Radio detection of ultra high energy cosmic rays and neutrinos, ANITA, ARA, and TAROGE experiments

by Dr Jiwoo Nam (National Taiwan University)

Friday Apr 7, 2017, 3:00 PM → 4:00 PM Asia/Seoul

210-4호 (제1과학관)

We are facing a big challenge to improve sensitivity of Ultra-High Energy (UHE) neutrino detector (E > 1018eV)which will take over the baton of IceCube. We would need orders of magnitudes of target volume to identify origins of UHE neutrinos. A new promising approach is to use radio signals from showers induced by UHE neutrinos via the Askaryan effect. Taking a great advantage of a long attenuation length, the radio technique provides a power way to increase the target volume. As a frontier, the ANITA (ANtarctic Impulsive Transient Antenna) experiment which is a balloon-borne neutrino telescope which consists of an array of broad-band horn antennas, successfully completed four flights in Antarctica during the past decade. ANITA has showed additional detection capability of UHE cosmic rays, and possibly of earth skimming tau neutrinos. Following experiments such as Askaryan Raio Array (ARA) and Antarctic Ross Ice-Shelf ANTenna Neutrino Array (ARIANNA) have been proposed for ground based antenna arrays in Antarctica. In this talk, I will talk about the radio technique for UHE neutrinos and give a summary of existing experimental efforts in Antarctica. I also briefly describe about a similar experiment in Taiwan, TAROGE (Taiwan Radiowave Observatory for Geosynchrotron Emissions).