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Type: Journal article
Title: Limit on the ultrahigh-energy neutrino flux from lunar observations with the Parkes radio telescope
Author: Bray, J.
Ekers, R.
Roberts, P.
Reynolds, J.
James, C.
Phillips, C.
Protheroe, R.
McFadden, R.
Aartsen, M.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2015; 91(6):063002-1-063002-10
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-7998
Statement of
J.D. Bray, R.D. Ekers, P. Roberts, J.E. Reynolds, C.W. James, C.J. Phillips, R.J. Protheroe, R.A. McFadden, and M.G. Aartsen
Abstract: We report a limit on the ultrahigh-energy neutrino flux based on a nondetection of radio pulses from neutrino-initiated particle cascades in the Moon, in observations with the Parkes radio telescope undertaken as part of the LUNASKA project. Because of the improved sensitivity of these observations, which had an effective duration of 127 hours and a frequency range of 1.2–1.5 GHz, this limit extends to lower neutrino energies than those from previous lunar radio experiments, with a detection threshold below 1020 eV. The calculation of our limit allows for the possibility of lunar-origin pulses being misidentified as local radio interference, and includes the effect of small-scale lunar surface roughness. The targeting strategy of the observations also allows us to place a directional limit on the neutrino flux from the nearby radio galaxy Centaurus A.
Rights: © 2015 American Physical Society
DOI: 10.1103/PhysRevD.91.063002
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