Abstract
All known small solar system bodies have diameters between a few meters and a few thousands of kilometers. Based on the collisional evolution of solar system bodies, a larger number of ...asteroids with diameters down to ∼2 m is thought to exist. As all solar system bodies, small bodies can be passive sources of high-energy gamma-rays, produced by the interaction of energetic cosmic rays impinging on their surfaces. Since the majority of known asteroids are in orbits between Mars and Jupiter (in a region known as the Main Belt), we expect them to produce a diffuse emission close to the ecliptic plane. In this work, we have studied the gamma-ray emission coming from the ecliptic using the data collected by the Large Area Telescope (LAT) onboard the Fermi satellite. We have fit the results with simulations of the gamma-ray intensity at the source level (calculated with the software
FLUKA
) to constrain the small solar system bodies population. Finally, we have proposed a model describing the distribution of asteroid sizes and we have used the LAT data to constrain the gamma-ray emission expected from this model and, in turn, on the model itself.
A light tracker based on scintillating fibers with SiPM readout Mazziotta, M.N.; Altomare, C.; Bissaldi, E. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2022, Letnik:
1039
Journal Article
Recenzirano
We have developed a novel light tracker based on plastic scintillating fiber arrays readout with Silicon Photomultipliers (SiPMs). The tracker consists of multiple planes, with the fibers in each ...plane oriented perpendicularly to those in the adjacent plane, in order to allow 3D track reconstruction. The fibers in each plane have round cross sections, with a diameter of 500μm, and are arranged in two staggered layers in a close-packed configuration. The fibers are readout by means of SiPM arrays with a 250μm strip pitch placed at one of their ends. Scintillating fibers allow a reduced material budget while providing a good spatial resolution and a fast response. This design is therefore suitable to track low-energy particles, such as the lowest energy cosmic rays or the electrons produced in Compton scatterings of gamma rays with energies down to 100 keV. We have built a detector prototype, equipped with Hamamatsu 128-channel SiPM arrays, readout with 32-channel PETIROC2A front-end ASICs. These ASICs are controlled by a custom data acquisition system board equipped with Xilinx Kintex-7 FPGA with self-triggering capabilities. The prototype has been tested with particle beams, cosmic rays and radioactive sources. The tracker design will be presented and performance of the prototype will be discussed.
A compact, light scintillating fiber tracker with SiPM readout Pillera, R.; Altomare, C.; Bissaldi, E. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
March 2023, 2023-03-00, Letnik:
1048
Journal Article
Recenzirano
We present the concept of a novel compact and light tracker based on arrays of plastic scintillating fibers readout with Silicon Photomultipliers (SiPMs). The tracker will be composed of multiple ...planes, with the fibers in each plane oriented perpendicularly to those in the adjacent planes. Each plane will consist of two staggered layers of fibers, having a round cross section with 500 μm diameter and arranged in a close packed configuration. Scintillation photons produced in the fibers will be collected by SiPM arrays with 250 μm strip pitch located at one end of the fibers. This configuration will ensure an accurate spatial resolution and a fast response, while keeping a reduced material budget. Hence, this detector will be suitable to track low energy particles and will be able to efficiently detect the Compton scattered electrons produced by gamma rays with energies down to 100 keV. We built a reduced scale tracker prototype, using Hamamatsu 128 channel SiPM arrays and 32 channel PETIROC2A front end ASICs readout. The latter are controlled by a custom data acquisition board with self triggering capabilities. We tested this prototype with cosmic rays, radioactive sources and accelerated particle beams.
Satellite experiments employ plastic scintillators to discriminate charged from neutral particles and to identify charged nuclei. We have assembled and tested a prototype of Plastic Scintillator ...Detector (PSD) equipped with Silicon Photomultipliers (SiPMs) for the High Energy Cosmic Radiation Detection facility (HERD) that will be installed onboard the future Chinese Space Station (CSS). The HERD experiment will provide high quality data on charged cosmic rays up to PeV energies and gamma rays above 100 MeV energies. In order to explore the capability of charge identification of nuclei up to iron, a beam test campaign was performed in 2022 at CERN to study the overall performance of the PSD. The PSD prototype is composed of 8 plastic scintillator trapezoidal bars of two different lengths. The PSD prototype was irradiated with an ion beam composed of particles of selected momentum of 150 GeV/n at CERN SPS H8 beam line. Along the beam line two 10× 10× 0.5 cm 3 squared plastic scintillator tiles were also placed to monitor the beam composition and the particle fragmentation upstream and downstream the beam line. In this work the main results of the SPS H8 beam test in terms of nuclei identification performances of the PSD ptototype detector will be shown.
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