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Your search keyword '"M., Bertaina"' showing total 3 results
Start Over Author "M., Bertaina" Publisher american physical society
3 results on '"M., Bertaina"'

1. First Experimental Characterization of Microwave Emission from Cosmic Ray Air Showers.

Author

Smída R, Werner F, Engel R, Arteaga-Velázquez JC, Bekk K, Bertaina M, Blümer J, Bozdog H, Brancus IM, Chiavassa A, Cossavella F, Di Pierro F, Doll P, Fuchs B, Fuhrmann D, Grupen C, Haungs A, Heck D, Hörandel JR, Huber D, Huege T, Kampert KH, Kang D, Klages H, Kleifges M, Krömer O, Link K, Luczak P, Ludwig M, Mathes HJ, Mathys S, Mayer HJ, Melissas M, Morello C, Neunteufel P, Oehlschläger J, Palmieri N, Pekala J, Pierog T, Rautenberg J, Rebel H, Riegel M, Roth M, Salamida F, Schieler H, Schoo S, Schröder FG, Sima O, Stasielak J, Toma G, Trinchero GC, Unger M, Weber M, Weindl A, Wilczyński H, Will M, Wochele J, and Zabierowski J

Abstract

We report the first direct measurement of the overall characteristics of microwave radio emission from extensive air showers. Using a trigger provided by the KASCADE-Grande air shower array, the signals of the microwave antennas of the Cosmic-Ray Observation via Microwave Emission experiment have been read out and searched for signatures of radio emission by high-energy air showers in the GHz frequency range. Microwave signals have been detected for more than 30 showers with energies above 3×10^{16}  eV. The observations presented in this Letter are consistent with a mainly forward-directed and polarized emission process in the GHz frequency range. The measurements show that microwave radiation offers a new means of studying air showers at E≥10^{17}  eV.

Published
2014
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2. Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande.

Author

Apel WD, Arteaga-Velázquez JC, Bekk K, Bertaina M, Blümer J, Bozdog H, Brancus IM, Buchholz P, Cantoni E, Chiavassa A, Cossavella F, Daumiller K, de Souza V, Di Pierro F, Doll P, Engel R, Engler J, Finger M, Fuhrmann D, Ghia PL, Gils HJ, Glasstetter R, Grupen C, Haungs A, Heck D, Hörandel JR, Huber D, Huege T, Isar PG, Kampert KH, Kang D, Klages HO, Link K, Łuczak P, Ludwig M, Mathes HJ, Mayer HJ, Melissas M, Milke J, Mitrica B, Morello C, Navarra G, Oehlschläger J, Ostapchenko S, Over S, Palmieri N, Petcu M, Pierog T, Rebel H, Roth M, Schieler H, Schröder FG, Sima O, Toma G, Trinchero GC, Ulrich H, Weindl A, Wochele J, Wommer M, and Zabierowski J

Abstract

We report the observation of a steepening in the cosmic ray energy spectrum of heavy primary particles at about 8×10(16) eV. This structure is also seen in the all-particle energy spectrum, but is less significant. Whereas the "knee" of the cosmic ray spectrum at 3-5×10(15) eV was assigned to light primary masses by the KASCADE experiment, the new structure found by the KASCADE-Grande experiment is caused by heavy primaries. The result is obtained by independent measurements of the charged particle and muon components of the secondary particles of extensive air showers in the primary energy range of 10(16) to 10(18) eV. The data are analyzed on a single-event basis taking into account also the correlation of the two observables., (© 2011 American Physical Society)

Published
2011
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3. Antideuteron yield at the AGS and coalescence implications

Author

Armstrong TA, Barish KN, Batsouli S, Bennett SJ, Bertaina M, Chikanian A, Coe SD, Cormier TM, Davies R, Dover CB, Fachini P, Fadem B, Finch LE, George NK, Greene SV, Haridas P, Hill JC, Hirsch AS, Hoversten R, Huang HZ, Jaradat H, Kumar BS, Lainis T, Lajoie JG, Li Q, and Libby B

Abstract

We present Experiment 864's measurement of invariant antideuteron yields in 11.5A GeV/c Au+Pt collisions. The analysis includes 250x10(6) triggers representing 14x10(9) 10% central interactions sampled for events with high mass candidates. We find (1/2pip(t))d(2)N/dydp(t) = 3.5+/-1.5(stat)+0.9-0.5(syst)x10(-8) GeV-2 c(2) for 1.8 = 0.35 GeV/c ( y(c.m.) = 1.6) and 3.7+/-2.7(stat)+1.4-1.5(syst)x10(-8) GeV-2 c(2) for 1.4 = 0.26 GeV/c, and a coalescence parameter B2; of 4.1+/-2. 9(stat)+2.3-2.4(syst)x10(-3) GeV2 c(-3). Implications for coalescence and antimatter annihilation are discussed.

Published
2000
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