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20 April 2024

» arxiv » 1106.0694

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Nuclear recoil scintillation and ionisation yields in liquid xenon from ZEPLIN-III data
M. Horn ; V. A. Belov ; D. Yu. Akimov ; H. M. Araújo ; E. J. Barnes ; A. A. Burenkov ; V. Chepel ; A. Currie ; B. Edwards ; C. Ghag ; A. Hollingsworth ; G. E. Kalmus ; A. S. Kobyakin ; A. G. Kovalenko ; V. N. Lebedenko ; A. Lindote ; M. I. Lopes ; R. Lüscher ; P. Majewski ; A. StJ. Murphy ; F. Neves ; S. M. Paling ; J. Pinto da Cunha ; R. Preece ; J. J. Quenby ; L. Reichhart ; P. R. Scovell ; C. Silva ; V. N. Solovov ; N. J. T. Smith ; P. F. Smith ; V. N. Stekhanov ; T. J. Sumner ; C. Thorne ; L. de Viveiros ; R. J. Walker ;
Date:	3 Jun 2011
Abstract:	Scintillation and ionisation yields for nuclear recoils in liquid xenon above 10 keVnr (nuclear recoil energy) are deduced from data acquired using broadband Am-Be neutron sources. The nuclear recoil data from several exposures to two sources were compared to detailed simulations. Energy-dependent scintillation and ionisation yields giving acceptable fits to the data were derived. Efficiency and resolution effects are treated using a light collection Monte Carlo, measured photomultiplier response profiles and hardware trigger studies. A gradual fall in scintillation yield below ~40 keVnr is found, together with a rising ionisation yield; both are in good agreement with the latest independent measurements. The analysis method is applied to both the most recent ZEPLIN-III data, acquired with a significantly upgraded detector and a precision-calibrated Am-Be source, as well as to the earlier data from the first run in 2008. A new method for deriving the recoil scintillation yield, which includes sub-threshold S1 events, is also presented which confirms the main analysis.
Source:	arXiv, 1106.0694
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