Title: Cherenkov and scintillation separation in water-based liquid scintillator using an LAPPDTM

Abstract

This manuscript describes measurements of water-based liquid scintillators (WbLS), demonstrating separation of the Cherenkov and scintillation components using a low energy β source and the fast timing response of a Large Area Picosecond Photodetector (LAPPD). Additionally, the time profiles of three WbLS mixtures, defined by the relative fractions of scintillating compound, are characterized, with improved sensitivity to the scintillator rise-time. The measurements were made using both an LAPPD and a conventional photomultiplier tube (PMT). All samples were measured with an effective resolution O(100 ps), which allows for the separation of Cherenkov and scintillation light (henceforth C/S separation) by selecting on the arrival time of the photons alone. The Cherenkov purity of the selected photons is greater than 60% in all cases, with greater than 80% achieved for a sample containing 1% scintillator. This is the first demonstration of the power of synthesizing low light yield scintillators, of which WbLS is the canonical example, with fast photodetectors, of which LAPPDs are an emerging leader, and has direct implication for future mid- and large-scale detectors, such as Theia, ANNIE, and AIT-NEO.

Authors:

Kaptanoglu, T. ;

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Callaghan, E. J.; Yeh, M.; Orebi Gann, G. D.

Publication Date:

Thu Feb 24 00:00:00 EST 2022

Research Org.:

Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development; USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1846326

Alternate Identifier(s):

OSTI ID: 1863876; OSTI ID: 1897634

Report Number(s):

BNL-222899-2022-JAAM
Journal ID: ISSN 1434-6044; 169; PII: 10087

Grant/Contract Number:  

AC02-05CH11231; AC02-98CH10886; NA0003920; SC0018974; SC0012704

Resource Type:

Published Article

Journal Name:

European Physical Journal. C, Particles and Fields

Additional Journal Information:

Journal Name: European Physical Journal. C, Particles and Fields Journal Volume: 82 Journal Issue: 2; Journal ID: ISSN 1434-6044

Publisher:

Springer Science + Business Media

Country of Publication:

Germany

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS