A measurement of the scintillation decay time constant of nuclear recoils in liquid xenon with the XMASS-I detector

The XMASS collaboration

研究成果: Article査読

6 被引用数 (Scopus)

抄録

We report an in-situ measurement of the nuclear recoil (NR) scintillation decay time constant in liquid xenon (LXe) using the XMASS-I detector at the Kamioka underground laboratory in Japan. XMASS-I is a large single-phase LXe scintillation detector whose purpose is the direct detection of dark matter via NR which can be induced by collisions between Weakly Interacting Massive Particles (WIMPs) and a xenon nucleus. The inner detector volume contains 832 kg of LXe. 252 Cf was used as an external neutron source for irradiating the detector. The scintillation decay time constant of the resulting neutron induced NR was evaluated by comparing the observed photon detection times with Monte Carlo simulations. Fits to the decay time prefer two decay time components, one for each of the Xe 2 singlet and triplet states, with τ S = 4.3 ± 0.6 ns taken from prior research, τ T was measured to be 26.9 +0.7 -1.1 ns with a singlet state fraction F S of 0.252 +0.027 -0.019 . We also evaluated the performance of pulse shape discrimination between NR and electron recoil (ER) with the aim of reducing the electromagnetic background in WIMP searches. For a 50% NR acceptance, the ER acceptance was 13.7±1.0% and 4.1±0.7% in the energy ranges of 5-10 keV ee and 10-15 keV ee , respectively.

本文言語English
論文番号P12032
ジャーナルJournal of Instrumentation
13
12
DOI
出版ステータスPublished - 2018 12月 20
外部発表はい

ASJC Scopus subject areas

  • 数理物理学
  • 器械工学

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