The micronucleus assay in human peripheral blood lymphocytes is a sensitive indicator of radiation damage and could serve as a biological dosimeter in evaluating suspected overexposure to ionising radiation. Micronucleus (MN) frequency as a measure of chromosomal damage has also extensively been employed to quantify the effects of radiation dose rate on biological systems. Here we studied the e...

During the last three years at the 1.5 GeV Harmonic Double Sided Microtron (HDSM, [1]) of MAMI a lot of improvements concerning the longitudinal operation of the accelerator were tested and installed. To monitor the rf-power dissipated in the accelerating sections, their cooling water flow and its temperature rise are now continuously logged. Phase calibration measurements of the linacs and the...

The reaction γ p → π0π0 p has been measured using the TAPS BaF2 calorimeter at the tagged photon facility of the Mainz Microtron accelerator in the beam energy range from threshold up to 820 MeV. Close to threshold, chiral perturbation theory (ChPT) predicts that this channel is significantly enhanced compared to double pion final states with charged pions. The strength is attributed dominantly...

Abstract. Compton backscattered x-ray source is developed in the energy region of a few hundred keV at Kansai Photon Science Institute of Japan Atomic Energy Agency (KPSI-JAEA). A remarkable feature of the Compton backscattered x-ray source is that the generated x-ray beam is a well-collimated and has a definite polarization property. The Compton backscattered x-ray source at KPSI-JAEA consists...

Experimental tests of predictions of Chiral Perturbation Theory are traditionally a major topic of the experimental program at the Mainz Microtron (MAMI). In this summary, recent results and an update on the current program on η decays, polarizabilities of the nucleon, and threshold pion production is presented.

We have measured the He(e, ep)H reaction at missing momenta of 130-300 MeV/c using the three-spectrometer facility at the Mainz microtron MAMI. Data were taken in perpendicular kinematics to allow us to determine the response function RLT and the asymmetry term ATL. The data are compared to both relativistic and non-relativistic calculations.