Results 1 - 10 of 2559
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[en] We present a method of measuring the elliptic flow (v2) of nonphotonic electrons from heavy flavor quark decays using the STAR detector at RHIC in Au + Au collisions at √SNN. Inclusive electrons are identified in the pT range 0.5-4 GeV/c at mid-rapidity -1 < η < 0 by the STAR time projection chamber (TPC) and time-of-flight detector. Photonic e+e- pairs with characteristic low invariant mass are reconstructed in the TPC and their v2 is measured using the standard event plane method by subtracting the combinatorial background in the dN/dΔφ distributions in each pT bin. The nonphotonic electron v2 and its propagated error can be derived from the inclusive and photonic electron v2. We estimate the necessary statistics and errors of nonphotonic electron v2 for a more recent RHIC run.
[en] The three time projection chambers of the T2K near detector are micro pattern gaseous detectors based on bulk micromegas technology. They have been operated successfully during the first two physics runs of the experiment. Their design, operation, and performance are presented.
[en] Two proton radioactivity has been observed experimentally in the decay of "4"5Fe and "5"4Zn, and possibly of "4"8Ni. These first experiments only allowed for a limited comparison with theory: T_1_/_2 and Q_2_P values. Experimental efforts have been achieved to measure dynamical observables in order to perform a more detailed study of the decay mechanism. Time projection chambers have been developed by groups of Bordeaux and Warsaw, and were successfully used at GANIL and MSU: those devices allowed for a first direct observation of the individual protons in the 2-proton radioactivity of "4"5Fe, and a first estimate of correlations of these protons. (author)
[en] An eight chip InGrid module has been tested as readout of a prototype time projection chamber. The construction of the modules as well as first preliminary results are presented. The InGrids, a Micromegas like amplification structure with a pixel ASIC, have been produced on wafer-level in a photolithographic process. For the measurements a newly developed readout system based on the Scalable Readout System was used
[en] In their 'Comments on 'The HARP detector at the CERN PS' ' V. Ammosov et al. criticize the description of the calibration and performance of two detectors of the HARP apparatus, namely the TPC and the RPC system. This Rebuttal intends to answer all points raised with experimental evidence. This Rebuttal is not concerned with the claims of the performances possibly obtained by the commenters
[en] An optical scanning system was commissioned and further developed in the Detector Laboratory of Helsinki Institute of Physics and University of Helsinki. It was designed to automatically scan, perform on-line analysis and to classify the overall quality of GEM-foils especially of the GEM-TPC detectors for Super-FRS at FAIR. The optical scanning system consists of precision positioning table, lighting, optics and operating system with analysis software. It has active scanning area of 95 cm × 95 cm and it can study this area with a resolution of 1441 p/mm. In this paper the performance of the system is studied on different measurement tasks.
[en] A 10 kilo-tonne dual-phase liquid argon TPC is one of the detector options considered for the Deep Underground Neutrino Experiment (DUNE). The detector technology relies on amplification of the ionisation charge in ultra-pure argon vapour and offers several advantages compared to the traditional single-phase liquid argon TPCs. A 4.2 tonne dual-phase liquid argon TPC prototype, the largest of its kind, with an active volume of \three has been constructed and operated at CERN. In this paper we describe in detail the experimental setup and detector components as well as report on the operation experience. We also present the first results on the achieved charge amplification, prompt scintillation and electroluminescence detection, and purity of the liquid argon from analyses of a collected sample of cosmic ray muons.