Speaker
Dr
Galina Vankova-Kirilova
(University of Sofia, Bulgaria)
Description
The ultra high energy cosmic neutrinos are source of knowledge for both astrophysical
mechanisms of particle acceleration and fundamental interactions. They open a window into the very distant and high-energy Universe that is difficult to access by any human means and devices. The possibility of detecting them in large exposure space-based apparatus, like JEM-EUSO, is an experimental challenge.
The Extreme Universe Space Observatory on-board the Japanese Experiment
Module (JEM-EUSO) on the International Space Station (ISS) is an innovative
space mission designed to detect ultra-high energy cosmic rays (UHECRs). When high energy cosmic particles interact with the atomic nuclei of air molecules they initiate extensive air
showers (EAS). Orbiting the Earth with period of 90 minutes, at an altitude of about 400 km, JEM-EUSO will detect the light from isotropic nitrogen fluorescence excited by the extensive air showers and Cherenkov radiation reflected from the earth surface or dense clouds.
In this paper we present an estimation of the feasibility of detection of UHE tau neutrino by the JEM-EUSO telescope. The interactions of tau-neutrino in sea water and earth crust has been investigated. The estimation of the propagation lenght end energy of the outgoing tau-lepton shows that if the decay of tau occurs in the atmosphere close enough to the earth surface, e.g. below $\sim 5 km$ altitude, the cascade is intensive enough and the generated light can be detected from space.
The geometrical aperture of the JEM-EUSO detector for Earth-skimming tau neutrino events has been estimated for clear sky condition, nadir mode and an average background. The results indicate that the trigger probability of the JEM-EUSO telescope increases up to $\sim$ 100 $\%$ at energies $E\nu_{\tau} \geq 8 \times 10^{19}$ eV.
| Registration number following "ICRC2015-I/" | 762 |
|---|---|
| Collaboration | JEM-EUSO |
Author
Dr
Galina Vankova-Kirilova
(University of Sofia, Bulgaria)
Co-authors
Prof.
Andrea Santangelo
(Eberhard Karls University , Tubingen, Germany)
Prof.
Mario Bertaina
(University of Turin, Italy)
Dr
Maryan Bogomilov
(Univerity of Sofia, Bulgaria)
Dr
Rosen Matev
(Univerity of Sofia, Bulgaria)
Prof.
Roumen Tsenov
(University of Sofia, Bulgaria)
Stefan Mladenov
(University of Sofia, Bulgaria)
