Imperial College London

ProfessorTimothySumner

Faculty of Natural SciencesDepartment of Physics

Professor of Experimental Astrophysics
 
 
 
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Contact

 

+44 (0)20 7594 7552t.sumner

 
 
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Location

 

1108Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ghag:2011:10.1016/j.astropartphys.2011.06.006,
author = {Ghag, C and Akimov, DY and Araujo, HM and Barnes, EJ and Belov, VA and Burenkov, AA and Chepel, V and Currie, A and DeViveiros, L and Edwards, B and Francis, V 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 Pinto, da Cunha J 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 Walker, RJ},
doi = {10.1016/j.astropartphys.2011.06.006},
journal = {Astroparticle Physics},
pages = {76--86},
title = {Performance of the veto detector incorporated into the ZEPLIN-III experiment},
url = {http://dx.doi.org/10.1016/j.astropartphys.2011.06.006},
volume = {35},
year = {2011}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The ZEPLIN-III experiment is operating in its second phase at the Boulby Underground Laboratory in search of dark matter WIMPs. The major upgrades to the instrument over its first science run include lower background photomultiplier tubes and installation of a plastic scintillator veto system. Performance results from the veto detector using calibration and science data in its first six months of operation in coincidence with ZEPLIN-III are presented. With fully automated operation and calibration, the veto system has maintained high stability and achieves near unity live time relative to ZEPLIN-III. Calibrations with a neutron source demonstrate a rejection of 60% of neutron-induced nuclear recoils in ZEPLIN-III that might otherwise be misidentified as WIMPs. This tagging efficiency reduces the expected untagged nuclear recoil background from neutrons during science data taking to a very low rate of 0.2 events per year in the WIMP acceptance region. Additionally, the veto detector provides rejection of 28% of γ-ray induced background events, allowing the sampling of the dominant source of background in ZEPLIN-III – multiple scatter γ-rays with rare topologies. Since WIMPs will not be tagged by the veto detector, and tags due to γ-rays and neutrons are separable, this population of multiple scatter events may be characterised without biasing the analysis of candidate WIMP signals in the data.
AU - Ghag,C
AU - Akimov,DY
AU - Araujo,HM
AU - Barnes,EJ
AU - Belov,VA
AU - Burenkov,AA
AU - Chepel,V
AU - Currie,A
AU - DeViveiros,L
AU - Edwards,B
AU - Francis,V
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 - Pinto,da Cunha J
AU - Preece,R
AU - Quenby,JJ
AU - Reichhart,L
AU - Scovell,PR
AU - Silva,C
AU - Solovov,VN
AU - Smith,NJT
AU - Smith,PF
AU - Stekhanov,VN
AU - Sumner,TJ
AU - Thorne,C
AU - Walker,RJ
DO - 10.1016/j.astropartphys.2011.06.006
EP - 86
PY - 2011///
SN - 1873-2852
SP - 76
TI - Performance of the veto detector incorporated into the ZEPLIN-III experiment
T2 - Astroparticle Physics
UR - http://dx.doi.org/10.1016/j.astropartphys.2011.06.006
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000296406400005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/37049
VL - 35
ER -