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Primary energy spectra of cosmic rays selected by mass groups in the knee region

The KASCADE experiment measures the electron and muon number of extensive air showers in the knee region with high precision. From these data shower size spectra for electrons and muons are constructed. An analysis is pre- sented in which electron and muon size spectra in three dif- ferent zenith angle bins are analysed simultaneously. With a four component assumption for the mass composition of pri- mary cosmic rays (hydrogen, helium, carbon and iron) and using unfolding methods taking into account shower fluctu- ations and experimental effects energy spectra of these mass groups in the range between 10 15 and 10 17 eV are recon- structed. Each energy spectrum shows a steepening of the index of the resulting power law with a knee-like structure. The positions of the individual knees suggest a rigidity de- pendence. array contains four liquid scintillation counters to measure the electromagnetic part of the shower. The outer stations contain only two of these detectors but additionally below an iron-lead absorber plastic scintillators to measure muons. Using the information of these detectors it is possible to re- construct the location of the shower core, the direction of the shower and using the NKG formula the total number of electrons Ne and the so called truncated muon numberN tr: . The latter one is the number of muons inside a ring around the shower core with an inner radius of 40 m and outer ra- dius of 200 m. Simulations have shown that this quantity is more robust against systematical reconstruction errors than the total muon number. During the reconstruction the contri- butions of accompanying particles in each detector are taken into account. A detailed description of the setup and the re-