Neutron activation of Ga69 and Ga71 at kBT?25keV

Background: About 50% of heavy elements are produced by the slow neutron capture process ($s$ process) in stars. The element gallium is mostly during weak $s$ massive stars.Purpose: Our activation at ${k}_{\mathrm{B}}T\phantom{\rule{4pt}{0ex}}\ensuremath{\approx}25$ keV first experiment a series and time-of-flight measurements on $^{69}\mathrm{Ga}$ $^{71}\mathrm{Ga}$ relevant for astrophysics.Methods: We activated with distribution that corresponds to quasistellar ${k}_{\mathrm{B}}T=25\phantom{\rule{4pt}{0ex}}\mathrm{keV}$ Joint Research Centre (JRC), Geel, Belgium. Protons were provided an electrostatic Van de Graaff accelerator produce neutrons via reaction $^{7}\mathrm{Li}(\mathrm{p},\mathrm{n})$. activity was measured $\ensuremath{\gamma}$ emission decaying product nuclei high-purity germanium detectors.Results: provide spectrum-averaged cross sections (SACS) ratios ${\ensuremath{\sigma}}_{\text{Ga}}/{\ensuremath{\sigma}}_{\text{Au}}$ spectrum activation. obtain values ${\ensuremath{\sigma}}_{69\mathrm{Ga},\mathrm{SACS}}=(186\phantom{\rule{0.16em}{0ex}}\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0.16em}{0ex}}12)\phantom{\rule{4pt}{0ex}}\mathrm{mb}$ ${\ensuremath{\sigma}}_{71\mathrm{Ga},\mathrm{SACS}}=(112\phantom{\rule{0.16em}{0ex}}\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0.16em}{0ex}}7)\phantom{\rule{4pt}{0ex}}\mathrm{mb}$, cross-section ${\ensuremath{\sigma}}_{\text{69Ga}}/{\ensuremath{\sigma}}_{\text{Au}}=0.29\phantom{\rule{4pt}{0ex}}\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0.16em}{0ex}}0.02$ ${\ensuremath{\sigma}}_{\text{71Ga}}/{\ensuremath{\sigma}}_{\text{Au}}=0.17\phantom{\rule{4pt}{0ex}}\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0.16em}{0ex}}0.01$.Conclusions: data disagree available evaluated KADoNiS v0.3, our ratio about 20% higher lower $^{71}\mathrm{Ga}$.