Determination of Cross-Sections of Fast-Muon-Induced Reactions to Cosmogenic Radionuclides

%NA54 %title\\ \\We propose to measure cross-sections for fast muon-induced production of radionuclides. Firstly to study the contribution of fast-muon-induced reactions to the in-situ production of cosmogenic radionuclides in the lithosphere. Concrete is used to simulate the rock and to generate a secondary particle shower. The reaction channels to be measured are: C to $^{10}$Be, O to $^{10}$Be and $^{14}$C, Si to $^{26}$Al, S to $^{26}$Al, Ca to $^{36}$Cl, Fe to $^{53}$Mn and $^{205}$Tl to $^{205}$Pb. The energy dependent cross-section can be described by one single parameter $\sigma_0$ and the energy dependence $\rm\overline{E}^{0.7}$ on the mean energy $\rm\overline{E}$. The irradiations of the targets is done at CERN. The produced radionuclides are measured by accelerator mass spectrometry in Munich and Zurich.\\ \\Secondly, muon induced signals can be a major source of background in experiments with low event rates located deep underground. We intent to study the produced radioactivity by fast-muon-induced reactions in a liquid scintillation detector. Our main interest is the measurement of the cross sections for $^{12}$C to $^{11}$C and $^{7}$Be. In addition we will study the produced radioactivity in targets of Saphire(Al$_2$O$_3$) and Cu for a cryogenic dark matter detector. \\ \\