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Title: Helium photodisintegration and nucleosynthesis: Implications for topological defects, high energy cosmic rays, and massive black holes

Abstract

We consider the production of {sup 3}He and {sup 2}H by {sup 4}He photodisintegration initiated by nonthermal energy releases during early cosmic epochs. We find that this process cannot be the predominant source of primordial {sup 2}H since it would result in anomalously high {sup 3}He/D ratios in conflict with standard chemical evolution assumptions. We apply this fact to constrain topological defect models of highest energy cosmic ray (HECR) production. Such models have been proposed as possible sources of ultrahigh energy particles and {gamma} rays with energies above 10{sup 20} eV. The constraints on these models derived from {sup 4}He photodisintegration are compared to corresponding limits from spectral distortions of the cosmic microwave background radiation and from the observed diffuse {gamma}-ray background. It is shown that for reasonable primary particle injection spectra superconducting cosmic strings, unlike ordinary strings or annihilating monopoles, cannot produce the HECR flux at the present epoch without violating at least the {sup 4}He-photodisintegration bound. The constraint from the diffuse {gamma}-ray background rules out the dominant production of HECR by the decay of grand unification particles in models with cosmological evolution assuming standard fragmentation functions. Constraints on massive black hole induced photodisintegration are also discussed. {copyright} 1995more » The American Physical Society.« less

Authors:
; ; ;  [1]
  1. Department of Astronomy and Astrophysics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433 (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
147834
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Physical Review, D
Additional Journal Information:
Journal Volume: 52; Journal Issue: 12; Other Information: PBD: 15 Dec 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HELIUM 4 TARGET; PHOTONUCLEAR REACTIONS; COSMIC RADIATION; NUCLEOSYNTHESIS; BLACK HOLES; HELIUM 3; DEUTERONS; MONOPOLES; FRAGMENTATION; CONSTRAINTS

Citation Formats

Sigl, G, Jedamzik, K, Schramm, D N, Berezinsky, V S, NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, Department of Physics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433, University of California, Lawrence Livermore National Laboratory, Livermore, California 94550, and INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi. Helium photodisintegration and nucleosynthesis: Implications for topological defects, high energy cosmic rays, and massive black holes. United States: N. p., 1995. Web. doi:10.1103/PhysRevD.52.6682.
Sigl, G, Jedamzik, K, Schramm, D N, Berezinsky, V S, NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, Department of Physics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433, University of California, Lawrence Livermore National Laboratory, Livermore, California 94550, & INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi. Helium photodisintegration and nucleosynthesis: Implications for topological defects, high energy cosmic rays, and massive black holes. United States. https://doi.org/10.1103/PhysRevD.52.6682
Sigl, G, Jedamzik, K, Schramm, D N, Berezinsky, V S, NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, Department of Physics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433, University of California, Lawrence Livermore National Laboratory, Livermore, California 94550, and INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi. Fri . "Helium photodisintegration and nucleosynthesis: Implications for topological defects, high energy cosmic rays, and massive black holes". United States. https://doi.org/10.1103/PhysRevD.52.6682.
@article{osti_147834,
title = {Helium photodisintegration and nucleosynthesis: Implications for topological defects, high energy cosmic rays, and massive black holes},
author = {Sigl, G and Jedamzik, K and Schramm, D N and Berezinsky, V S and NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 and Department of Physics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433 and University of California, Lawrence Livermore National Laboratory, Livermore, California 94550 and INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi},
abstractNote = {We consider the production of {sup 3}He and {sup 2}H by {sup 4}He photodisintegration initiated by nonthermal energy releases during early cosmic epochs. We find that this process cannot be the predominant source of primordial {sup 2}H since it would result in anomalously high {sup 3}He/D ratios in conflict with standard chemical evolution assumptions. We apply this fact to constrain topological defect models of highest energy cosmic ray (HECR) production. Such models have been proposed as possible sources of ultrahigh energy particles and {gamma} rays with energies above 10{sup 20} eV. The constraints on these models derived from {sup 4}He photodisintegration are compared to corresponding limits from spectral distortions of the cosmic microwave background radiation and from the observed diffuse {gamma}-ray background. It is shown that for reasonable primary particle injection spectra superconducting cosmic strings, unlike ordinary strings or annihilating monopoles, cannot produce the HECR flux at the present epoch without violating at least the {sup 4}He-photodisintegration bound. The constraint from the diffuse {gamma}-ray background rules out the dominant production of HECR by the decay of grand unification particles in models with cosmological evolution assuming standard fragmentation functions. Constraints on massive black hole induced photodisintegration are also discussed. {copyright} 1995 The American Physical Society.},
doi = {10.1103/PhysRevD.52.6682},
url = {https://www.osti.gov/biblio/147834}, journal = {Physical Review, D},
number = 12,
volume = 52,
place = {United States},
year = {1995},
month = {12}
}