$\beta$-delayed fission in $r$-process nucleosynthesis

Abstract

We present $\beta$-delayed neutron emission and $\beta$-delayed fission calculations for heavy, neutron-rich nuclei using the coupled Quasi-Particle Random Phase Approximation plus Hauser-Feshbach (QRPA+HF) approach. From the initial population of a compound nucleus after $\beta$-decay, we follow the statistical decay taking into account competition between neutrons, $\gamma$-rays, and fission. We find a region of the chart of nuclides where the probability of $\beta$-delayed fission is $\sim 100$%, that likely prevents the production of superheavy elements in nature. For a subset of nuclei near the neutron dripline, neutron multiplicity and the probability of fission are both large, leading to the intriguing possibility of multi-chance $\beta$-delayed fission, a new decay mode for extremely neutron-rich heavy nuclei. In this new decay mode, $\beta$-decay can be followed by multiple neutron emission leading to subsequent daughter generations which each have a probability to fission. We explore the impact of $\beta$-delayed fission in rapid neutron capture process ($r$-process) nucleosynthesis in the tidal ejecta of a neutron star--neutron star merger and show that it is a key fission channel that shapes the final abundances near the second $r$-process peak.

arXiv comment9 pages, 5 figures, submitted

References in corpus (35)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Nuclear ground-state masses and deformations: FRDM(2012)
• Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event
• Electromagnetic Counterparts of Compact Object Mergers Powered by the Radioactive Decay of R-process Nuclei
• 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
• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
• Production of all the r-process nuclides in the dynamical ejecta of neutron star mergers
• Comprehensive nucleosynthesis analysis for ejecta of compact binary mergers
• R-Process Nucleosynthesis in Dynamically Ejected Matter of Neutron Star Mergers
• The impact of individual nuclear properties on $r$-process nucleosynthesis
• Radioactivity and thermalization in the ejecta of compact object mergers and their impact on kilonova light curves
• The Origin of r-Process Elements in the Milky Way
• Three-dimensional GRMHD simulations of neutrino-cooled accretion disks from neutron star mergers
• The Role of Fission in Neutron Star Mergers and its Impact on the r-Process Peaks
• r-Process Nucleosynthesis in Hot Accretion Disk Flows from Black Hole - Neutron Star Mergers
• The first direct double neutron star merger detection: implications for cosmic nucleosynthesis
• On the nuclear robustness of the r process in neutron-star mergers
• New fission fragment distributions and r-process origin of the rare-earth elements
• SkyNet: A modular nuclear reaction network library
• Superheavies: Theoretical incitements and predictions
• The impact of individual nuclear masses on $r$-process abundances
• Relative contributions of the weak, main and fission-recycling r-process
• Californium-254 and kilonova light curves
• Have Superheavy Elements been Produced in Nature?
• Formation Of The Rare Earth Peak: Gaining Insight Into Late-Time r-Process Dynamics
• Statistical Hauser-Feshbach theory with width fluctuation correction including direct reaction channels for neutron induced reaction at low energies
• Adiabatic fission barriers in superheavy nuclei
• Neutron-gamma competition for $\beta$-delayed neutron emission
• Fission Cycling in a Supernova r-process
• Reverse engineering nuclear properties from rare earth abundances in the $r$ process
• Neutrino-Induced Fission and r-Process Nucleosynthesis
• Impact of new data for neutron-rich heavy nuclei on theoretical models for $r$-process nucleosynthesis
• Neutrino-induced fission of neutron-rich nuclei
• Empirical description of beta-delayed fission partial half-lives

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• Using excitation-energy dependent fission yields to identify key fissioning nuclei in r-process nucleosynthesis
• Full Transport General Relativistic Radiation Magnetohydrodynamics for Nucleosynthesis in Collapsars
• Actinide Production in Neutron-Rich Ejecta of a Neutron Star Merger
• Production of very light elements and strontium in the early ejecta of neutron star mergers
• Primary fission fragment mass yields across the chart of nuclides
• 129I and 247Cm in Meteorites Constrain the Last Astrophysical Source of Solar r-process Elements
• Actinide-rich and Actinide-poor $r$-Process Enhanced Metal-Poor Stars do not Require Separate $r$-Process Progenitors
• Composition Effects on Kilonova Spectra and Light Curves: I
• Fission fragment distributions and their impact on the r-process nucleosynthesis in neutron star mergers
• Nucleosynthesis and observation of the heaviest elements
• Gamma-rays from kilonova: a potential probe of r-process nucleosynthesis
• Propagation of Statistical Uncertainties of Skyrme Mass Models to Simulations of $r$-Process Nucleosynthesis
• Co-production of light and heavy $r$-process elements via fission deposition
• Fission and the r-process nucleosynthesis of translead nuclei in neutron star mergers
• Actinide opacities for modeling the spectra and light curves of kilonovae
• Following nuclei through nucleosynthesis: a novel tracing technique
• First application of mass measurement with the Rare-RI Ring reveals the solar r-process abundance trend at A=122 and A=123
• MeV Gamma Rays from Fission: A Distinct Signature of Actinide Production in Neutron Star Mergers
• Fission of ${}^{240}$Pu with symmetry-restored density functional theory
• First Exploration of Neutron Shell Structure Below Lead and Beyond $\mathbf{N}=126$
• The Influence of Beta Decay Rates on r-Process Observables
• r-Process Radioisotopes from Near-Earth Supernovae and Kilonovae
• Gamma-Ray Emission Produced by $r$-process Elements from Neutron Star Mergers
• The stellar beta-decay rate of 134Cs and its impact on the Barium nucleosynthesis in the s process
• Markov Chain Monte Carlo Predictions of Neutron-rich Lanthanide Properties as a Probe of $r$-process Dynamics
• Collective neutrino oscillations and heavy-element nucleosynthesis in supernovae: exploring potential effects of many-body neutrino correlations
• Nucleosynthesis in Outflows from Black Hole-Neutron Star Merger Disks With Full GR$\nu$RMHD
• Nuclear Reaction Screening, Weak Interactions, and r-Process Nucleosynthesis in High Magnetic Fields
• Reconstructing Masses of Merging Neutron Stars from Stellar $R$-Process Abundance Signatures
• Improvements to the macroscopic-microscopic approach of nuclear fission
• Superheavy Elements in Kilonovae
• Radioactively-Powered Gamma-Ray Transient Associated with a Kilonova from Neutron Star Merger
• Sandblasting the $\text{r}$-Process: Spallation of Ejecta from Neutron Star Mergers
• Isochronic evolution and the radioactive decay of r-process nuclei
• Proposed Lunar Measurements of $r$-Process Radioisotopes to Distinguish Origin of Deep-sea 244Pu
• Beta-delayed fission in the coupled Quasi-particle Random Phase Approximation plus Hauser-Feshbach approach
• Alpha decay law of excited nuclei and its role in stellar decay rates
• Nuclear Many-Body Effect on Particle Emissions Following Muon Capture on ${}^{28}$Si and ${}^{40}$Ca
• Origin of Plutonium-244 in the Early Solar System
• Nuclear ${\beta }^{-}$-decay with statistical de-excitation
• Multi-messengers from the radioactive decay of $r$-process nuclei
• Production of neptunium and plutonium nuclides from uranium carbide using 1.4-GeV protons
• Proton-rich production of lanthanides: the $\nu i$ process
• Spallation of r-Process Nuclei Ejected from a Neutron Star Merger