Neutron activation of Ga-69 and Ga-71 at k(B)T approximate to 25 keV

Kathrin Goebel, Clemens Beinrucker, Benjamin Bruckner, Philipp Erbacher, Stefan Fiebiger, Micaela Fonseca, Michael Heftrich, Tanja Heftrich, Franz Kaeppeler, Antonin Krasa, Deniz Kurtulgil, Claudia Lederer-Woods, Ralf Plag, Arjan Plompen, Rene Reifarth, Stefan Schmidt, Kerstin Sonnabend, Mario Weigand

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 kBT ≈ 25 keV is the first experiment in a series of activation and time-of-flight measurements on 69Ga and 71Ga relevant for astrophysics.
Methods: We activated 69Ga and 71Ga with a neutron distribution that corresponds to a quasistellar distribution with kBT = 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 σGa/σAu for the neutron spectrum of the activation. We obtain values of σ69Ga,SACS = (186 ± 12) mb and σ71Ga,SACS = (112 ±
7) mb, and cross-section ratios of σ69Ga/σAu = 0.29 ± 0.02 and σ71Ga/σAu = 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 69Ga and about 20% lower for 71Ga.
Original languageEnglish
Article number025802
Pages (from-to)1-7
Number of pages7
JournalPhysical Review C
Issue number2
Publication statusPublished - 12 Feb 2021


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