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Title: Using excitation-energy dependent fission yields to identify key fissioning nuclei in r -process nucleosynthesis

Journal Article · · Journal of Physics. G, Nuclear and Particle Physics
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [4];  [1]; ORCiD logo [1]; ORCiD logo [5]; ORCiD logo [5]
  1. Univ. of Notre Dame, IN (United States). Dept. of Physics
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States). Dept. of Physics
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC52-07NA27344; 89233218CNA000001
OSTI ID:
1525740
Alternate ID(s):
OSTI ID: 1544739
Report Number(s):
LLNL-JRNL-760148; LA-UR-19-22109; 948829
Journal Information:
Journal of Physics. G, Nuclear and Particle Physics, Vol. 46, Issue 6; ISSN 0954-3899
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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Decompression of initially cold neutron star matter - A mechanism for the r-process? journal August 1989
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r -PROCESS NUCLEOSYNTHESIS IN DYNAMICALLY EJECTED MATTER OF NEUTRON STAR MERGERS journal August 2011
On the astrophysical robustness of the neutron star merger r-process: Robust r-process in neutron star mergers journal October 2012
PRODUCTION OF ALL THE r -PROCESS NUCLIDES IN THE DYNAMICAL EJECTA OF NEUTRON STAR MERGERS journal June 2014
Comprehensive nucleosynthesis analysis for ejecta of compact binary mergers journal February 2015
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. II. UV, Optical, and Near-infrared Light Curves and Comparison to Kilonova Models journal October 2017
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral journal October 2017
Origin of the heavy elements in binary neutron-star mergers from a gravitational-wave event journal October 2017
The Origin of r -process Elements in the Milky Way journal March 2018
THE ROLE OF FISSION IN NEUTRON STAR MERGERS AND ITS IMPACT ON THE r -PROCESS PEAKS journal July 2015
Radioactivity and Thermalization in the Ejecta of Compact Object Mergers and Their Impact on Kilonova Light Curves journal September 2016
New Fission Fragment Distributions and r -Process Origin of the Rare-Earth Elements journal December 2013
The fundamental role of fission during r-process nucleosynthesis in neutron star mergers journal February 2015
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The Impact of Fission on R-Process Calculations text January 2016
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral other January 2017
The Impact of Fission on R-Process Calculations text January 2016
Skyrme-Hartree-Fock-Bogoliubov nuclear mass formulas: Crossing the 0.6 MeV threshold with microscopically deduced pairing text January 2009
Brownian shape motion on five-dimensional potential-energy surfaces: Nuclear fission-fragment mass distributions text January 2011
Electromagnetic Transients Powered by Nuclear Decay in the Tidal Tails of Coalescing Compact Binaries text January 2011
R-Process Nucleosynthesis in Dynamically Ejected Matter of Neutron Star Mergers text January 2011
The Electromagnetic Signals of Compact Binary Mergers text January 2012
Core-collapse supernova equations of state based on neutron star observations text January 2012
Have Superheavy Elements been Produced in Nature? text January 2012
New fission fragment distributions and r-process origin of the rare-earth elements text January 2013
Comprehensive nucleosynthesis analysis for ejecta of compact binary mergers text January 2014
The impact of individual nuclear masses on $r$-process abundances text January 2015
r-Process Lanthanide Production and Heating Rates in Kilonovae text January 2015
Microscopic Theory of Nuclear Fission: A Review text January 2015
Radioactivity and thermalization in the ejecta of compact object mergers and their impact on kilonova light curves text January 2016
Fission properties of superheavy nuclei for r-process calculations text January 2017
Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event text January 2017
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral text January 2017
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. II. UV, Optical, and Near-IR Light Curves and Comparison to Kilonova Models text January 2017
Hauser-Feshbach fission fragment de-excitation with calculated macroscopic-microscopic mass yields text January 2017
Fission barriers of neutron-rich and superheavy nuclei calculated with the ETFSI method text January 2000
Weak-interaction processes in core-collapse supernovae conference January 2015

Cited By (9)

Probing the Production of Actinides under Different r-process Conditions journal July 2019
Actinide-rich and Actinide-poor r -process-enhanced Metal-poor Stars Do Not Require Separate r -process Progenitors journal August 2019
The Lanthanide Fraction Distribution in Metal-poor Stars: A Test of Neutron Star Mergers as the Dominant r -process Site journal August 2019
Gamma Rays from Kilonova: A Potential Probe of r -process Nucleosynthesis journal February 2020
r -process Enrichment in the Galactic Halo Characterized by Nucleosynthesis Variation in the Ejecta of Coalescing Neutron Star Binaries journal January 2020
Actinide-rich and Actinide-poor $r$-Process Enhanced Metal-Poor Stars do not Require Separate $r$-Process Progenitors text January 2019
The lanthanide fraction distribution in metal-poor stars: a test of neutron star mergers as the dominant r-process site text January 2019
Gamma-rays from kilonova: a potential probe of r-process nucleosynthesis text January 2019
r-Process enrichment in the Galactic halo characterized by nucleosynthesis variation in the ejecta of coalescing neutron star binaries text January 2019

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Most theoretical approaches used in nuclear astrophysics to model the nucleosynthesis of heavy elements incorporate the so-called statistical model in order to describe the excitation and decay properties of atomic nuclei. One of the basic assumptions of this model is the validity of the Brink–Axel hypothesis and the related concept of so-called photon strength functions to describe γ-ray transition probabilities. We present a novel experimental approach that allows for the first time to experimentally determine the photon strength function simultaneously in two independent ways by a unique combination of quasi-monochromatic photon beams and a newly implemented γ–γ coincidence setup. This technique does not assume a priori the validity of the Brink–Axel hypothesis and sets a benchmark in terms of the detection sensitivity for measuring decay properties of photo-excited states below the neutron separation energy. The data for the spherical off-shell nucleus 128Te were obtained for γ-ray beam-energy settings between 3 MeV and 9 MeV in steps of 130 keV for the lower beam energies and in steps of up to 280 keV for the highest beam settings. We present a quantitative analysis on the consistency of the derived photon strength function with the Brink–Axel hypothesis. The data clearly demonstrate a discrepancy of up to a factor of two between the photon strength functions extracted from the photoabsorption and photon emission process, respectively. In addition, we observe that the photon strength functions are not independent of the excitation energy, as usually assumed. Thus, we conclude, that the Brink–Axel hypothesis is not strictly fulfilled in the excitation-energy region below the neutron separation threshold (Sn = 8.78 MeV) for the studied case of 128Te.
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