Study of fast neutron detector for COSINE-100 experiment

Abstract

A monitoring system for fast neutrons is planned in the COSINE experiment, a dark matter experiment with NaI crystals. We pursued several R&D approaches for a neutron detector using a liquid scintillator (LS). A pulse shape discrimination (PSD) technique is used for the identification of neutron events and the PSD properties of two different LS were compared. A good separation power between neutrons and $\gamma$ has been achieved for energies between 200 keVee to 1500 keVee. The combination of alumina adsorption, filtration, and water extraction is effective in purifying the LS, which leads to a reduction in the $\alpha$ contamination by ${}^{210}$Po of more than a factor of two. The measured activities of the internal $\alpha$ are 0.36$\pm$0.04~mBq/kg and 0.21$\pm$0.03~mBq/kg before and after purification, respectively.

References in corpus (7)

• New results from DAMA/LIBRA
• Final model independent result of DAMA/LIBRA-phase1
• Initial Performance of the COSINE-100 Experiment
• No role for muons in the DAMA annual modulation results
• Tests on NaI(Tl) crystals for WIMP search at the Yangyang Underground Laboratory
• Understanding NaI(Tl) crystal background for dark matter searches
• Muon detector for the COSINE-100 experiment

Cited by in corpus (6)

• Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment
• Lowering the energy threshold in COSINE-100 dark matter searches
• Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment
• The COSINE-100 Liquid Scintillator Veto System
• DAMA/LIBRA annual modulation and Axion Quark Nugget Dark Matter Model
• The environmental monitoring system at the COSINE-100 experiment