Accelerator mass spectrometry with completely stripped 41Ca and 53Mn ions at the Munich tandem accelerator

Abstract Accelerator mass sepctrometry (AMS) experiments with completely stripped 41 Ca and 53 Mn ions have been performed at the Munich tandem laboratory. It is the first time that 53 Mn has been detected by AMS. The necessary high beam energies of 5.5 MeV/nucleon were provided by the recently installed second linear postaccelerator cavity. Negative ion beams of CaF − and MnO − in the μA range were provided by an improved Middleton high current source. Sensitivities of 41 Ca Ca = 9 × 10 −13 and of 53 Mn Mn = 3 × 10 −11 were achieved. 41 Ca was measured in samples from a meteorite and from Hiroshima granite exposed to the A-bomb, 53 Mn in samples from a meteorite and a CERN-SC beam dump.