| 1. |
- Boezio, Mirko, et al.
(author)
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The electron-hadron separation performance of the PAMELA electromagnetic calorimeter
- 2006
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In: Astroparticle physics. - : Elsevier BV. - 0927-6505 .- 1873-2852. ; 26:2, s. 111-118
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Conference paper (peer-reviewed)abstract
- A silicon-tungsten sampling imaging calorimeter has been designed and built for thePAMELA satellite-borne experiment. The main physics goals of the experiment are themeasurement of the flux of antiprotons (80 MeV-190 GeV) and positrons (50 MeV-270 GeV) in the cosmic radiation. The calorimeter has been designed to identify antiprotons from an electron background and positrons in a background of protons with a high efficiency and rejection power. This work presents the electron-hadron separationcapabilities of the calorimeter as obtained using both Monte Carlo and test beam data.The calorimeter is found to have sufficient performance to reach the primary scientific objectives of PAMELA, providing a proton rejection factor of ∼105 while keeping a ∼90% efficiency in selecting electrons and positrons. From simulations, an electron rejection factor of ∼105 in antiproton measurements (∼90% antiproton identification efficiency) is demonstrated.
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| 2. |
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| 3. |
- Papini, P, et al.
(author)
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High-energy deuteron measurement with the CAPRICE98 experiment
- 2004
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 615:1, s. 259-274
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Journal article (peer-reviewed)abstract
- We report the first measurement of the deuterium abundance in cosmic rays above 10 GeV nucleon(-1) of kinetic energy. The data were collected by the balloon-borne experiment CAPRICE98, which was flown on 1998 May 28-29 from Fort Sumner, New Mexico. The detector configuration included the NMSU-WiZard/CAPRICE superconducting magnet spectrometer equipped with a gas RICH detector, a silicon-tungsten calorimeter, and a time-of-flight system. By combining the information from the spectrometer and the RICH detector, it was possible to separate deuterons from protons in the kinetic energy range from 12 to 22 GeV nucleon(-1). In order to estimate the proton background and the deuteron selection efficiency, we developed an empirical model for the response of the instrument, based on the data collected in this experiment. The analysis procedure is described in this paper, and the result on the absolute flux of deuterium is presented. We found that the deuterium abundance at high energy is consistent with the hypothesis that the propagation mechanism of light nuclei is the same as that of heavier secondary components.
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| 4. |
- Pearce, Mark, et al.
(author)
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CLIMB : cosmic light isotopes and muons with balloons
- 2004
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In: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 525:02-jan, s. 114-117
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Journal article (peer-reviewed)abstract
- A new balloon-borne experiment is proposed which will measure high-energy light isotopes at the top of the Earth's atmosphere and cosmic ray muons at fixed altitudes within the Earth's atmosphere.
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