First tests of the applicability of gamma-ray imaging for background discrimination in time-of-flight neutron capture measurements

作者：Perez Magan D L; Caballero L; Domingo Pardo C^*; Agramunt Ros J; Albiol F; Casanovas A; Gonzalez A; Guerrero C; Lerendegui Marco J; Tarifeno Saldivia A

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2016, 823: 107-119.

DOI：10.1016/j.nima.2016.03.073

• Neutron capture cross-sections
• gamma-ray imaging
• Total energy detectors
• Pulse-height weighting technique
• Time-of-flight method

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.

• 出版日期2016-7-1