Shih-Chang Lee

A CsI(Tl) scintillating crystal detector for the studies of low-energy neutrino interactions

Abstract Scintillating crystal detector may offer some potential advantages in the low-energy, low-background experiments. A 500 kg CsI(Tl) detector to be placed near the core of Kuo-sheng Nuclear Power Station in Taiwan is being constructed for the studies of electron–neutrino scatterings and other keV–MeV range neutrino interactions. The motivations of this detector approach, the physics to be addressed, the basic experimental design, and the characteristic performance of prototype modules are described. The expected background channels and their experimental handles are discussed.Scintillating crystal detector may offer some potential advantages in the low-energy, low-background experiments. A 500 kg CsI(Tl) detector to be placed near the core of Nuclear Power Station II in Taiwan is being constructed for the studies of electron-neutrino scatterings and other keV−MeV range neutrino interactions. The motivations of this detector approach, the physics to be addressed, the basic experimental design, and the characteristic performance of prototype modules are described. The expected background channels and their experimental handles are discussed. PACS Codes: 14.60.Pq; 29.40.Mc

Radiation hardness and lifetime studies of the VCSELs for the ATLAS SemiConductor Tracker

Studies have been performed on the radiation hardness of the type of VCSELs 2 that will be used in the ATLAS SemicConductor Tracker. The measurements were made using 30 MeVproton beams, 24 GeV /c proton beams and a gamma source. The lifetime of the devices after irradiation was studied. r 2002 Elsevier Science B.V. All rights reserved.

Proposal for Detecting Top Spin Correlation Effects at the Fermilab Tevatron.

We propose to observe the top spin correlation effect at Tevatron through the measurement of the correlated asymmetries of the charged lepton momenta using the dilepton decay events of top and anti-top quark pairs. The possibility of reconstructing the events and observing the asymmetries at 3σ level with projected luminosity of the Tevatron for Run II is demonstrated by simulation. The effect can provide the first direct measurement of the spin of

The AMS-01 Aerogel Threshold Cherenkov counter

Abstract The Alpha Magnetic Spectrometer in a precursor version (AMS-01), was flown in June 1998 on a 51.6° orbit and at altitudes ranging between 320 and 390 km , on board of the space shuttle Discovery (flight STS-91). AMS-01 included an Aerogel Threshold Cherenkov counter (ATC) to separate p from e − and e + from p, for momenta below 3.5 GeV /c . This paper presents a description of the ATC counter and reports on its performances during the flight STS-91.

Optical data links for the ATLAS SCT and Pixel Detector

Abstract ATLAS (The ATLAS Technical Proposal, CERN/LHCC 94-33) is one of the large electronic particle detectors at LHC (The LHC Conceptual Design, Report- The Yellow Book, CERN/AC/95-05(LHC)) which will become operational in 2005. It is planned to use radiation tolerant optical links for the data transfer from the SemiConductor Tracker (SCT) (ATLAS Inner Detector Technical Proposal, CERN/LHCC 97-16 & CERN/LHCC 97-17). and Pixel Detector (ATLAS Pixel Detector Technical Proposal, CERN/LHCC 98-13) systems to the acquisition electronics over a distance up to 140m. The overall architecture and the performance of these optical data links are described. One of the three candidate designs for an on-detector Opto-Package is presented.

Preliminary results from the prototype Synchrotron Radiation Detector on Space Shuttle mission STS-108

Abstract A Synchrotron Radiation Detector measures synchrotron radiation emitted by high energetic particles in the earth magnetic field. This allows to identify cosmic ray electrons and positrons with energies in the TeV region. One possibility for such a detector outside the atmosphere uses YAP crystals to measure synchrotron photons with energies in the keV range. As such a detector can not distinguish between photons and electrons, the main problems are the diffuse cosmic ray gamma background and low energetic electrons in the vicinity of the earth. While the intensity of the diffuse gamma rays is known quite well, there exists limited knowledge about keV-electrons in low earth orbits. To measure these electrons a Prototype Synchrotron Radiation Detector (PSRD) was flown with Space Shuttle mission STS-108 (Dec.2001) and preliminary analysis of the data show very favorable results.

The Prototype Synchrotron Radiation Detector (PSRD)

Abstract The components of the PSRD, a detector to study the flux of X-rays and charged particles in the keV–MeV energy range in outer space, are described. The device is a precursor for the Synchrotron Radiation Detector, which is one of the detector components of the Alpha Magnetic Spectrometer (AMS02). The AMS02 will be operated for several years on the International Space Station.

Study of a novel transition radiation detector utilizing superconducting microspheres for measuring the energy of relativistic high energy charged particles

Abstract In want of a detector capable of measuring accurately the energy of relativistic high energy charged particles, a novel transition radiation detector (TRD) utilizing superheated superconducting microspheres of tin of 22–26 μ m , 27–32 μ m and 32–38 μ m in diameter respectively has been constructed. For the purpose of enhancing the TR effect, the TRD is operated at ∼ 100mK. Test has been conducted in a high energy electron beam facility at the CERN PS in the energy range of 1–10 GeV showing an energy dependence of the TR X-ray photon produced and hence the value γ =E/mc 2 of the charged particle.

Heavy-baryon chiral perturbation theory and reparametrization invariance

We examine the constraints imposed by reparametrization invariance on heavy-baryon chiral perturbation theory (HBChPT). We study the case of three flavors and consider both the strong and weak

Continuous simulation of hypothetical physics processes with multiple free parameters

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