D. Saltzberg
A5081037967- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Laser Design and Applications
- Spectroscopy and Laser Applications
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Solid State Laser Technologies
- Atomic and Subatomic Physics Research
- Cryospheric studies and observations
- Black Holes and Theoretical Physics
- Gamma-ray bursts and supernovae
- Distributed and Parallel Computing Systems
- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Radiation Therapy and Dosimetry
University of California, Los Angeles
2016-2025
University of California System
2007-2025
UCLA Health
2001-2024
Institute of High Energy Physics
2016-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
University of California, Davis
2018-2023
Greater Baltimore Medical Center
2022
University of Illinois Chicago
2022
University of Iowa
2022
We present the first direct experimental evidence for charge excess in high-energy particle showers and corresponding radio emission predicted nearly 40 years ago by Askaryan. directed picosecond pulses of GeV bremsstrahlung photons at SLAC Final Focus Test Beam into a 3.5 ton silica sand target, producing electromagnetic several meters long. A series antennas spanning 0.3 to 6 GHz detected strong, subnanosecond radio-frequency produced showers. Measurements polarization, coherence, timing,...
We report results from 120 hours of livetime with the Goldstone Lunar Ultra-high energy neutrino Experiment (GLUE). The experiment searches for <10 ns microwave pulses lunar regolith, appearing in coincidence at two large radio telescopes separated by 22 km and linked optical fiber. Such would arise subsurface electromagnetic cascades induced interactions >= 100 EeV neutrinos regolith. No candidates are yet seen, implied limits constrain several current models ultra-high fluxes.
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 the Askaryan charge excess ultra-high energy neutrino-induced cascades within ice. This included significant improvements first payload sensitivity, efficiency, and a trajectory deeper Analysis of in-flight calibration pulses surface...
We report new limits on cosmic neutrino fluxes from the test flight of Antarctic Impulsive Transient Antenna (ANITA) experiment, which completed an 18.4 day a prototype long-duration balloon payload, called ANITA-lite, in early 2004. search for impulsive events that could be associated with ultrahigh energy interactions ice and derive constrain several models rule out long-standing -burst model.
We report on observations of coherent, impulsive radio Cherenkov radiation from electromagnetic showers in solid ice. This is the first observation Askaryan effect As part complete validation process for ANITA experiment, we performed an experiment at Stanford Linear Accelerator Center June 2006 using a 7.5 metric ton ice target. measure time large-scale angular dependence pattern, major factor determining solid-angle acceptance ultrahigh-energy neutrino detectors.
We report the observation of 16 cosmic ray events with a mean energy $1.5\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{eV}$ via radio pulses originating from interaction air shower Antarctic geomagnetic field, process known as geosynchrotron emission. present measurements in 300--900 MHz range, which are first self-triggered, ultrawide band, far-field, and highest sample collected technique. Their properties inconsistent current ground-based models. The emission is 100%...
We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of were previously identified as stratospheric CR air showers during ANITA-I flight. A third was detected ANITA-II Here we characteristics these three unusual events, which develop nearly horizontally, 20-30~km above surface Earth. In addition, fourth steeply upward-pointing radio event has consistent primary...
We report on an upward traveling, radio-detected cosmic-ray-like impulsive event with characteristics closely matching extensive air shower. This event, observed in the third flight of Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload, is consistent similar reported previous flight. These events could be produced by atmospheric decay upward-propagating τ lepton ν_{τ} interaction, although their relatively steep arrival angles create tension...
The ANtarctic Impulsive Transient Antenna (ANITA) NASA long-duration balloon payload completed its fourth flight in December 2016, after 28 days of time. ANITA is sensitive to impulsive broadband radio emission from interactions ultrahigh-energy neutrinos polar ice (Askaryan emission). We present the results two separate blind analyses searching for signals Askaryan data ANITA. more analysis, with a better expected limit, has background estimate ${0.64}_{\ensuremath{-}0.45}^{+0.69}$ and an...
We report initial results of the first flight Antarctic Impulsive Transient Antenna (ANITA-1) 2006-2007 Long Duration Balloon flight, which searched for evidence a diffuse flux cosmic neutrinos above energies E(nu) approximately 3 x 10(18) eV. ANITA-1 flew 35 days looking radio impulses due to Askaryan effect in neutrino-induced electromagnetic showers within ice sheets. here on our analysis, was performed as blind search data. No neutrino candidates are seen, with no detected physics...
The Antarctic Impulsive Transient Antenna (ANITA), a NASA long-duration balloon payload, searches for radio emission from interactions of ultra-high-energy neutrinos in polar ice. third flight ANITA (ANITA-III) was launched December 2014 and completed 22-day flight. We present the results three analyses searching Askaryan neutrino origin. In most sensitive analyses, we find one event signal region on an expected priori background $0.7^{+0.5}_{-0.3}$. Though consistent with estimate,...
Abstract We have determined the in situ electric field attenuation length L α (defined as over which signal amplitude diminishes by a factor 1/ e ) for radio-frequency signals broadcast vertically through South Polar ice and reflected off underlying bed. Conservatively assuming bedrock reflectivity f = 380 MHz, T –50°C; errors incorporate uncertainties R . This value is consistent with previous estimates that radiofrequency exceeds at optical frequencies an order of magnitude.
We report on further SLAC measurements of the Askaryan effect: coherent radio emission from charge asymmetry in electromagnetic cascades. used synthetic rock salt as dielectric medium, with cascades produced by GeV bremsstrahlung photons at Final Focus Test Beam. extend our prior discovery to a wider range parameter space and explore effect medium great potential interest large-scale ultra-high-energy neutrino detectors: (halite), which occurs naturally high purity formations containing many...
Recently, the ANITA collaboration reported on two upward-going extensive air shower events consistent with a primary particle that emerges from surface of ice. These may be $\nu_\tau$ origin, in which neutrino interacts within Earth to produce $\tau$ lepton Earth, decays atmosphere, and initiates an shower. In this paper we estimate upper bound acceptance diffuse flux detected via $\tau$-lepton-induced showers bounds Standard Model (SM) uncertainties. By comparing Pierre Auger Observatory...
We present an analysis of the discovery reach for supersymmetric particles at upgraded Tevatron collider, assuming that SUSY breaking results in universal soft parameters grand unification scale, and lightest particle is stable neutral. first a review literature, including issues unification, renormalization group evolution supersymmetry effect radiative corrections on effective low energy couplings masses theory. consider experimental bounds coming from direct searches those arising...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation W. K. Bischel, G. Black; Wavelength dependence of raman scattering cross sections from 200‐600 nm. AIP Conf. Proc. 10 July 1983; 100 (1): 181–187. https://doi.org/10.1063/1.34046 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search...
For fifty years, cosmic-ray air showers have been detected by their radio emission. We present the first laboratory measurements that validate electrodynamics simulations used in shower modeling. An experiment at SLAC provides a beam test of radio-frequency (RF) radiation from charged particle cascades presence magnetic field, model system shower. This suite controlled to compare particle-level RF emission, which are relied upon ultra-high-energy detection. data for intensity, linearity with...
Abstract We report an in situ measurement of the electric field attenuation length L α at radio frequencies for bulk ice Summit Station, Greenland, made by broadcasting radio-frequency signals vertically through and measuring relative power return ground bounce signal. find depth-averaged to be 75 MHz. While this has clear radioglaciological applications, clarity also implications detection ultra-high energy (UHE) astrophysical particles via their emission dielectric media such as ice....
We present measurements of radio transmission in the $\ensuremath{\sim}100\text{ }\text{ }\mathrm{MHz}$ range through a }\mathrm{m}$ deep region below surface ice at Summit Station, Greenland, called firn. In firn, index refraction changes due to transition from snow glacial below, affecting propagation signals that region. compare our observations finite-difference time-domain (FDTD) electromagnetic wave simulation, which supports existence three classes propagation: bulk ray-bending mode...