First limit on WIMP cross section with low background CsI(Tℓ) crystal detector

DMRC and School of Physics, Seoul National University, Seoul 151-742, South Korea; Department of Physics, Sejong University, Seoul 143-747, South Korea; Physics Department, Yonsei University, Seoul 120-749, South Korea; Department of Science Education, Ewha Womans University, Seoul 120-750, South Korea; Physics Department, Kyungpook National University, Daegu 702-701, South Korea; Department of Engineering Physics, Tsinghua University, Beijing 100084, China; Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
Physics Letters B 10/2005; DOI: 10.1016/j.physletb.2005.12.035
Source: arXiv

ABSTRACT The Korea Invisible Mass Search (KIMS) Collaboration has been carrying out WIMP search experiment with CsI(Tℓ) crystal detectors at the YangYang Underground Laboratory. A successful reduction of the internal background of the crystal was done and a good pulse shape discrimination was achieved. We report the first result on WIMP search obtained with 237 kg days data using one full-size CsI(Tℓ) crystal of 6.6 kg mass.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The nu¯e-e- elastic scattering cross section was measured with a CsI(Tl) scintillating crystal array having a total mass of 187 kg. The detector was exposed to an average reactor nu¯e flux of 6.4×1012cm-2s-1 at the Kuo-Sheng Nuclear Power Station. The experimental design, conceptual merits, detector hardware, data analysis, and background understanding of the experiment are presented. Using 29882/7369kg-days of Reactor ON/OFF data, the standard model (SM) electroweak interaction was probed at the squared 4-momentum transfer range of Q2˜3×10-6GeV2. The ratio of experimental to SM cross sections of xi=[1.08±0.21(stat)±0.16(sys)] was measured. Constraints on the electroweak parameters (gV,gA) were placed, corresponding to a weak mixing angle measurement of sinf 2thetaW=0.251±0.031(stat)±0.024(sys). Destructive interference in the SM nu¯e-e process was verified. Bounds on anomalous neutrino electromagnetic properties were placed: neutrino magnetic moment at munu¯e
    Physical Review D 01/2010; 81:072001. · 4.69 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Asian underground facilities are reviewed. The YangYang underground Laboratory in Korea and the Kamioka observatory in Japan are operational and several astrophysical experiments are running. Indian Neutrino Observatory(INO) and China JinPing Underground Laboratory (CJPL) are under construction and underground experiments are being prepared. Current activities and future prospects at those underground sites are described.
    AIP Conference Proceedings. 04/2011; 1338(1):20-27.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Our 14C AMS activities have attained an annual throughput of ca. 1000 unknowns, however our 10Be AMS system development has not been completed yet. Meanwhile, we have diversified our research activities to other areas related to 14C AMS in order to broaden the application of our accelerator and to provide additional support to the local archeological community. An external beam PIXE system has been constructed on our MPS beam-line and obsidians from Paleolithic sites were investigated for provenance studies. The results showed that PIXE measurements of obsidians, when combined with neutron activation analysis, is a very powerful tool for provenance studies. Measurements of the natural radioactivity of the U-series have been carried out, not only for U/Th bone dating, but also as an investigation of a possibility of characterizing paleosols from various Paleolithic sites. The criteria for the validity of 14C ages derived from soil organics have been obtained. As an example of the successful application of our 14C AMS facility, the dating of burials at the Tavan Tolgoi site in Mongolia, containing the burials of artifacts from the era of Chinggis Khan, is described.
    Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 06/2007; 259(1):57-61. · 1.19 Impact Factor

Full-text (5 Sources)

Available from
May 21, 2014