The CLAS12 Backward Angle Neutron Detector (BAND)

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.

doi:10.1016/j.nima.2020.164356

Title: 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:

Segarra, E. P. ^[1]; Hauenstein, F. ^[1]; Schmidt, A. ^[1]; Price, K. ^[2]; Vega, I. ^[3]; Barlow, J. ^[4]; Barriga, E. ^[4]; Beck, A. ^[1]; Brooks, W. ^[3]; Cohen, E. ^[5]; Cruz-Torres, R. ^[1]; Denniston, A. ^[1]; Duer, M. ^[5]; Eugenio, P. ^[4]; Fogler, C. ^[2]; Hakobyan, H. ^[3]; Hartlove, T. ^[2]; Hrnjic, A. ^[1]; Korover, I. ^[6]; Kutz, T. ^[1] more »

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:: Wed Jul 22 00:00:00 EDT 2020

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.

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                    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

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                    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.

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@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}

}

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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
DOI: 10.1016/j.nima.2020.163698

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
DOI: 10.1016/j.nima.2020.163578

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
DOI: 10.1016/j.nima.2020.163441

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
DOI: 10.1016/j.nima.2020.164177

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
DOI: 10.1016/j.nima.2020.163419

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
DOI: 10.1016/j.nima.2020.163529

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Title: The CLAS12 Backward Angle Neutron Detector (BAND)

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