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The relevant interaction energies for astrophysical radiative capturereactions are very low, much below the repulsive Coulomb barrier. This leads tolow cross sections, low counting rates in $\gamma$-ray detectors, and thereforethe need to perform such experiments at ion accelerators placed in undergroundsettings, shielded from cosmic rays. Here, the feasibility of such experimentsin the new shallow-underground accelerator laboratory in tunnels VIII and IX ofthe Felsenkeller site in Dresden, Germany, is evaluated. To this end, theno-beam background in three different types of germanium detectors, i.e. aEuroball/Miniball triple cluster and two large monolithic detectors, ismeasured over periods of 26-66 days. The cosmic-ray induced background is foundto be reduced by a factor of 500-2400, by the combined effects of, first, the140 meters water equivalent overburden attenuating the cosmic muon flux by afactor of 40, and second, scintillation veto detectors gating out most of theremaining muon-induced effects. The new background data are compared to spectrataken with the same detectors at the Earth's surface and at other undergroundsites. Subsequently, the beam intensity from the cesium sputter ion sourceinstalled in Felsenkeller has been studied over periods of several hours. Basedon the background and beam intensity data reported here, for the example of the$^{12}$C($\alpha$,$\gamma$)$^{16}$O reaction it is shown that highly sensitiveexperiments will be possible.

Background in $\gamma$-ray detectors and carbon beam tests in the Felsenkeller shallow-underground accelerator laboratory