Horn, M and Belov, VA and Akimov, DY and Araújo, HM and Barnes, EJ and Burenkov, AA and Chepel, V and Currie, A and Edwards, B and Ghag, C and Hollingsworth, A and Kalmus, GE and Kobyakin, AS and Kovalenko, AG and Lebedenko, VN and Lindote, A and Lopes, MI and Lüscher, R and Majewski, P and Murphy, AS and Neves, F and Paling, SM and Cunha, JPD and Preece, R and Quenby, JJ and Reichhart, L and Scovell, PR and Silva, C and Solovov, VN and Smith, NJT and Smith, PF and Stekhanov, VN and Sumner, TJ and Thorne, C and Viveiros, LD and Walker, RJ (2011) Nuclear recoil scintillation and ionisation yields in liquid xenon from ZEPLIN-III data.
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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.
|Title:||Nuclear recoil scintillation and ionisation yields in liquid xenon from ZEPLIN-III data|
|Additional information:||7 pages, 7 figures|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy|
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