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Neutron activation of 69 Ga and 71 Ga at k B T ≈ 25 keV

Background: About 50% of heavy elements are produced by the slow neutron capture process ( s process) in stars. The element gallium is mostly produced during the weak s process in massive stars. Purpose: Our activation at k B T ≈ 25 keV is the ﬁrst experiment in a series of activation and time-of-ﬂight measurements on 69 Ga and 71 Ga relevant for astrophysics. Methods: We activated 69 Ga and 71 Ga with a neutron distribution that corresponds to a quasistellar distribution with k B T = 25 keV at the Joint Research Centre (JRC), Geel, Belgium. Protons were provided by an electrostatic Van de Graaff accelerator to produce neutrons via the reaction 7 Li(p , n). The produced activity was measured via the γ emission by the decaying product nuclei by high-purity germanium detectors. Results: We provide spectrum-averaged cross sections (SACS) and ratios of the cross sections σ Ga /σ Au for the neutron spectrum of the activation. We obtain values of σ 69Ga , SACS = (186 ± 12) mb and σ 71Ga , SACS = (112 ± 7) mb, and cross-section ratios of σ 69Ga /σ Au = 0 . 29 ± 0 . 02 and σ 71Ga /σ Au = 0 . 17 ± 0 . 01. Conclusions: Our data disagree with the available evaluated data provided by KADoNiS v0.3, our cross-section ratio is about 20% higher for 69 Ga and about 20% lower for 71 Ga. 10.1103/PhysRevC.103.025802