The search for neutron-antineutron (nnBAR) 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 nnBAR experiment. In particular, the fabrication of a 20 m2 shield of isotopically pure sintered (LiF)-Li-6 ceramics which protects the annihilation detector from the inside against neutrons scattered from the annihilation target is described.
THE SUPPRESSION OF BEAM RELATED BACKGROUND IN THE ILL NEUTRON ANTI-NEUTRON OSCILLATION EXPERIMENT
GIBIN, DANIELE;LAVEDER, MARCO;
1992
Abstract
The search for neutron-antineutron (nnBAR) 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 nnBAR experiment. In particular, the fabrication of a 20 m2 shield of isotopically pure sintered (LiF)-Li-6 ceramics which protects the annihilation detector from the inside against neutrons scattered from the annihilation target is described.
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