467 citations · 1.8k across the 15 of their papers we have counts for
15 papers
The boron-to-carbon abundance ratio and Galactic propagation of cosmic radiation
A. Obermeier, P. Boyle, J. Hörandel +1
In two long-duration balloon flights in 2003 and 2006, the TRACER cosmic-ray detector has measured the energy spectra and the absolute intensities of the cosmic-ray nuclei from bor…
Energy spectra of primary and secondary cosmic-ray nuclei measured with TRACER
A. Obermeier, M. Ave, P. Boyle +3
The TRACER cosmic-ray detector, first flown on long-duration balloon (LDB) in 2003 for observations of the major primary cosmic-ray nuclei from oxygen (Z=8) to iron (Z=26), has bee…
Propagation and Source Energy Spectra of Cosmic-Ray Nuclei at High Energies
M. Ave, P. J. Boyle, C. Hoeppner +2
This paper has not yet been accepted for publication
Composition of Primary Cosmic-Ray Nuclei at High Energies
M. Ave, P. J. Boyle, F. Gahbauer +5
The TRACER instrument (``Transition Radiation Array for Cosmic Energetic Radiation'') has been developed for direct measurements of the heavier primary cosmic-ray nuclei at high en…
Spectrum of Very High Energy Gamma-Rays from the blazar 1ES1959+650 during Flaring Activity in 2002
M. K. Daniel
The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cherenkov Telescope during May of 2002. A spectral analysis has been carried out o…
Detection of TeV Gamma Rays from the BL Lac Object 1ES1959+650 with the Whipple 10m Telescope
J. Holder, VERITAS collaboration
We present the first strong detection of very high energy gamma-rays from the close (z=0.048) X-ray selected BL Lacertae object 1ES1959+650. Observations were made with the Whipple…
The TeV spectrum of H1426+428
D. Petry, I. H. Bond, S. M. Bradbury +45
The BL Lac object H1426+428 was recently detected as a high energy gamma-ray source by the VERITAS collaboration (Horan et al. 2002). We have reanalyzed the 2001 portion of the dat…
Discovery of Spectral Variability of Markarian 421 at TeV Energies
F. Krennrich, I. H. Bond, S. M. Bradbury +38
The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10m gamma-ray telescope taken in 2000/2…
Measurement of the Cosmic-Ray Antiproton to Proton Abundance Ratio between 4 and 50 GeV
A. S. Beach, J. J. Beatty, A. Bhattacharyya +13
We present a new measurement of the antiproton to proton abundance ratio, pbar/p, in the cosmic radiation. The HEAT-pbar instrument, a balloon borne magnet spectrometer with precis…
VERITAS: the Very Energetic Radiation Imaging Telescope Array System
T. C. Weekes
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) represents an important step forward in the study of extreme astrophysical processes in the universe. It combi…
Cutoff in the TeV Energy Spectrum of Markarian 421 During Strong Flares in 2001
F. Krennrich, H. M. Badran, I. H. Bond +43
Exceptionally strong and long lasting flaring activity of the blazar Markarian 421 (Mrk 421) occurred between January and March 2001. Based on the excellent signal-to-noise ratio o…
Energy Spectra, Altitude Profiles and Charge Ratios of Atmospheric Muons
S. Coutu, J. J. Beatty, M. A. DuVernois +15
We present a new measurement of air shower muons made during atmospheric ascent of the High Energy Antimatter Telescope balloon experiment. The muon charge ratio mu+ / mu- is prese…
Cosmic-Ray Positrons: Are There Primary Sources?
Stephane Coutu, Steven W. Barwick, James J. Beatty +15
Cosmic rays at the Earth include a secondary component originating in collisions of primary particles with the diffuse interstellar gas. The secondary cosmic rays are relatively ra…
The Energy Spectra and Relative Abundances of Electrons and Positrons in the Galactic Cosmic Radiation
S. W. Barwick, J. J. Beatty, C. R. Bower +17
Observations of cosmic-ray electrons and positrons have been made with a new balloon-borne detector, HEAT (the "High-Energy Antimatter Telescope"), first flown in 1994 May from For…
Measurements of the Cosmic-Ray Positron Fraction From 1 to 50 GeV
HEAT Collaboration, S. W. Barwick, E. Schneider +16
Two measurements of the cosmic-ray positron fraction as a function of energy have been made using the High Energy Antimatter Telescope (HEAT) balloon-borne instrument. The first fl…