First tests of the applicability of gamma-ray imaging for background discrimination in time-of-flight neutron capture measurements
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In this work we explore for the first time the applicability of using gamma-ray imaging in neutron capture measurements to identify and suppress spatially localized background. For this aim, a pinhole gamma camera is assembled, tested and characterized in terms of energy and spatial performance. It consists of a monolithic CeBr3 scintillating crystal coupled to a position-sensitive photomultiplier and readout through an integrated circuit AMIC2GR. The pinhole collimator is a massive carven block of lead. A series of dedicated measurements with calibrated sources and with a neutron beam incident on a Au-197 sample have been carried out at n_TOF, achieving an enhancement of a factor of two in the signal-to-background ratio when selecting only those events coming from the direction of the sample. (C) 2016 Elsevier B.V. All rights reserved.
CitationPerez, D., Caballero Ontanaya, L., Domingo-Pardo, C., Agramunt, J., Albiol, F., Casanovas, A., Gonzalez, A., Guerrero, C., Lerendegui, J., Tarifeño, A. First tests of the applicability of gamma-ray imaging for background discrimination in time-of-flight neutron capture measurements. "Nuclear instruments and methods in physics research. Section A, accelerators SP", 1 Juliol 2016, vol. 823, p. 107-119.