A detector based on a pixellated scintillator crystal coupled on two opposite sides to Silicon Photomultiplier (SiPM) strips is presented. In one direction the width of the SiPM strips matches the crystal pitch, while in the other direction the strip length is equal to the crystal pitch times the number of pixels in a row. The SiPM strips on one side are orthogonal to the strips on the other side. The crystal position can be identified using a row-column

A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8×10^6 positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to aprox.250GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows

Following the decision to maintain the International Space Station(ISS)on orbit until at least 2020 (possibly until 2028)the AMS collaboration decided to correspondingly extend the life time of the experiment. Since the limited amount of helium used to cool the superconducting magnet allowed for only a limited run time of the experiment,a change from the superconducting magnet to the permanent magnet used in AMS-01 became necessary. Due to the lower

STS-134 launch has been shifted again to a new “no earlier than” date: May 16th at 8:56 a.m. EDT. The AMS particle detector will take off on 29 April 2011 at 21.47 CEST onboard the very last mission of the space Shuttle Endeavour. AMS, the Alpha Magnetic Spectrometer, will then be installed on the International Space Station from where it will explore the Universe for a period of over 10 years. AMS will address some of the most exciting mysteries

In this paper we propose a new scanner for small animal positron emission tomography (PET) based on stacks of double sided silicon detectors. Each stack is composed of 40 planar detectors with dimension 60mmx60mmx1mm and 128 orthogonal strips on both sides to read the two coordinates of interaction, the third being the detector number in the stack. Multiple interactions in a stack are discarded. In this way we achieve a precise determination of the

Measurement of the chemical and isotopic composition of cosmic rays is essential for the precise understanding of their propagation in the galaxy. While the model parameters are mainly determined using the B/C ratio, the study of extended sets of ratios can provide stronger constraints on the propagation models. In this paper, the relative abundances of light-nuclei lithium, beryllium, boron, and carbon are presented. The secondary-to-primary ratios

The INFN Fellowship Programme 2010/2011 offers 35 (thirtyfive) positions for non Italian citizens for research activity in theoretical (n. 15) or experimental physics (n. 20). Fellowships are intended for young post-graduates who are under 35 years of age by November 15, 2010. Each fellowship, initially, is granted for one year and then, may be extended for a second year. http://www.ac.infn.it/personale/borsedistudio/pdf/getfile.php?filename=id751.pdf

In time-of-fight measurements, or positron emission tomography experiments where two gamma rays are detected in coincidence, the time resolution of the photodetector is of primary importance. SiPMs are very promising devices for these applications, since their intrinsic response time can be less than 1 ns. However the actual timing resolution of SiPM is affected by the area (capacitance) of the device, by the type of used to pre-amplify the signal,

The University of Padova, through the funding of the Fondazione Cassa di Risparmio di Padova e Rovigo, offers research fellowships for foreign students to attend Doctoral Schools/International Courses. http://www.unipd.it/en/doctorates/grants.htm

We have proposed a new scanner for small-animal positron emission tomography (PET) based on stacks of double sided silicon detectors. Each stack is composed of 40 planar detectors with dimension 60 times 60 times 1 mm3 and 128 orthogonal strips on both sides to read the two coordinates of interaction, the third being the detector number in the stack. Multiple interactions in a stack may be discarded. In this way we achieve a precise determination