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Title: Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Abstract

The rapid-neutron capture process (r process) is identified as the producer of about 50% of elements heavier than iron. This process requires an astrophysical environment with an extremely high neutron flux over a short amount of time ( seconds), creating very neutron-rich nuclei that are subsequently transformed to stable nuclei via beta decay. In 2017, one site for the r process was confiimed: the advanced LIGO and advanced Virgo detectors observed two neutron stars merging, and immediate follow-up measurements of the electromagnetic transients demonstrated an "afterglow" over a broad range of frequencies fully consistent with the expected signal of an r process taking place. Although neutronstar mergers are now known to be r-process element factories, contributions from other sites are still possible, and a comprehensive understanding and description of the r process is still lacking. One key ingredient to large-scale r-process reaction networks is radiative neutron-capture ( n , γ ) rates, for which there exist virtually no data for extremely neutron rich nuclei involved in the r process. Due to the current status of nuclear-reaction theory and our poor understanding of basic nuclear properties such as level densities and average g-decay strengths, theoretically estimated ( n , γ ) rates may vary by orders of magnitude and represent a major source of uncertainty in any nuclear-reaction network calculation of r-process abundances. Here in this review, we discuss new approaches to provide information on neutron-capture cross sections and reaction rates relevant to the r process. In particular, we focus on indirect, experimental techniques to measure radiative neutron-capture rates. While direct measurements are not available at present, but could possibly be realized in the future, the indirect approaches present a first step towards constraining neutron-capture rates of importance to the r process.

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of Oslo (Norway)
  2. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Laboratory, Joint Institute for Nuclear Astrophysics
  3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Laboratory
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1657659
Grant/Contract Number:  
NA0003221
Resource Type:
Accepted Manuscript
Journal Name:
Progress in Particle and Nuclear Physics
Additional Journal Information:
Journal Volume: 107; Journal ID: ISSN 0146-6410
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Experimental techniques; Level density; γ-ray strength function; r, process; (n, γ,) cross sections

Citation Formats

Larsen, A. C., Spyrou, A., Liddick, S. N., and Guttormsen, M. Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis. United States: N. p., 2019. Web. doi:10.1016/j.ppnp.2019.04.002.
Larsen, A. C., Spyrou, A., Liddick, S. N., & Guttormsen, M. Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis. United States. https://doi.org/10.1016/j.ppnp.2019.04.002
Larsen, A. C., Spyrou, A., Liddick, S. N., and Guttormsen, M. Fri . "Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis". United States. https://doi.org/10.1016/j.ppnp.2019.04.002. https://www.osti.gov/servlets/purl/1657659.
@article{osti_1657659,
title = {Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis},
author = {Larsen, A. C. and Spyrou, A. and Liddick, S. N. and Guttormsen, M.},
abstractNote = {The rapid-neutron capture process (r process) is identified as the producer of about 50% of elements heavier than iron. This process requires an astrophysical environment with an extremely high neutron flux over a short amount of time ( seconds), creating very neutron-rich nuclei that are subsequently transformed to stable nuclei via beta decay. In 2017, one site for the r process was confiimed: the advanced LIGO and advanced Virgo detectors observed two neutron stars merging, and immediate follow-up measurements of the electromagnetic transients demonstrated an "afterglow" over a broad range of frequencies fully consistent with the expected signal of an r process taking place. Although neutronstar mergers are now known to be r-process element factories, contributions from other sites are still possible, and a comprehensive understanding and description of the r process is still lacking. One key ingredient to large-scale r-process reaction networks is radiative neutron-capture ( n , γ ) rates, for which there exist virtually no data for extremely neutron rich nuclei involved in the r process. Due to the current status of nuclear-reaction theory and our poor understanding of basic nuclear properties such as level densities and average g-decay strengths, theoretically estimated ( n , γ ) rates may vary by orders of magnitude and represent a major source of uncertainty in any nuclear-reaction network calculation of r-process abundances. Here in this review, we discuss new approaches to provide information on neutron-capture cross sections and reaction rates relevant to the r process. In particular, we focus on indirect, experimental techniques to measure radiative neutron-capture rates. While direct measurements are not available at present, but could possibly be realized in the future, the indirect approaches present a first step towards constraining neutron-capture rates of importance to the r process.},
doi = {10.1016/j.ppnp.2019.04.002},
journal = {Progress in Particle and Nuclear Physics},
number = ,
volume = 107,
place = {United States},
year = {Fri Apr 05 00:00:00 EDT 2019},
month = {Fri Apr 05 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

First application of the Oslo method in inverse kinematics
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Combined analysis of the low-energy enhancement of the gamma-strength function and the giant dipole resonance
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