Neutrino flavor ratios modified by cosmic-ray secondary acceleration

Norita Kawanaka and Kunihito Ioka
Phys. Rev. D 92, 085047 – Published 30 October 2015

Abstract

Acceleration of π’s and μ’s modifies the flavor ratio at Earth (at astrophysical sources) of neutrinos produced by π decay, νeνμντ, from 111 (120) to 11.81.8 (010) at high energy, because π’s decay more than μ’s during secondary acceleration. The neutrino spectrum accompanies a flat excess, differently from the case of energy losses. With the flavor spectra, we can probe time scales of cosmic-ray acceleration and shock dynamics. We obtain general solutions of convection-diffusion equations and apply them to gamma-ray bursts, which may have the flavor modification at around PeV–EeV detectable by IceCube and next-generation experiments.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 20 April 2015

DOI:https://doi.org/10.1103/PhysRevD.92.085047

© 2015 American Physical Society

Authors & Affiliations

Norita Kawanaka*

  • Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Kunihito Ioka

  • Theory Center, Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801, Japan and Department of Particle and Nuclear Physics, SOKENDAI (The Graduate University for Advanced Studies), Tsukuba 305-0801, Japan

  • *norita@astron.s.u-tokyo.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 92, Iss. 8 — 15 October 2015

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×