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Title: Accelerator measurements of the Askaryan effect in rock salt: A roadmap toward teraton underground neutrino detectors

Abstract

Here, we report on further SLAC measurements of the Askaryan effect: coherent radio emission from charge asymmetry in electromagnetic cascades. We used synthetic rock salt as the dielectric medium, with cascades produced by GeV bremsstrahlung photons at the Final Focus Test Beam. We extend our prior discovery measurements to a wider range of parameter space and explore the effect in a dielectric medium of great potential interest to large-scale ultra-high-energy neutrino detectors: rock salt (halite), which occurs naturally in high purity formations containing in many cases hundreds of km 3 of water-equivalent mass. We observed strong coherent pulsed radio emission over a frequency band from 0.2–15 GHz. A grid of embedded dual-polarization antennas was used to confirm the high degree of linear polarization and track the change of direction of the electric-field vector with azimuth around the shower. Coherence was observed over 4 orders of magnitude of shower energy. The frequency dependence of the radiation was tested over 2 orders of magnitude of UHF and microwave frequencies. We have also made the first observations of coherent transition radiation from the Askaryan charge excess, and the result agrees well with theoretical predictions. Based on these results we have performed a detailedmore » and conservative simulation of a realistic GZK neutrino telescope array within a salt dome, and we find it capable of detecting 10 or more contained events per year from even the most conservative GZK neutrino models.« less

Authors:
 [1];  [2];  [3];  [1];  [1];  [1];  [3];  [4]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Stanford Univ., Stanford, CA (United States)
  4. Univ. of California, Los Angeles, CA (United States); Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1442457
Report Number(s):
SLAC-PUB-10911
Journal ID: ISSN 1550-7998; PRVDAQ; TRN: US1900924
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 72; Journal Issue: 2; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Gorham, P. W., Saltzberg, D., Field, R. C., Guillian, E., Milinčić, R., Miočinović, P., Walz, D., and Williams, D. Accelerator measurements of the Askaryan effect in rock salt: A roadmap toward teraton underground neutrino detectors. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.023002.
Gorham, P. W., Saltzberg, D., Field, R. C., Guillian, E., Milinčić, R., Miočinović, P., Walz, D., & Williams, D. Accelerator measurements of the Askaryan effect in rock salt: A roadmap toward teraton underground neutrino detectors. United States. doi:10.1103/PhysRevD.72.023002.
Gorham, P. W., Saltzberg, D., Field, R. C., Guillian, E., Milinčić, R., Miočinović, P., Walz, D., and Williams, D. Thu . "Accelerator measurements of the Askaryan effect in rock salt: A roadmap toward teraton underground neutrino detectors". United States. doi:10.1103/PhysRevD.72.023002. https://www.osti.gov/servlets/purl/1442457.
@article{osti_1442457,
title = {Accelerator measurements of the Askaryan effect in rock salt: A roadmap toward teraton underground neutrino detectors},
author = {Gorham, P. W. and Saltzberg, D. and Field, R. C. and Guillian, E. and Milinčić, R. and Miočinović, P. and Walz, D. and Williams, D.},
abstractNote = {Here, we report on further SLAC measurements of the Askaryan effect: coherent radio emission from charge asymmetry in electromagnetic cascades. We used synthetic rock salt as the dielectric medium, with cascades produced by GeV bremsstrahlung photons at the Final Focus Test Beam. We extend our prior discovery measurements to a wider range of parameter space and explore the effect in a dielectric medium of great potential interest to large-scale ultra-high-energy neutrino detectors: rock salt (halite), which occurs naturally in high purity formations containing in many cases hundreds of km3 of water-equivalent mass. We observed strong coherent pulsed radio emission over a frequency band from 0.2–15 GHz. A grid of embedded dual-polarization antennas was used to confirm the high degree of linear polarization and track the change of direction of the electric-field vector with azimuth around the shower. Coherence was observed over 4 orders of magnitude of shower energy. The frequency dependence of the radiation was tested over 2 orders of magnitude of UHF and microwave frequencies. We have also made the first observations of coherent transition radiation from the Askaryan charge excess, and the result agrees well with theoretical predictions. Based on these results we have performed a detailed and conservative simulation of a realistic GZK neutrino telescope array within a salt dome, and we find it capable of detecting 10 or more contained events per year from even the most conservative GZK neutrino models.},
doi = {10.1103/PhysRevD.72.023002},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 2,
volume = 72,
place = {United States},
year = {2005},
month = {7}
}

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