Gamma-ray line features from the Crab Nebula in the energy range 50–2000 keV

Results are presented of an experiment to search for γ-ray lines from the Crab Nebula region in the energy range 50–2000 keV using a cooled intrinsic germanium detector in a sodium iodide anti-coincidence shield. Some evidence for line features is observed at 404.4 and 1049.6 keV with intensities at the top of the atmosphere of (7.2 ± 2.1) × 10−3 and (1.9 ± 0.4) × 10−2 photons cm−2 s−1 respectively. A line at 78.9 keV has also been detected which shows some variability with time.