Impact of level densities and $\gamma$-strength functions on $r$-process simulations

Abstract

Studies attempting to quantify the sensitivity of the $r$-process abundances to nuclear input have to cope with the fact that the theoretical models they rely on, rarely come with confidence intervals. This problem has been dealt with by either estimating these intervals and propagating them statistically to the final abundances using reaction networks within simplified astrophysical models, or by running more realistic astrophysical simulations using different nuclear-physics models consistently for all the involved nuclei. Both of these approaches have their strengths and weaknesses. In this work, we run $r$-process calculations for five trajectories using 49 different neutron-capture rate models. Our results shed light on the importance of taking into account shell effects and pairing correlations in the network calculations.

arXiv comment11 pages, 7 figures

References in corpus (28)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Nuclear ground-state masses and deformations: FRDM(2012)
• Astrophysical Reaction Rates From Statistical Model Calculations
• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger
• R-Process Nucleosynthesis in Dynamically Ejected Matter of Neutron Star Mergers
• Skyrme-Hartree-Fock-Bogoliubov nuclear mass formulas: Crossing the 0.6 MeV threshold with microscopically deduced pairing
• The impact of individual nuclear properties on $r$-process nucleosynthesis
• Microscopic HFB+QRPA predictions of dipole strength for astrophysics applications
• Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
• Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows. I. Spherically symmetric hydrodynamic simulations
• Current Status of r-Process Nucleosynthesis
• SkyNet: A modular nuclear reaction network library
• Novel technique for constraining r-process (n,$\gamma$) reaction rates
• Neutron-induced astrophysical reaction rates for translead nuclei
• Large-scale Continuum Random Phase Approximation predictions of dipole strength for astrophysical applications
• Impact of a low-energy enhancement in the gamma-ray strength function on the radiative neutron-capture
• Novel Techniques for Constraining Neutron-Capture Rates Relevant for r-Process Heavy-Element Nucleosynthesis
• The Influence Of Neutron Capture Rates On The Rare Earth Region Of The r-Process Abundance Pattern
• Neutron Capture Rates near A=130 which Effect a Global Change to the r-Process Abundance Distribution
• Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of ${}^{56}$Fe
• Independent Normalization for $\gamma$-ray Strength Functions: The Shape Method
• A spallation-based neutron target for direct studies of neutron-induced reactions in inverse kinematics
• Consolidating the concept of low-energy magnetic dipole decay radiation
• Sensitivity study of \emph{r}-process abundances to nuclear masses
• The intermediate neutron capture process II.Nuclear uncertainties
• Impact of systematic nuclear uncertainties on composition and decay heat of dynamical and disk ejecta in compact binary mergers
• Shell-model based study of the direct capture in neutron-rich nuclei

Cited by in corpus (2)

• Deformation, halo, and bubble structure: A paradigm shift of exotic phenomena in light to medium mass nuclei
• How Do Nuclear Isomers Influence the Gamma-Ray Bursts in Binary Neutron Star Mergers?