|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The ZEPLIN-III Anti-Coincidence Veto Detector | | D.Yu. Akimov
; H.M. Araúo
; E.J. Barnes
; V.A. Belov
; A.A. Burenkov
; V. Chepel
; A. Currie
; B. Edwards
; V. Francis
; C. Ghag
; A. Hollingsworth
; M. Horn
; G.E. Kalmus
; A.S. Kobyakin
; A.G. Kovalenko
; V.N. Lebedenko
; A. Lindote
; M.I. Lopes
; R. Lüscher
; K. Lyons
; P. Majewski
; A.St J. Murphy
; F. Neves
; S.M. Paling
; J. Pinto da Cunha
; R. Preece
; J.J. Quenby
; L. Reichhart
; P.R. Scovell
; V.N. Solovov
; N.J.T. Smith
; P.F. Smith
; V.N. Stekhanov
; T.J. Sumner
; R. Taylor
; C. Thorne
; R.J. Walker
; | | Date: |
23 Apr 2010 | | Abstract: | 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
approx0.4 to approx0.14 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 gamma-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 1E-8 pb to be
probed. | | Source: | arXiv, 1004.4207 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER