The CLAS12 Backward Angle Neutron Detector (BAND)
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$$/c_0$$. 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. We report 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.
- Authors:
-
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- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Old Dominion Univ., Norfolk, VA (United States)
- Univ. Técnica Federico Santa María, Valparaíso (Chile)
- Florida State Univ., Tallahassee, FL (United States)
- Tel Aviv Univ., Ramat Aviv (Israel)
- Nuclear Research Center Negev (Israel)
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); Israel Science Foundation (ISF); Pazy Foundation; Clore Foundation; National Fund for Scientific and Technological Development (FONDECYT)
- OSTI Identifier:
- 1642551
- Alternate Identifier(s):
- OSTI ID: 1776928
- Report Number(s):
- JLAB-PHY-20-3206; arXiv:2004.10339; DOE/OR/23177-5007
Journal ID: ISSN 0168-9002; TRN: US2201931
- Grant/Contract Number:
- FG02-94ER40818; SC0020240; FG02-96ER-40960; FG02-93ER40771; AC05-06OR23177; 136/12; 1334/16; 1201964
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
- Additional Journal Information:
- Journal Volume: 978; Journal ID: ISSN 0168-9002
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CLAS12; Time of flight; Plastic scintillator; Ultrafast neutrons
Citation Formats
Segarra, E. P., Hauenstein, F., Schmidt, A., Price, K., Vega, I., Barlow, J., Barriga, E., Beck, A., Brooks, W., Cohen, E., Cruz-Torres, R., Denniston, A., Duer, M., Eugenio, P., Fogler, C., Hakobyan, H., Hartlove, T., Hrnjic, A., Korover, I., Kutz, T., May-Tal Beck, S., Nambrath, A., Ostrovidov, A., Piasetzky, E., Pybus, J. R., Ungerer, M., Weinstein, L. B., and Hen, O. The CLAS12 Backward Angle Neutron Detector (BAND). United States: N. p., 2020.
Web. doi:10.1016/j.nima.2020.164356.
Segarra, E. P., Hauenstein, F., Schmidt, A., Price, K., Vega, I., Barlow, J., Barriga, E., Beck, A., Brooks, W., Cohen, E., Cruz-Torres, R., Denniston, A., Duer, M., Eugenio, P., Fogler, C., Hakobyan, H., Hartlove, T., Hrnjic, A., Korover, I., Kutz, T., May-Tal Beck, S., Nambrath, A., Ostrovidov, A., Piasetzky, E., Pybus, J. R., Ungerer, M., Weinstein, L. B., & Hen, O. The CLAS12 Backward Angle Neutron Detector (BAND). United States. https://doi.org/10.1016/j.nima.2020.164356
Segarra, E. P., Hauenstein, F., Schmidt, A., Price, K., Vega, I., Barlow, J., Barriga, E., Beck, A., Brooks, W., Cohen, E., Cruz-Torres, R., Denniston, A., Duer, M., Eugenio, P., Fogler, C., Hakobyan, H., Hartlove, T., Hrnjic, A., Korover, I., Kutz, T., May-Tal Beck, S., Nambrath, A., Ostrovidov, A., Piasetzky, E., Pybus, J. R., Ungerer, M., Weinstein, L. B., and Hen, O. Wed .
"The CLAS12 Backward Angle Neutron Detector (BAND)". United States. https://doi.org/10.1016/j.nima.2020.164356. https://www.osti.gov/servlets/purl/1642551.
@article{osti_1642551,
title = {The CLAS12 Backward Angle Neutron Detector (BAND)},
author = {Segarra, E. P. and Hauenstein, F. and Schmidt, A. and Price, K. and Vega, I. and Barlow, J. and Barriga, E. and Beck, A. and Brooks, W. and Cohen, E. and Cruz-Torres, R. and Denniston, A. and Duer, M. and Eugenio, P. and Fogler, C. and Hakobyan, H. and Hartlove, T. and Hrnjic, A. and Korover, I. and Kutz, T. and May-Tal Beck, S. and Nambrath, A. and Ostrovidov, A. and Piasetzky, E. and Pybus, J. R. and Ungerer, M. and Weinstein, L. B. and Hen, O.},
abstractNote = {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$/c_0$. 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. We report 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.},
doi = {10.1016/j.nima.2020.164356},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 978,
place = {United States},
year = {Wed Jul 22 00:00:00 EDT 2020},
month = {Wed Jul 22 00:00:00 EDT 2020}
}
Works referenced in this record:
The CLAS12 Data Acquisition System
journal, June 2020
- Boyarinov, S.; Raydo, B.; Cuevas, C.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 966
The CLAS12 superconducting magnets
journal, May 2020
- Fair, R.; Baltzell, N.; Bachimanchi, R.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 962
The CLAS12 Central Neutron Detector
journal, April 2020
- Chatagnon, P.; Bettane, J.; Hoballah, M.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 959
Laser calibration system for time of flight scintillator arrays
journal, September 2020
- Denniston, A.; Segarra, E. P.; Olivenboim, M.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 973
The CLAS12 Spectrometer at Jefferson Laboratory
journal, April 2020
- Burkert, V. D.; Elouadrhiri, L.; Adhikari, K. P.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 959
The CLAS12 Trigger System
journal, April 2020
- Raydo, B.; Boyarinov, S.; Celentano, A.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 960