Croatian Science Foundation 8570; Ministry of Education, Youth & Sports - Czech Republic; Charles University UNCE/SCI/013
The 72Ge(n, γ ) cross section was measured for neutron energies up to 300 keV at the neutron time-of-flight facility n_TOF (CERN), Geneva, for the first time covering energies relevant to heavy-element synthesis in stars. The measurement was performed at the high-resolution beamline EAR-1, using an isotopically enriched 72GeO2 sample. The prompt capture γ rays were detected with four liquid scintillation detectors, optimized for low neutron sensitivity. We determined resonance capture kernels up to a neutron energy of 43 keV, and averaged cross sections from 43 to 300 keV. Maxwellian-averaged cross section values were calculated from kT = 5 to 100 keV, with uncertainties between 3.2% and 7.1%. The new results significantly reduce uncertainties of abundances produced in the slow neutron capture process in massive stars.