We report new results for the cosmic-ray antiproton-to-proton ratio from 3 to 50 GeV at the top of the atmosphere. These results represent the first measurements, on an event-by-event basis, of mass-resolved antiprotons above 18 GeV. The results were obtained with the NMSU-WIZARD/CAPRICE98 balloon-borne magnet spectrometer equipped with a gas-RICH (Ring-Imaging Cerenkov) counter and a silicon-tungsten imaging calorimeter. The RICH detector was the first ever flown that is capable of identifying charge-one particles at energies above 5 GeV. The spectrometer was flown on 1998 May 28-29 from Fort Sumner, New Mexico. The measured (p) over bar/p ratio is in agreement with a pure secondary interstellar production.
|Titolo:||First mass-resolved measurement of high-energy cosmic-ray antiprotons|
|Data di pubblicazione:||2000|
|Citazione:||First mass-resolved measurement of high-energy cosmic-ray antiprotons / Vacchi, Andrea. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 534:2(2000), pp. L177-L180.|
|Appare nelle tipologie:||1.1 Articolo in rivista|