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Abstract:
The Giant Radio Array for Neutrino Detection (GRAND) aims to detect ultra-high-energy neutrinos, cosmic rays, and gamma rays using radio antennas. In its final design, the radio array will contain 200,000 antennas and cover 200,000 km^2, split into sub-arrays of ~10,000 km^2 deployed worldwide. The strategy of GRAND is to detect coherent radio-emission in the 50-200 MHz range induced by the interaction of ultra-high-energy particles in the atmosphere or the Earth's crust. GRAND plans to reach a neutrino-sensitivity of ~10^{-10} GeV cm^{-2} s^{-1} sr^{-1} above 5x 10^17 eV combined with a sub-degree angular resolution. This project will likely ensure the detection of cosmogenic neutrinos produced in the most common scenarios.
GRANDProto300, the 300-antenna pathfinder array, is planned to start operation in 2022. It aims to demonstrate autonomous radio detection of inclined air-showers and study cosmic rays around the transition between Galactic and extra-Galactic sources. We present preliminary designs and simulation results, plans for the ongoing, staged approach to construction, and the rich research program made possible by the proposed sensitivity and angular resolution.
Biography:
Yi Zhang is a Professor at Purple Mountain Observatory (PMO) Chinese Academy of Sciences. Yi obtained his bachelor's degree from Tsinghua University in 2003 and completed his PhD in particle physics at the Institute of High Energy Physics in 2008. Yi's research focuses on high-energy observational astrophysics and cosmic-ray detector technology. As the main contributor, he obtained the two-dimensional high-precision cosmic-ray anisotropy map for energies from several hundred TeV by improving the all-sky survey method. He played an essential role in the data analysis of LHAASO and discovered the third case of the extended gamma-ray halo emission around a middle-aged pulsar J0622+3749. Yi is now conducting the construction of the first phase array of GRAND and leading the GRAND simulation and analysis team at PMO, which promotes the successful development and growth of the GRAND project.