Gamma-ray tracking with the MARS detector

The feasibility of the entire process of $\gamma$ -ray tracking is demonstrated experimentally for the first time. The accuracy of the results is tested by the capability for Doppler correction of $\gamma$ -rays emitted in flight. The resolution of the 847.8 keV ( $2^ + \to 0^ + $ ) transition detected with the MARS detector after Coulomb excitation of a 56Fe beam could be improved from 15 keV to below 5 keV (FWHM).