223 citations · 1.7k across the 45 of their papers we have counts for
45 papers
Astrophysical significance of the isomer Ag demonstrated through direct mass measurement
F. Rivero, M. Brodeur, J. A. Clark +18
The abundance of elements heavier than iron produced via the astrophysical rapid-neutron capture process depends sensitively on the atomic mass of the involved nuclei as well as th…
Investigating the effects of precise mass measurements of Ru and Pd isotopes on machine learning mass modeling
W. S. Porter, B. Liu, D. Ray +19
Atomic masses are a foundational quantity in our understanding of nuclear structure, astrophysics and fundamental symmetries. The long-standing goal of creating a predictive global…
Nuclear uncertainties associated with the ejecta of a neutron-star black-hole accretion disk
M. R. Mumpower, T. M. Sprouse, J. M. Miller +5
The simulation of heavy element nucleosynthesis requires input from yet-to-be-measured nuclear properties. The uncertainty in the values of these off-stability nuclear properties p…
Thallium-208: a beacon of in situ neutron capture nucleosynthesis
Nicole Vassh, Xilu Wang, Maude Lariviere +7
We demonstrate that the well-known 2.6 MeV gamma-ray emission line from thallium-208 could serve as a real-time indicator of astrophysical heavy element production, with both rapid…
Emergent nucleosynthesis from a 1.2 second long simulation of a black-hole accretion disk
T. M. Sprouse, K. A. Lund, J. M. Miller +2
We simulate a black-hole accretion disk system with full-transport general relativistic neutrino radiation magnetohydrodynamics (GRRMHD) for 1.2 seconds. This system is likely t…
Superheavy Elements in Kilonovae
Erika M. Holmbeck, Jennifer Barnes, Kelsey A. Lund +3
As LIGO-Virgo-KAGRA enters its fourth observing run, a new opportunity to search for electromagnetic counterparts of compact object mergers will also begin. The light curves and sp…
Executive Summary of the Topical Program: Nuclear Isomers in the Era of FRIB
G. W. Misch, M. R. Mumpower, F. G. Kondev +29
We report on the Facility for Rare Isotope Beams (FRIB) Theory Alliance topical program "Nuclear Isomers in the Era of FRIB". We outline the many ways isomers influence and contrib…
Bayesian averaging for ground state masses of atomic nuclei in a Machine Learning approach
M. R. Mumpower, M. Li, T. M. Sprouse +3
We present global predictions of the ground state mass of atomic nuclei based on a novel Machine Learning (ML) algorithm. We combine precision nuclear experimental measurements tog…
Nucleosynthesis and observation of the heaviest elements
E. M. Holmbeck, T. M. Sprouse, M. R. Mumpower
The rapid neutron capture or 'r process' of nucleosynthesis is believed to be responsible for the production of approximately half the natural abundance of heavy elements found on…
Nucleosynthesis in Outflows from Black Hole-Neutron Star Merger Disks With Full GRRMHD
Sanjana Curtis, Jonah M. Miller, Carla Frohlich +3
Along with binary neutron star mergers, the in-spiral and merger of a black hole and a neutron star is a predicted site of -process nucleosynthesis and associated kilonovae. For…
Nuclear data activities for medium mass and heavy nuclei at Los Alamos
M. R. Mumpower, T. M Sprouse, T. Kawano +7
Nuclear data is critical for many modern applications from stockpile stewardship to cutting edge scientific research. Central to these pursuits is a robust pipeline for nuclear mod…
Actinide opacities for modeling the spectra and light curves of kilonovae
C. J. Fontes, C. L. Fryer, R. T. Wollaeger +2
We extend previous ab initio calculations of lanthanide opacities (Fontes et al., 2020, MNRAS, 493, 4143) to include a complete set of actinide opacities for use in the modeling of…
Constraining inputs to realistic kilonova simulations through comparison to observed -process abundances
M. Ristic, E. M. Holmbeck, R. Wollaeger +7
Kilonovae, one source of electromagnetic emission associated with neutron star mergers, are powered by the decay of radioactive isotopes in the neutron-rich merger ejecta. Models f…
Horizons: Nuclear Astrophysics in the 2020s and Beyond
H. Schatz, A. D. Becerril Reyes, A. Best +162
Nuclear Astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the…
Physically Interpretable Machine Learning for nuclear masses
M. R. Mumpower, T. M. Sprouse, A. E. Lovell +1
We present a novel approach to modeling the ground state mass of atomic nuclei based directly on a probabilistic neural network constrained by relevant physics. Our Physically Inte…
Beta-delayed fission in the coupled Quasi-particle Random Phase Approximation plus Hauser-Feshbach approach
M. R. Mumpower, T. Kawano, T. M. Sprouse
Beta-delayed neutron emission and -delayed fission (df) probabilities were calculated for heavy, neutron-rich nuclei using the Los Alamos coupled Quasi-Particle Random Phase…
Nuclear masses learned from a probabilistic neural network
A. E. Lovell, A. T. Mohan, T. M. Sprouse +1
Machine learning methods and uncertainty quantification have been gaining interest throughout the last several years in low-energy nuclear physics. In particular, Gaussian processe…
First application of mass measurement with the Rare-RI Ring reveals the solar r-process abundance trend at A=122 and A=123
H. F. Li, S. Naimi, T. M. Sprouse +41
The Rare-RI Ring (R3) is a recently commissioned cyclotron-like storage ring mass spectrometer dedicated to mass measurements of exotic nuclei far from stability at Radioactive Iso…
Sensitivity of Neutron-Rich Nuclear Isomer Behavior to Uncertainties in Direct Transitions
G. Wendell Misch, Trevor M. Sprouse, Matthew R. Mumpower +4
Nuclear isomers are populated in the rapid neutron capture process (r process) of nucleosynthesis. The r process may cover a wide range of temperatures, potentially starting from s…
Isochronic evolution and the radioactive decay of r-process nuclei
T. M. Sprouse, G. Wendell Misch, M. R. Mumpower
We report on the creation and application of a novel decay network that uses the latest data from experiment and evaluation. We use the network to simulate the late-time phase of t…
Astromers in the radioactive decay of r-process nuclei
G. Wendell Misch, T. M. Sprouse, M. R. Mumpower
We study the impact of astrophysically relevant nuclear isomers (astromers) in the context of the rapid neutron capture process (r-process) nucleosynthesis. We compute thermally me…
Kilonovae across the nuclear physics landscape: The impact of nuclear physics uncertainties on r-process-powered emission
Jennifer Barnes, Y. L. Zhu, K. A. Lund +5
Merging neutron stars produce "kilonovae"---electromagnetic transients powered by the decay of unstable nuclei synthesized via rapid neutron capture (the r-process) in material tha…
Modeling Kilonova Light Curves: Dependence on Nuclear Inputs
Y. L. Zhu, K. Lund, J. Barnes +5
The mergers of binary neutron stars, as well as black hole-neutron star systems, are expected to produce an electromagnetic counterpart that can be analyzed to infer the element sy…
Reconstructing Masses of Merging Neutron Stars from Stellar -Process Abundance Signatures
Erika M. Holmbeck, Anna Frebel, G. C. McLaughlin +5
Neutron star mergers (NSMs) are promising astrophysical sites for the rapid neutron-capture ("-") process, but can their integrated yields explain the majority of heavy-element…