Imperial College London

ProfessorTimothySumner

Faculty of Natural SciencesDepartment of Physics

Professor of Experimental Astrophysics
 
 
 
//

Contact

 

+44 (0)20 7594 7552t.sumner

 
 
//

Location

 

1108Blackett LaboratorySouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Akimov:2010:10.1016/j.astropartphys.2010.06.010,
author = {Akimov, DY and Araujo, HM and Barnes, EJ and Belov, VA and Burenkov, AA and Chepel, V and Currie, A and Edwards, B and Francis, V and Ghag, C and Hollingsworth, A and Horn, M and Kalmus, GE and Kobyakin, AS and Kovalenko, AG and Lebedenko, VN and Lindote, A and Lopes, MI and Luescher, R and Lyons, K and Majewski, P and Murphy, ASJ and Neves, F and Paling, SM and da, Cunha JP and Preece, R and Quenby, JJ and Reichhart, L and Scovell, PR and Solovov, VN and Smith, NJT and Smith, PF and Stekhanov, VN and Sumner, TJ and Taylor, R and Thorne, C and Walker, RJ},
doi = {10.1016/j.astropartphys.2010.06.010},
journal = {Astroparticle Physics},
pages = {151--163},
title = {The ZEPLIN-III anti-coincidence veto detector},
url = {http://dx.doi.org/10.1016/j.astropartphys.2010.06.010},
volume = {34},
year = {2010}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The design, optimisation and construction of an anti-coincidence veto detector to complement the ZEPLIN-III direct dark matter search instrument is described. One tonne of plastic scintillator is arranged into 52 bars individually read out by photomultipliers and coupled to a gadolinium-loaded passive polypropylene shield. Particular attention has been paid to radiological content. The overall aim has been to achieve a veto detector of low threshold and high efficiency without the creation of additional background in ZEPLIN-III, all at a reasonable cost. Extensive experimental measurements of the components have been made, including radioactivity levels and performance characteristics. These have been used to inform a complete end-to-end Monte Carlo simulation that has then been used to calculate the expected performance of the new instrument, both operating alone and as an anti-coincidence detector for ZEPLIN-III. The veto device will be capable of rejecting over 65% of coincident nuclear recoil events from neutron background in the energy range of interest in ZEPLIN-III. This will reduce the background in ZEPLIN-III from 0.4 to 0.14 events per year in the WIMP acceptance region, a significant factor in the event of a non-zero observation. Furthermore, in addition to providing valuable diagnostic capabilities, the veto is capable of tagging over 15% for γ-ray rejection, all whilst contributing no significant additional background. In conjunction with the replacement of the internal ZEPLIN-III photomultiplier array, the new veto is expected to improve significantly the sensitivity of the ZEPLIN-III instrument to dark matter, allowing spin-independent WIMP-nucleon cross sections below 10−8 pb to be probed.
AU - Akimov,DY
AU - Araujo,HM
AU - Barnes,EJ
AU - Belov,VA
AU - Burenkov,AA
AU - Chepel,V
AU - Currie,A
AU - Edwards,B
AU - Francis,V
AU - Ghag,C
AU - Hollingsworth,A
AU - Horn,M
AU - Kalmus,GE
AU - Kobyakin,AS
AU - Kovalenko,AG
AU - Lebedenko,VN
AU - Lindote,A
AU - Lopes,MI
AU - Luescher,R
AU - Lyons,K
AU - Majewski,P
AU - Murphy,ASJ
AU - Neves,F
AU - Paling,SM
AU - da,Cunha JP
AU - Preece,R
AU - Quenby,JJ
AU - Reichhart,L
AU - Scovell,PR
AU - Solovov,VN
AU - Smith,NJT
AU - Smith,PF
AU - Stekhanov,VN
AU - Sumner,TJ
AU - Taylor,R
AU - Thorne,C
AU - Walker,RJ
DO - 10.1016/j.astropartphys.2010.06.010
EP - 163
PY - 2010///
SN - 1873-2852
SP - 151
TI - The ZEPLIN-III anti-coincidence veto detector
T2 - Astroparticle Physics
UR - http://dx.doi.org/10.1016/j.astropartphys.2010.06.010
UR - http://hdl.handle.net/10044/1/37051
VL - 34
ER -