Abstract
The response of a position-sensitive Li-glass based scintillation detector being developed for thermal-neutron detection with 6 mm position resolution has been investigated using focused beams of 2.5MeV protons and deuterons. The beams were scanned across the detector in 0.5 mm horizontal and vertical steps perpendicular to the beams. Scintillation light was registered using an 8 × 8 pixel multi-anode photomultiplier tube. The signal amplitudes were recorded for each pixel on an event-by-event basis. Several pixels generally registered considerable signals at each beam location. To optimize planned detector operation at the European Spallation Source, the number of pixels above set thresholds was investigated, with the maximization of the single-hit efficiency over the largest possible area as the primary goal. For both beams, at a threshold of ∼50% of the mean of the full-deposition peak, ∼80% of the events were registered in a single pixel, resulting in an effective position resolution of ∼5 mm in X and Y. Lower thresholds resulted in higher pixel multiplicities. These events could also be localized with the same effective position resolution.
Highlights
Position-sensitive 3He-free [1,2,3,4] thermal-neutron detectors with high counting-rate capability are essential to the scientific program to be carried out at the European Spallation Source (ESS) [5,6,7,8]
The simulations underestimate the amount of scintillation light spreading to the adjacent pixel closest to the particle interaction point by up to 15% depending on the beam position
The position-dependent response of a SoNDe module, which consists of a 1 mm thick sheet of GS20 scintillating glass coupled to a 64 pixel H12700A multianode photomultiplier tube (MAPMT) has been measured using highly focused beams of protons and deuterons
Summary
Position-sensitive 3He-free [1,2,3,4] thermal-neutron detectors with high counting-rate capability are essential to the scientific program to be carried out at the European Spallation Source (ESS) [5,6,7,8]. Scans of a collimated beam of ∼ 4 MeVα-particles from a 241Am source have been used to study the position-dependent response of a SoNDe detector prototype [34]. Complement the existing α-particle studies on the positionsensitive response of the detector for events triggering up to four pixels to establish more precisely the response of a SoNDe module at the vertical and horizontal boundaries between pixels and the corners where four pixels meet. 2. provide data with precision of better than 1 mm on the position sensitivity of the detector, primarily for events triggering only one pixel (Sections 2.2.3 and 4) as M = 1 mode of operation has been envisioned as the default for ESS. 3. map the detector as a function of threshold and beam position when counting events which trigger only one pixel. 5. identify regions, if any, where an event position-reconstruction accuracy better than 6 mm may be obtained for M > 1 events
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