Search

The SPT collaboration has been investigating the applicability of pixel detectors in the detection of two neutrino double electron capture (2νEC/EC) in 106Cd. The collaboration has proposed a Silicon Pixel Telescope (SPT) where a pair of Si pixel detectors with enriched Cd foil in the middle forms the detection unit. The Pixel detector gives spatial information along with energy of the particle, thus helps to identify and remove the background signals. Four units of SPT prototype (using 0.5 and 1 mm Si sensors) were fabricated and installed in the LSM underground laboratory, France. Recent progress in the SPT experiment and preliminary results from background measurements are presented. [ABSTRACT FROM AUTHOR]

The TGV collaboration has been investigating two neutrino double electron capture (2?EC/EC) in 106Cd since 2000. The double beta experiments would answer some of the puzzling problems about neutrinos (eg. nature and mass) but one of the main challenges is the background events. The collaboration is investigating the use of pixel detectors in such rare decay experiments. Pixel detector gives spatial information along with energy of the particle, thus provides useful information to reduce the background. The collaboration has proposed a Silicon Pixel Telescope (SPT) for the next generation experiment; where a pair of Si pixel detectors with enriched Cd foil in the middle forms the detection unit. A prototype unit of SPT has been constructed and results of preliminary background measurements performed on the surface and in the underground laboratories are presented. [ABSTRACT FROM AUTHOR]

The characteristics of a Full-Field X-ray Fluorescence (FF-XRF) set-up for element-specific imaging, installed at the HASYLAB synchrotron radiation source, were determined. A lateral resolution of 10 μm and limits of detection in the percentage range were found. Further potential developments in CCDs available for FF-XRF are discussed and the use of polycapillary lenses as image transfer optics is illustrated in some explorative experiments. [ABSTRACT FROM AUTHOR]

Single quantum counting pixel detectors of Medipix type are starting to be used in various radiographic applications. Compared to standard devices for digital imaging (such as CCDs or CMOS sensors) they present significant advantages: direct conversion of radiation to electric signal, energy sensitivity, noiseless image integration, unlimited dynamic range, absolute linearity. In this article we describe usage of the pixel device TimePix for image accumulation gated by late trigger signal. Demonstration of the technique is given on imaging coincidence instrumental neutron activation analysis (Imaging CINAA). This method allows one to determine concentration and distribution of certain preselected element in an inspected sample. [ABSTRACT FROM AUTHOR]

High resolution radiography (with X-rays, neutrons, heavy charged particles, ...) often exploited also in tomographic mode to provide 3D images stands as a powerful imaging technique for instant and nondestructive visualization of fine internal structure of objects. Novel types of semiconductor single particle counting pixel detectors offer many advantages for radiation imaging: high detection efficiency, energy discrimination or direct energy measurement, noiseless digital integration (counting), high frame rate and virtually unlimited dynamic range. This article shows the application and potential of pixel detectors (such as Medipix2 or TimePix) in different fields of radiation imaging. [ABSTRACT FROM AUTHOR]

The Compressed Baryonic Matter (CBM) experiment at GSI’s future international Facility for Antiproton and Ion Research (FAIR) will study strongly interacting matter at high baryon densities. The central component of the fixed-target heavy-ion spectrometer is a high-performance silicon vertex tracker. It applies most advanced pixel and microstrip detectors to track exclusively the charged particles created in the collisions and to reconstruct decay vertices from “open charm”. The development of the silicon tracker is challenging and includes R&D on ultra low-mass sensors and support structures, extreme radiation hardness, and fast self-triggered readout. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

The ALICE Silicon Pixel Detector (SPD) is constituted by two barrel layers with ≈107 hybrid pixel cells. The basic detector element is the Half-Stave (HS), an array of two ladders, each composed of 5 pixel chips bump bonded to a Si sensor matrix. The ladders are mounted on a low-mass aluminum/polyimide multilayer bus for power distribution and signal routing. The assembly procedures of the half-staves and their mounting on the carbon fiber support sectors, implemented on high precision measuring tables, with computerized controllers for positioning and gluing, are described, and the present status of construction is overviewed. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]