anita-web-admin 
This is an erratum to our paper in Physical Review D82:022004,2010, corresponding to preprint: arXiv:1003.2961. arxiv.org
Ultrahigh-energy cosmic rays (UHECRs), with energies exceeding 10^19eV, are rare. A random square kilometer on Earth is hit by a few dozen per century. But their trajectories, relatively undeflected by intergalactic magnetic fields, might reveal their enigmatic sources. So astrophysicists build enormous ground-detector arrays. But even the flagship 3000-km^2 Pierre Auger Observatory in Argentina, which … Read more →
Observation of Ultra-high-energy Cosmic Rays with the ANITA Balloon-borne Radio Interferometer Locations of direct (black) and reflected (red) detection of ultrahigh energy cosmic ray events by the ANITA balloon experiment over Antarctica. The field of view is delineated by the dashed blue line. [S. Hoover et al., Phys. Rev. Lett. 105, 151101 (2010)] Physical Review … Read more →
We have conducted a search for extended energy deposition trails left by ultra-relativistic magnetic monopoles interacting in Antarctic ice. The non-observation of any satisfactory candidates in the 31 days of accumulated ANITA-II flight data results in an upper limit on the diffuse flux of relativistic monopoles. We obtain a 90% C.L. limit of order 10^{-19}/(cm^2-s-sr) … Read more →
The Antarctic Impulsive Transient Antenna (ANITA) completed its second long-duration balloon flight in January 2009, with 31 days aloft (28.5 live days) over Antarctica. ANITA searches for impulsive coherent radio Cherenkov emission from 200 to 1200 MHz, arising from the Askaryan charge excess in ultra-high energy neutrino-induced cascades within Antarctic ice. This flight included significant … Read more →
We report the observation of sixteen cosmic ray events of mean energy of 1.5 × 10^19 eV, via radio pulses originating from the interaction of the cosmic ray air shower with the Antarctic geomagnetic field, a process known as geosynchrotron emission. We present the first ultra-wideband, far-field measurements of the radio spectral density of geosynchrotron … Read more →
Ultrahigh energy photons striking matter can transform into rho mesons through an interaction that involves many nuclei simultaneously, a phenomenon that may affect the detection signatures of high-energy particles from space. When an energetic photon smashes into matter, it can create a massive particle, the rho meson, when it strikes an atomic nucleus. A report … Read more →
We report initial results of the first flight of the Antarctic Impulsive Transient Antenna (ANITA-1) 2006- 2007 Long Duration Balloon flight, which searched for evidence of a diffuse flux of cosmic neutrinos above energies of E_v ~= 3×10^18 eV. ANITA-1 flew for 35 days looking for radio impulses due to the Askaryan effect in neutrino-induced … Read more →
We present a detailed report on the experimental details of the Antarctic Impulsive Transient Antenna (ANITA) long duration balloon payload, including the design philosophy and realization, physics simulations, performance of the instrument during its first Antarctic flight completed in January of 2007, and expectations for the limiting neutrino detection sensitivity. Neutrino physics results will be … Read more →
November 3-25, 2008 The initial ANITA team arrived the first week of November, and the gondola build was in full swing led by Dana Braun, Brian Hill and Christian Miki by the 2nd week. The major structure of the gondola was all put together by Nov. 12 or so, but lots of details kept the … Read more →