Bulletin of the American Physical Society
Mid-Atlantic Section Meeting 2021
Volume 66, Number 18
Friday–Sunday, December 3–5, 2021; Rutgers University, New Brunswick, New Jersey
Session D03: Astrophysics III |
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Chair: John Hughes, Rutgers University Room: 202A |
Saturday, December 4, 2021 11:15AM - 11:51AM |
D03.00001: Neutrino Astronomy with IceCube Invited Speaker: Naoko Kurahashi Neilson Neutrinos are one of the main pillars of multi-messenger astronomy. With numerous developments and new results in neutrino astronomy in the last 5 years, it's hard to know where we stand and where the data is leading us. In this talk, I will review the basics of neutrino astronomy, the IceCube Neutrino Observatory, the main finding of the last 5 years, and attempt to foresee where we are headed in the next 5 years. [Preview Abstract] |
Saturday, December 4, 2021 11:51AM - 12:27PM |
D03.00002: Recent Results from the Pierre Auger Observatory Invited Speaker: Alan Coleman The Pierre Auger Observatory is the world's largest cosmic ray detector and covers around 3000 km$^2$ in the Mendoza Province of Argentina. After having collected data for more than 17 years, with a combined exposure above $10^5$ km$^2$ sr yr, we have been able to make measurements of cosmic rays which have implications in our understanding of astrophysical processes both inside and outside of our galaxy as well as in our understanding of particle physics. In this presentation, I will discuss the recent physics results by the Collaboration, focusing on the paradigm that seems most consistent with our measurements. I will also discuss the future of the Observatory enabled by the additional hardware as part of Auger Prime. [Preview Abstract] |
Saturday, December 4, 2021 12:27PM - 12:39PM |
D03.00003: Analyzing the Radio Wavefront of Cosmic Ray Air Showers at the South Pole using CoREAS Simulations Benjamin Flaggs, Alan Coleman, Frank Schroeder Air showers, initiated by high energy cosmic rays interacting with atmospheric nuclei, generate radio emission which can be measured by antennas. Based on previous studies, the incident radio wavefront is proposed to be either spherical, conical, or hyperbolic in shape; however, the shape of the radio wavefront has never been investigated in the IceCube radio antenna frequency band of 70-350 MHz. We studied the wavefront shape using CoREAS (Corsika-based Radio Emission from Air Showers) simulations for several hundred air showers of varying energies and zenith angles where the simulated emission is measured at various locations in the shower coordinate system. For each air shower, the radio wavefront is fit to a hyperbolic shape. A relationship between the air shower geometry and radio wavefront is suspected. Hence, the radio wavefront shape could be used to probe the atmospheric depth of shower maximum, which is related to the mass of the primary particle although more research is needed to form a definite conclusion. [Preview Abstract] |
Saturday, December 4, 2021 12:39PM - 12:51PM |
D03.00004: Calculation of the Askaryan Fraction of the Radio Emission from the Cosmic Ray Air Showers Ek Narayan Paudel, Alan Coleman, Frank Schroeder The mass-dependent energy spectrum of the Ultra-High-Energy cosmic rays is important to understand their source(s), how they are produced and accelerated to such high energy, as well as to understand the hadronic interaction of the particles in the high energy regime. The radio technique can improve the accuracy in the measurement of the mass and the energy of the cosmic rays. The radio emission from the Cosmic ray air shower mainly occurs due to geomagnetic emission and less-dominant Askaryan emission mechanism. The relative fraction of the Askaryan emission varies along the lateral distance from the shower axis but remains steady near the Cherenkov ring. We studied the dependence of the mean value of the Askaryan fraction as a function of various air shower parameters like zenith angle of the shower, distance to the shower maximum, etc. for many CORSIKA/CoREAS simulated air showers. The parametrization of such dependence can provide a handle to estimate cosmic ray mass-sensitive parameters using the experimentally measured value of the Askaryan fraction. [Preview Abstract] |
Saturday, December 4, 2021 12:51PM - 1:03PM |
D03.00005: Developing Monolithic Silicon Sensors for Gamma-ray Astrophysics Isabella Brewer AstroPix is a project that seeks to explore the potential of Complementary Metal Oxide Silicon (CMOS) technology in space-based high-energy astrophysics missions. Upcoming space-based missions that explore the soft- and medium-energy gamma-ray sky require detectors with precise position and energy resolution, requirements that could be met with updated tracker technology such as CMOS pixels. To gauge the potential of this silicon technology, an existing monolithic silicon detector named ATLASPix, borrowed from the CERN experiment ATLAS, was exposed to photon sources. The intrinsic energy resolution of ATLASPix, a driving parameter, was determined to be $<$10% for all tested photon sources, exceeding our baseline requirement of $<$10% at 60 keV. I will discuss how the ATLASPix performance has informed our design for future generations of AstroPix pixels. [Preview Abstract] |
Saturday, December 4, 2021 1:03PM - 1:15PM |
D03.00006: Design Study in Ultra-High Energy Neutrino Reconstruction Performance by Convolutional Neural Network with In-Ice Radio Array. Noppadol Punsuebsay Observing radio signals from Askaryan Effect produced by showers of particles when ultra-high energy neutrinos interact in glacial ice is the fundamental concept of existing experiments like Askaryan Radio Array (ARA) at South Pole and Radio Neutrino Observatory Greenland (RNO-G). A convolutional neural network is used to study vertex and neutrino reconstruction by an array of only vertical dipole antennas. The vertical and horizontal dimensions of the array are varied to optimize performance. The neural network uses true travel times and amplitudes of arriving signals obtained by simulation using NuRadioMC module in Python using South Pole ice model as the results could provide valuable experience toward IceCube Gen2 Radio. [Preview Abstract] |
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