Underground nuclear astrophysics: Status and recent results from Felsenkeller laboratory

Abstract

For almost three decades it has been known that the study of astro-physically important nuclear reactions between stable nuclei requires the use of low-background, underground accelerator laboratories. The Felsenkeller shallow-underground laboratory in Dresden, shielded by a 45 m thick rock cover, hosts a 5 MV Pelletron ion accelerator with an external sputter ion source (mainly able to provide carbon and oxygen beams) and an internal radio-frequency ion source (providing proton and alpha beams). The reduced muon, neutron and gamma-ray background achieved both with natural and active shielding situate the laboratory well in line with deep underground accelerator labs worldwide and allows highly sensitive nuclear reaction experiments. Currently, measurements affecting the solar fusion and Big Bang nucleosynthesis are ongoing. In addition to in-house research by HZDR and TU Dresden, the lab is an open facility for scientific users worldwide, with beam time applications reviewed by an independent science advisory board. Furthermore, EU-supported transnational access is available via the ChETEC- INFRA network for nuclear astrophysics. A brief introduction to underground nuclear astrophysics, status of the Felsenkeller shallow-underground laboratory and some preliminary results are discussed.

References in corpus (15)

• The primordial deuterium abundance of the most metal-poor damped Lyman-alpha system
• Implication of the proton-deuteron radiative capture for Big Bang Nucleosynthesis
• LUNA: Status and Prospects
• Three new low-energy resonances in the ${}^{22}$Ne(p,$\gamma$)${}^{23}$Na reaction
• Activation measurement of the 3He(a,g)7Be reaction cross section at high energies
• Direct measurement of the 13C(α,n)16O cross section into the s-process Gamow peak
• New proton-capture rates on carbon isotopes and their impact on the astrophysical ${}^{12}\mathrm{C}/{}^{13}\mathrm{C}$ ratio
• First direct limit on the 334 keV resonance strength in the ${}^{22}$Ne(α,γ)${}^{26}$Mg reaction
• Background in $\gamma$-ray detectors and carbon beam tests in the Felsenkeller shallow-underground accelerator laboratory
• The muon intensity in the Felsenkeller shallow underground laboratory
• Improved $S$-factor of the ${}^{12}$C(p,$\gamma$)${}^{13}$N reaction at $E=$320-620~keV and the 422~keV resonance
• Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated ${}^3$He counters
• A new ultra low-level HPGe activity counting setup in the Felsenkeller shallow-underground laboratory
• Measurement of the ${}^2$H($p,\gamma$)${}^3$He S-factor at 265-1094keV
• Development of a jet gas target system for the Felsenkeller underground accelerator

Cited by in corpus (1)

• Nuclear astrophysics