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Measurement of the 72Ge(n,γ) cross section over a wide neutron energy range at the CERN n_TOF facility

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Publication details

JournalPhysical Review C
DateAccepted/In press - 18 Mar 2021
DatePublished (current) - 27 Apr 2021
Issue number4
Original languageEnglish


The Ge72(n,γ) cross section was measured for neutron energies up to 300keV 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 GeO272 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 43keV, and averaged cross sections from 43 to 300keV. Maxwellian-averaged cross section values were calculated from kT=5 to 100keV, 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.

Bibliographical note

Funding Information:
This work was supported by the Adolf Messer Foundation, the Austrian Science Fund FWF (J 3503), the Science and Technology Facilities Council UK , the European Research Council ERC-2015-STG No. 677497, 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.

Publisher Copyright:
© 2021 authors. Published by the American Physical Society.

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