| An improved evaluation of the neutron background in the PandaX-Ⅱ experiment |
| |
| 作者单位： | Shanghai Institute of Applied Physics;INPAC and School of Physics and Astronomy;Yalong River Hydropower Development Company;School of Physics;School of Physics&International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear Materials and Physics;School of Medical Instrument and Food Engineering;Tsung-Dao Lee Institute;School of Mechanical Engineering;School of Physics;Department of Physics;School of Physics and Key Laboratory of Particle Physics and Particle Irradiation（MOE）;Center of High Energy Physics;University of Chinese Academy of Sciences |
| |
| 基金项目： | supported by the Double Top-class of Shanghai Jiao Tong University,the National Natural Science Foundation of China(Grant Nos.11435008,11505112,11525522,11775141,and 11755001);the Ministry of Science and Technology of China(Grant No.2016YFA0400301);the Office of Science and Technology,Shanghai Municipal Government(Grant Nos.11DZ2260700,16DZ2260200,and 18JC1410200);the Key Laboratory for Particle Physics,Astrophysics and Cosmology,Ministry of Education,for important support;the Chinese Academy of Sciences Center for Excellence in Particle Physics(CCEPP);Hongwen Foundation in Hong Kong;we thank the CJPL administration and the Yalong River Hydropower Development Company Ltd.for indispensable logistical support and other help. |
| |
| 摘 要： | 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)andγ(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.
|
| 关 键 词： | DARK matter direct detection XENON NEUTRON BACKGROUND high energy GAMMA NEUTRON GENERATOR |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
