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An improved evaluation of the neutron background in the PandaX-II experiment
- Source :
- SCIENCE CHINA Physics, Mechanics & Astronomy; March 2020, Vol. 63 Issue: 3
- Publication Year :
- 2020
-
Abstract
- In dark matter direct detection experiments, neutron is a serious source of background, which can mimic the dark matter-nucleus scattering signals. In this paper, we present an improved evaluation of the neutron background in the PandaX-II dark matter experiment by a novel approach. Instead of fully relying on the Monte Carlo simulation, the overall neutron background is determined from the neutron-induced high energy signals in the data. In addition, the probability of producing a dark-matter-like background per neutron is evaluated with a complete Monte Carlo generator, where the correlated emission of neutron(s) and γ(s) in the (α, n) reactions and spontaneous fissions is taken into consideration. With this method, the neutron backgrounds in the Run 9 (26-ton-day) and Run 10 (28-ton-day) data sets of PandaX-II are estimated to be (0.66±0.24) and (0.47±0.25) events, respectively.
Details
- Language :
- English
- ISSN :
- 16747348 and 18691927
- Volume :
- 63
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- SCIENCE CHINA Physics, Mechanics & Astronomy
- Publication Type :
- Periodical
- Accession number :
- ejs52232523
- Full Text :
- https://doi.org/10.1007/s11433-019-9603-9