8-10 May 2017
Discovery Building
US/Central timezone

Telescope Array Experiment

9 May 2017, 17:24
18m
Forum (Discovery Building)

Forum

Discovery Building

330 N. Orchard Street, Madison, WI 53706
Cosmic Rays - Convenor: Andreas Haungs, KIT Cosmic Rays

Speaker

Dr Dmitri Ivanov (University of Utah)

Description

Telescope Array (TA) is the largest cosmic ray detector in the Norther hemisphere, which measures primary particles in 4 PeV to 100 EeV range. TA is a hybrid detector. The main TA detector consists of 507 plastic scintillation counters on a 1.2km square grid, overlooked by 3 fluorescence detector stations. By May 2017, TA will have collected 9 years of data above 1 EeV. Results of this contribution are based on the first 7 years of TA data. Recently built TA low energy extension detector, which consists of an additional fluorescence detector and an infill array, has now collected 2 years of data. TALE broadens the energy range of TA to 4 PeV. The following results of TA are presented: (1) Cosmic ray energy spectrum above 4 PeV, which extends over 4 orders of magnitude in energy and shows 4 features (2) Measurements of cosmic ray mass composition in 1 to 100 EeV range, which is found to be light, most likely protonic (3) Search for gamma rays and neutrinos above 1 EeV, and (4) Cosmic ray anisotropy studies above 10 EeV. We have seen an evidence of a dependence of the flux on the arrival direction, and a concentration of events above 57 EeV, called the 'hotspot', centered in the Ursa Major.

Primary author

Dr Dmitri Ivanov (University of Utah)

Presentation Materials