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The CLAS12 Backward Angle Neutron Detector (BAND)

Author(s)
Segarra, Efrain Patrick; Hauenstein, F.; Schmidt, A.; Price, K.; Vega, I.; Barlow, J.; Barriga, E.; Beck, Arie; Brooks, W.; Cohen, E.; Cruz Torres, Reynier; Denniston, Alastair K.; Duer, M.; Eugenio, P.; Fogler, C.; Hakobyan, H.; Hartlove, T.; Hrnjic, A.; Korover, I.; Kutz, Tyler; May-Tal Beck, S; Nambrath, A.; Ostrovidov, A.; Piasetzky, E.; Pybus, J. R.; Ungerer, M.; Weinstein, L.B.; Hen, Or; ... Show more Show less
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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.
Date issued
2020-07
URI
https://hdl.handle.net/1721.1/130306
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
0168-9002

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