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Title: Path to metallicity: Synthesis of CNO elements in standard BBN

Abstract

We perform a reanalysis of the production of CNO elements in a standard big bang nucleosynthesis scenario. The CNO yields in BBN are suppressed by the low density of the plasma, Coulomb barrier effects and the short time scales involved. Yet, the inclusion of nuclides and reactions traditionally disregarded may lead to an increase relevant enough to affect the pristine Population III stars. After a critical reanalysis and upgrade of the nuclear network our results show no major discrepancies with the ones obtained using a smaller nuclear network. The robustness of the standard predictions--the early generation of star developed in a metal-free environment--is confirmed.

Authors:
 [1];  [2]; ; ;  [1];  [3]
  1. Dipartimento di Scienze Fisiche Universita di Napoli 'Federico II' and INFN Sezione di Napoli, via Cintia, 80126 Naples (Italy)
  2. (United States)
  3. Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 (United States)
Publication Date:
OSTI Identifier:
21020441
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.75.087304; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASTROPHYSICS; CNO CYCLE; COSMOLOGY; COULOMB FIELD; ISOTOPES; NUCLEOSYNTHESIS; STARS

Citation Formats

Iocco, F., Kavli Institute for Particle Astrophysics and Cosmology PO Box 20450, Stanford, California 94309, Mangano, G., Miele, G., Pisanti, O., and Serpico, P. D. Path to metallicity: Synthesis of CNO elements in standard BBN. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.087304.
Iocco, F., Kavli Institute for Particle Astrophysics and Cosmology PO Box 20450, Stanford, California 94309, Mangano, G., Miele, G., Pisanti, O., & Serpico, P. D. Path to metallicity: Synthesis of CNO elements in standard BBN. United States. doi:10.1103/PHYSREVD.75.087304.
Iocco, F., Kavli Institute for Particle Astrophysics and Cosmology PO Box 20450, Stanford, California 94309, Mangano, G., Miele, G., Pisanti, O., and Serpico, P. D. Sun . "Path to metallicity: Synthesis of CNO elements in standard BBN". United States. doi:10.1103/PHYSREVD.75.087304.
@article{osti_21020441,
title = {Path to metallicity: Synthesis of CNO elements in standard BBN},
author = {Iocco, F. and Kavli Institute for Particle Astrophysics and Cosmology PO Box 20450, Stanford, California 94309 and Mangano, G. and Miele, G. and Pisanti, O. and Serpico, P. D.},
abstractNote = {We perform a reanalysis of the production of CNO elements in a standard big bang nucleosynthesis scenario. The CNO yields in BBN are suppressed by the low density of the plasma, Coulomb barrier effects and the short time scales involved. Yet, the inclusion of nuclides and reactions traditionally disregarded may lead to an increase relevant enough to affect the pristine Population III stars. After a critical reanalysis and upgrade of the nuclear network our results show no major discrepancies with the ones obtained using a smaller nuclear network. The robustness of the standard predictions--the early generation of star developed in a metal-free environment--is confirmed.},
doi = {10.1103/PHYSREVD.75.087304},
journal = {Physical Review. D, Particles Fields},
number = 8,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • We perform a reanalysis of the production of CNO elements in a standard Big Bang Nucleosynthesis scenario. The CNO yields in BBN are suppressed by the low density of the plasma, Coulomb barrier effects and the short time scales involved. Yet, the inclusion of nuclides and reactions traditionally disregarded may lead to an increase relevant enough to affect the pristine Population III stars. After a critical reanalysis and upgrade of the nuclear network our results show no major discrepancies with the ones obtained using a smaller nuclear network. The robustness of the standard predictions--the early generation of star developed inmore » a metal-free environment--is confirmed.« less
  • We perform an analysis of the production of elements with mass number A {ge} 12 in a standard Big Bang Nucleosynthesis scenario. The goal is to provide a more accurate estimate of the very low and yet poorly explored abundance of such elements, relevant for the pristine Population III stars. We examine the synthesis channels for these elements in a critically revised and updated version of the Wagoner-Kawano code, as well as in a further enlarged version including four additional nuclides and a significantly extended nuclear network. Our results show no major discrepancies with the ones obtained using a smallermore » nuclear network. The robustness of the standard predictions--the early generation of star developed in a metal-free environment--is confirmed.« less
  • We determined the total reaction rate of the {sup 11}C({alpha},p){sup 14}N reaction relevant to the nucleosynthesis in explosive hydrogen-burning stars. The measurement was performed by means of the thick target method in inverse kinematics with {sup 11}C RI beams. We performed the identification of the ground-state transition and excited-state transitions using time-of-flight information for the first time.
  • Primordial or big bang nucleosynthesis (BBN) is one of the three strong pieces of evidence for the big bang model together with the expansion of the universe and cosmic microwave background radiation. In this study, we improve the standard BBN calculations taking into account new nuclear physics analyses and enlarge the nuclear network up to sodium. This is, in particular, important to evaluate the primitive value of CNO mass fraction that could affect Population III stellar evolution. For the first time we list the complete network of more than 400 reactions with references to the origin of the rates, includingmore » Almost-Equal-To 270 reaction rates calculated using the TALYS code. Together with the cosmological light elements, we calculate the primordial beryllium, boron, carbon, nitrogen, and oxygen nuclei. We performed a sensitivity study to identify the important reactions for CNO, {sup 9}Be, and boron nucleosynthesis. We re-evaluated those important reaction rates using experimental data and/or theoretical evaluations. The results are compared with precedent calculations: a primordial beryllium abundance increase by a factor of four compared to its previous evaluation, but we note a stability for B/H and for the CNO/H abundance ratio that remains close to its previous value of 0.7 Multiplication-Sign 10{sup -15}. On the other hand, the extension of the nuclear network has not changed the {sup 7}Li value, so its abundance is still 3-4 times greater than its observed spectroscopic value.« less