Optimum lithium loading of a liquid scintillator for neutron and neutrino detection
Hans Pieter Mumm, Denis E. Bergeron, Mark Tyra, Jerome LaRosa, Svetlana Nour, T.J. Langford, Dimitry A. Pushin
Neutral particle detection in high-background environments is greatly aided by the ability to easily load 6Li into liquid scintillators. We describe a readily available and inexpensive liquid scintillation cocktail stably loaded with up to 1 % Li by mass. Compositions that give thermodynamically stable microemulsions (reverse-micellar systems) were explored, using a Comp-ton spectrum quenching technique to distinguish these from unstable emulsions. Scintillation light yield and transmittance were characterized. Pulse shape discrimination (PSD) was measured using a 252Cf source, showing that electronic-like and proton-like recoil events are well-resolved even for Li loading up to 1 %, providing a means of background suppression in neutron/neutrino detectors. While samples in this work were prepared with natLi (7.59 %6Li), the neutron capture peak was clearly visible in the PSD spectrum; this implies that while extremely high capture efficiency could be achieved with6Li-enriched material, a very inexpensive neutron-sensitive detector can be prepared with natLi.
Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment
, Bergeron, D.
, Tyra, M.
, LaRosa, J.
, Nour, S.
, Langford, T.
and Pushin, D.
Optimum lithium loading of a liquid scintillator for neutron and neutrino detection, Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment, [online], https://doi.org/10.1016/j.nima.2019.163126, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928466
(Accessed November 29, 2023)