The CLAS12 Backward Angle Neutron Detector (BAND)
Name
2004.10339.pdf
Description
Accepted version
Size
9.46 MB
Format
Adobe PDF
Checksum (MD5)
817824601b8c4206d5308cd3fee5277f
Author(s)
Segarra, Efrain Patrick
Hauenstein, F.
Schmidt, A.
Price, K.
Vega, I.
Barlow, J.
Barriga, E.
Beck, Arie
Brooks, W.
Cohen, E.
Date Issued
July 2020
Journal
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publisher
Elsevier BV
Citation
Segarra, E.P. et al. "The CLAS12 Backward Angle Neutron Detector (BAND)." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 978 (October 2020): 164356 © 2020 Elsevier B.V.
Version
Author's final manuscript
Abstract
The Backward Angle Neutron Detector (BAND) of CLAS12 detects neutrons emitted at backward angles of 155∘ to 175∘, with momenta between 200 and 600 MeV/c0. It is positioned 3-m upstream of the target, consists of 18 rows and 5 layers of 7.2-cm by 7.2-cm scintillator bars, and read out on both ends by PMTs to measure time and energy deposition in the scintillator layers. Between the target and BAND there is a 2-cm thick lead wall followed by a 2-cm veto layer to suppress gammas and reject charged particles. This paper discusses the component-selection tests and the detector assembly. Timing calibrations (including offsets and time-walk) were performed using a novel pulsed-laser calibration system, resulting in time resolutions better than 250 ps (150 ps) for energy depositions above 2 MeV (5 MeV). Cosmic rays and a variety of radioactive sources were used to calibration the energy response of the detector. Scintillator bar attenuation lengths were measured. The time resolution results in a neutron momentum reconstruction resolution, δp∕p<1.5% for neutron momentum 200≤p≤600 MeV/c. Final performance of the BAND with CLAS12 is shown, including electron–neutral particle timing spectra and a discussion of the off-time neutral contamination as a function of energy deposition threshold.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/j.nima.2020.164356
