Abstract
The search for neutron-antineutron (nn) oscillations conducted by a Heidelberg-ILL-Padova-Pavia collaboration at the European slow neutron facility at Grenoble requires a very strong cold neutron beam, but an extremely low neutron-induced radiation background. This article describes the analysis and suppression of neutron-beam-related background in the nn experiment. In particular, the fabrication of a 20 m2 shield of isotopically pure sintered 6LiF ceramics which protects the annihilation detector from the inside against neutrons scattered from the annihilation target is described.
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