The CLAS12 Backward Angle Neutron Detector (BAND)

E. P. Segarra; F. Hauenstein; A. Schmidt; K. Price; I. Vega; J. Barlow; E. Barriga; A. Beck; W. Brooks; E. Cohen; R. Cruz-Torres; A. Denniston; M. Duer; P. Eugenio; C. Fogler; H. Hakobyan; T. Hartlove; A. Hrnjic; I. Korover; T. Kutz; S. May-Tal Beck; A. Nambrath; A. Ostrovidov; E. Piasetzky; J. R. Pybus; M. Ungerer; L. B. Weinstein; O. Hen

doi:10.1016/j.nima.2020.164356

The CLAS12 Backward Angle Neutron Detector (BAND)

E. P. Segarra, F. Hauenstein, A. Schmidt, K. Price, I. Vega, J. Barlow, E. Barriga, A. Beck, W. Brooks, E. Cohen, R. Cruz-Torres, A. Denniston, M. Duer, P. Eugenio, C. Fogler, H. Hakobyan, T. Hartlove, A. Hrnjic, I. Korover, T. KutzS. May-Tal Beck, A. Nambrath, A. Ostrovidov, E. Piasetzky, J. R. Pybus, M. Ungerer, L. B. Weinstein, O. Hen

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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.

Original language	English
Article number	164356
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	978
DOIs	https://doi.org/10.1016/j.nima.2020.164356
State	Published - 21 Oct 2020
Externally published	Yes

Keywords

CLAS12
Plastic scintillator
Time of flight
Ultrafast neutrons

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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10.1016/j.nima.2020.164356

Cite this

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., ... Hen, O. (2020). The CLAS12 Backward Angle Neutron Detector (BAND). Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 978, Article 164356. https://doi.org/10.1016/j.nima.2020.164356

@article{8f057bbf51e14d17957aca8e235434bf,

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/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.",

keywords = "CLAS12, Plastic scintillator, Time of flight, Ultrafast neutrons",

author = "Segarra, {E. P.} and F. Hauenstein and A. Schmidt and K. Price and I. Vega and J. Barlow and E. Barriga and A. Beck and W. Brooks and E. Cohen and R. Cruz-Torres and A. Denniston and M. Duer and P. Eugenio and C. Fogler and H. Hakobyan and T. Hartlove and A. Hrnjic and I. Korover and T. Kutz and {May-Tal Beck}, S. and A. Nambrath and A. Ostrovidov and E. Piasetzky and Pybus, {J. R.} and M. Ungerer and Weinstein, {L. B.} and O. Hen",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

month = oct,

day = "21",

doi = "10.1016/j.nima.2020.164356",

language = "English",

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Segarra, EP, 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, JR, Ungerer, M, Weinstein, LB & Hen, O 2020, 'The CLAS12 Backward Angle Neutron Detector (BAND)', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 978, 164356. https://doi.org/10.1016/j.nima.2020.164356

TY - JOUR

T1 - The CLAS12 Backward Angle Neutron Detector (BAND)

AU - Segarra, E. P.

AU - Hauenstein, F.

AU - Schmidt, A.

AU - Price, K.

AU - Vega, I.

AU - Barlow, J.

AU - Barriga, E.

AU - Beck, A.

AU - Brooks, W.

AU - Cohen, E.

AU - Cruz-Torres, R.

AU - Denniston, A.

AU - Duer, M.

AU - Eugenio, P.

AU - Fogler, C.

AU - Hakobyan, H.

AU - Hartlove, T.

AU - Hrnjic, A.

AU - Korover, I.

AU - Kutz, T.

AU - May-Tal Beck, S.

AU - Nambrath, A.

AU - Ostrovidov, A.

AU - Piasetzky, E.

AU - Pybus, J. R.

AU - Ungerer, M.

AU - Weinstein, L. B.

AU - Hen, O.

PY - 2020/10/21

Y1 - 2020/10/21

N2 - 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.

AB - 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.

KW - CLAS12

KW - Plastic scintillator

KW - Time of flight

KW - Ultrafast neutrons

UR - http://www.scopus.com/inward/record.url?scp=85088924051&partnerID=8YFLogxK

U2 - 10.1016/j.nima.2020.164356

DO - 10.1016/j.nima.2020.164356

M3 - Article

AN - SCOPUS:85088924051

SN - 0168-9002

VL - 978

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

M1 - 164356

ER -

The CLAS12 Backward Angle Neutron Detector (BAND)

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