eprintid: 1352150
rev_number: 30
eprint_status: archive
userid: 608
dir: disk0/01/35/21/50
datestamp: 2012-07-04 18:43:47
lastmod: 2021-09-20 00:29:08
status_changed: 2018-06-05 13:08:04
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Alner, GJ
creators_name: Araujo, HM
creators_name: Bewick, A
creators_name: Bungau, C
creators_name: Camanzi, B
creators_name: Carson, MJ
creators_name: Cashmore, RJ
creators_name: Chagani, H
creators_name: Chepel, V
creators_name: Cline, D
creators_name: Davidge, D
creators_name: Davies, JC
creators_name: Daw, E
creators_name: Dawson, J
creators_name: Durkin, T
creators_name: Edwards, B
creators_name: Gamble, T
creators_name: Gao, J
creators_name: Ghag, C
creators_name: Howard, AS
creators_name: Jones, WG
creators_name: Joshi, M
creators_name: Korolkova, EV
creators_name: Kudryavtsev, VA
creators_name: Lawson, T
creators_name: Lebedenko, VN
creators_name: Lewin, JD
creators_name: Lightfoot, P
creators_name: Lindote, A
creators_name: Liubarsky, I
creators_name: Lopes, MI
creators_name: Luescher, R
creators_name: Majewski, P
creators_name: Mavrokoridis, K
creators_name: McMillan, JE
creators_name: Morgan, B
creators_name: Muna, D
creators_name: Murphy, ASJ
creators_name: Neves, F
creators_name: Nicklin, GG
creators_name: Ooi, W
creators_name: Paling, SM
creators_name: da Cunha, JP
creators_name: Plank, SJS
creators_name: Preece, RM
creators_name: Quenby, JJ
creators_name: Robinson, M
creators_name: Salinas, G
creators_name: Sergiampietri, F
creators_name: Silva, C
creators_name: Solovov, VN
creators_name: Smith, NJT
creators_name: Smith, PF
creators_name: Spooner, NJC
creators_name: Sumner, TJ
creators_name: Thorne, C
creators_name: Tovey, DR
creators_name: Tziaferi, E
creators_name: Walker, RJ
creators_name: Wang, H
creators_name: White, JT
creators_name: Wolfs, FLH
title: First limits on WIMP nuclear recoil signals in ZEPLIN-II: A two-phase xenon detector for dark matter detection
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F60
keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, astronomy & astrophysics, physics, particles & fields, zeplin-ii, dark matter, WIMPs, liquid xenon, radiation detectors, liquid xenon, scintillation efficiency, energy, electrons, argon
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: Results are presented from the first underground data run of ZEPLIN-II, a 31 kg two-phase xenon detector developed to observe nuclear recoils from hypothetical weakly interacting massive dark matter particles. Discrimination between nuclear recoils and background electron recoils is afforded by recording both the scintillation and ionisation signals generated within the liquid xenon, with the ratio of these signals being different for the two classes of event. This ratio is calibrated for different incident species using an AmBe neutron source and 60Co γ-ray sources. From our first 31 live days of running ZEPLIN-II, the total exposure following the application of fiducial and stability cuts was 225 kg × days. A background population of radon progeny events was observed in this run, arising from radon emission in the gas purification getters, due to radon daughter ion decays on the surfaces of the walls of the chamber. An acceptance window, defined by the neutron calibration data, of 50% nuclear recoil acceptance between 5 keVee and 20 keVee, had an observed count of 29 events, with a summed expectation of 28.6 ± 4.3 γ-ray and radon progeny induced background events. These figures provide a 90% c.l. upper limit to the number of nuclear recoils of 10.4 events in this acceptance window, which converts to a WIMP–nucleon spin-independent cross-section with a minimum of 6.6 × 10−7 pb following the inclusion of an energy-dependent, calibrated, efficiency. A second run is currently underway in which the radon progeny will be eliminated, thereby removing the background population, with a projected sensitivity of 2 × 10−7 pb for similar exposures as the first run.
date: 2007-11
publisher: ELSEVIER SCIENCE BV
official_url: https://doi.org/10.1016/j.astropartphys.2007.06.002
vfaculties: VMPS
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_source: WoS-Lite
elements_id: 376787
doi: 10.1016/j.astropartphys.2007.06.002
lyricists_name: Ghag, Chamkaur
lyricists_id: CGHAG64
full_text_status: public
publication: Astroparticle Physics
volume: 28
number: 3
pagerange: 287-302
pages: 16
issn: 0927-6505
citation:        Alner, GJ;    Araujo, HM;    Bewick, A;    Bungau, C;    Camanzi, B;    Carson, MJ;    Cashmore, RJ;                                                                                                                                                                                                                             ... Wolfs, FLH; + view all <#>        Alner, GJ;  Araujo, HM;  Bewick, A;  Bungau, C;  Camanzi, B;  Carson, MJ;  Cashmore, RJ;  Chagani, H;  Chepel, V;  Cline, D;  Davidge, D;  Davies, JC;  Daw, E;  Dawson, J;  Durkin, T;  Edwards, B;  Gamble, T;  Gao, J;  Ghag, C;  Howard, AS;  Jones, WG;  Joshi, M;  Korolkova, EV;  Kudryavtsev, VA;  Lawson, T;  Lebedenko, VN;  Lewin, JD;  Lightfoot, P;  Lindote, A;  Liubarsky, I;  Lopes, MI;  Luescher, R;  Majewski, P;  Mavrokoridis, K;  McMillan, JE;  Morgan, B;  Muna, D;  Murphy, ASJ;  Neves, F;  Nicklin, GG;  Ooi, W;  Paling, SM;  da Cunha, JP;  Plank, SJS;  Preece, RM;  Quenby, JJ;  Robinson, M;  Salinas, G;  Sergiampietri, F;  Silva, C;  Solovov, VN;  Smith, NJT;  Smith, PF;  Spooner, NJC;  Sumner, TJ;  Thorne, C;  Tovey, DR;  Tziaferi, E;  Walker, RJ;  Wang, H;  White, JT;  Wolfs, FLH;   - view fewer <#>    (2007)    First limits on WIMP nuclear recoil signals in ZEPLIN-II: A two-phase xenon detector for dark matter detection.                   Astroparticle Physics , 28  (3)   pp. 287-302.    10.1016/j.astropartphys.2007.06.002 <https://doi.org/10.1016/j.astropartphys.2007.06.002>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1352150/1/Ghag_0701858v2.pdf