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Title: Upper limit to the diffuse cosmic ultrahigh-energy. gamma. spectrum

Abstract

An upper limit to the difuse cosmic ultrahigh-energy (UHE) {gamma} spectrum from {similar to}5 TeV up to {similar to}1 PeV is inferred from data on the spectrum of the electromagnetic component of secondary cosmic rays recorded by emulsion-chamber experiments at various atmospheric depths. Our Monte Carlo simulation of the atmospheric propagation and interaction of the photons and protons with primary energies of (5{times}10{sup 12})--10{sup 15} eV shows that the intensity of uncorrelated {gamma} events with visible energies {ital E}{sub {gamma}}=5--100 TeV observed in emulsion-chamber experiments is sensitive to the diffuse cosmic UHE {gamma} rays at the level of {similar to}10{sup {minus}3} compared to primary cosmic rays in the same energy region, depending on the atmospheric depth of the observation level. We also discuss the relevance of the UHE {gamma} spectrum to topics such as diffuse photons as by-products of the energy loss of extragalactic cosmic rays interacting with the cosmic 2.7 K background radiation, direct photons as a result of possible new production mechanisms, and photons as products of radiative decay of unstable cosmological relic neutrinos of mass {similar to}5 TeV--1 PeV.

Authors:
 [1];  [2]
  1. Department of Physics and Space Sciences Laboratory, University of California, Berkeley, California (USA) Nuclear Science Division, Lawrence Berkely Laboratory, Berkeley, California (USA)
  2. Institute of High Energy Physics, Academia Sinica, Beijing 100039 (China) Istituto Nazionale di Fisica Nucleare, 67010, Assergi (AQ) (Italy)
Publication Date:
OSTI Identifier:
6135959
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Physical Review, D (Particles Fields); (United States)
Additional Journal Information:
Journal Volume: 44:9; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMIC PHOTONS; ENERGY SPECTRA; CASCADE SHOWERS; GAMMA SPECTRA; HADRON-HADRON INTERACTIONS; MONTE CARLO METHOD; MULTIPLE PRODUCTION; NUCLEAR EMULSIONS; PEV RANGE; PHOTOPRODUCTION; RELICT RADIATION; SECONDARY COSMIC RADIATION; TEV RANGE; BASIC INTERACTIONS; BOSONS; COSMIC RADIATION; ELECTROMAGNETIC INTERACTIONS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ENERGY RANGE; INTERACTIONS; IONIZING RADIATIONS; MASSLESS PARTICLES; MICROWAVE RADIATION; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PHOTONS; RADIATIONS; SHOWERS; SPECTRA; 662390* - Electromagnetic Processes & Properties- (1992-); 662340 - Hadron Interactions- (1992-)

Citation Formats

He, Y D, and Zhu, Q Q. Upper limit to the diffuse cosmic ultrahigh-energy. gamma. spectrum. United States: N. p., 1991. Web. doi:10.1103/PhysRevD.44.R2635.
He, Y D, & Zhu, Q Q. Upper limit to the diffuse cosmic ultrahigh-energy. gamma. spectrum. United States. https://doi.org/10.1103/PhysRevD.44.R2635
He, Y D, and Zhu, Q Q. Fri . "Upper limit to the diffuse cosmic ultrahigh-energy. gamma. spectrum". United States. https://doi.org/10.1103/PhysRevD.44.R2635.
@article{osti_6135959,
title = {Upper limit to the diffuse cosmic ultrahigh-energy. gamma. spectrum},
author = {He, Y D and Zhu, Q Q},
abstractNote = {An upper limit to the difuse cosmic ultrahigh-energy (UHE) {gamma} spectrum from {similar to}5 TeV up to {similar to}1 PeV is inferred from data on the spectrum of the electromagnetic component of secondary cosmic rays recorded by emulsion-chamber experiments at various atmospheric depths. Our Monte Carlo simulation of the atmospheric propagation and interaction of the photons and protons with primary energies of (5{times}10{sup 12})--10{sup 15} eV shows that the intensity of uncorrelated {gamma} events with visible energies {ital E}{sub {gamma}}=5--100 TeV observed in emulsion-chamber experiments is sensitive to the diffuse cosmic UHE {gamma} rays at the level of {similar to}10{sup {minus}3} compared to primary cosmic rays in the same energy region, depending on the atmospheric depth of the observation level. We also discuss the relevance of the UHE {gamma} spectrum to topics such as diffuse photons as by-products of the energy loss of extragalactic cosmic rays interacting with the cosmic 2.7 K background radiation, direct photons as a result of possible new production mechanisms, and photons as products of radiative decay of unstable cosmological relic neutrinos of mass {similar to}5 TeV--1 PeV.},
doi = {10.1103/PhysRevD.44.R2635},
url = {https://www.osti.gov/biblio/6135959}, journal = {Physical Review, D (Particles Fields); (United States)},
issn = {0556-2821},
number = ,
volume = 44:9,
place = {United States},
year = {1991},
month = {11}
}