Investigations in high temperature irradiated 6,7LiH and 6LiD, its dynamic nuclear polarization and radiation resistance

Samples of 7LiH, 6LiD, 6LiH have been irradiated at the Bonn 20 MeV electron preaccelerator under various temperatures and with different radiation doses. The most important paramagnetic defect, the so-called F-center, created during these irradiations has been studied in a conventional EPR spectrometer at liquid nitrogen temperature. Also several samples have been dynamically polarized in both a 4He evaporation cryostat (1 K) and in a 3He4He dilution refrigerator (200 mK) at a magnetic field of 2.5 and 5 T. Finally some selected samples have been exposed to an intense (up to 70 nA) and high energy (1.2 GeV) electron beam at the Bonn Electron Stretcher and Accelerator ELSA.