High-energy neutrino yields from astrophysical sources: Weakly magnetized sources

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M. Kachelrieß¹ and R. Tomàs²
¹Institutt for fysikk, NTNU Trondheim, N–7491 Trondheim, Norway
²AHEP Group, Institut de Física Corpuscular - C.S.I.C/Universitat de València Edifici Instituts d'Investigació, Apt. 22085, E-46071 València, Spain

Received 26 June 2006; published 20 September 2006

Wecalculate the yield of high-energy neutrinos produced in astrophysical sourceswith negligible magnetic fields varying their interaction depth from nearlytransparent to opaque. We take into account the scattering ofsecondaries on background photons as well as the direct productionof neutrinos in decays of charm mesons. If multiple scatteringof nucleons becomes important, the neutrino spectra from meson andmuon decays are strongly modified with respect to transparent sources.Characteristic for neutrino sources containing photons as scattering targets isa strong energy-dependence of the ratio R⁰ of nu_µ andnu_e fluxes at the sources, ranging from R⁰=phi_µ/phi_e~0 below thresholdto R⁰~4 close to the energy where the decay lengthof charged pions and kaons equals their interaction length ontarget photons. Above this energy, the neutrino flux is stronglysuppressed and depends mainly on charm production.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.74.063009
DOI:	10.1103/PhysRevD.74.063009
PACS:	95.85.Ry; 98.70.Sa; 14.60.Lm; 14.60.Pq 95.85.Ry Neutrino, muon, pion, and other elementary particle astronomical observations; cosmic rays 98.70.Sa Cosmic rays including sources, origin, acceleration, and interactions 14.60.Lm Ordinary neutrinos (nu_e, nu_µ, nu_tau) 14.60.Pq Neutrino mass and mixing YEAR: 2006

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High energy neutrino yields from astrophysical sources. II. Magnetized sources
M. Kachelrieß, S. Ostapchenko, and R. Tomàs
Phys. Rev. D 77, 023007 (2008)

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Phys. Rev. D 74, 063009 (2006) [11 pages]

High-energy neutrino yields from astrophysical sources: Weakly magnetized sources

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