Performance of a Chamber for Studying the Liquid Xenon Response to Nuclear Recoils
V. Chepel, F. Neves, V. Solovov, A. Pereira, M. I. Lopes, J. Pinto da Cunha, P. Mendes, A. Lindote, C. P. Silva, R. Ferreira Marques, A. J. P. L. Policarpo
Abstract
The design and performance of a 1.2 liter liquid xenon chamber equipped with 7 two-inch photomultiplier tubes, with the purpose of studying the scintillation response of xenon to gamma-rays and neutrons, is described. Measurements with gamma-rays indicate a high VUV light collection efficiency resulting in ~5.5 photoelectrons per 1 keV of deposited energy. The energy resolution (FWHM) is 18% and 22%, for 122 keV and 511 keV gamma-rays, respectively. An algorithm for the reconstruction of the scintillation coordinates in (x,y) plane was developed and tested. The position resolution is estimated to be 6.9 mm (sigma) for 122 keV gamma-rays.
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