223 citations · 1.2k across the 33 of their papers we have counts for
35 papers
Machine Learning -decay Half-lives and Their Application to -Process Observables
Mengke Li, Flora Wang, Jonathan Engel +3
Accurately modeling -decay half-lives of highly neutron-rich nuclei is a critical challenge for understanding -process nucleosynthesis and the resulting kilonova light curves…
TITAN mass measurements of neutron-rich Cs, Ba and r-process lanthanide abundances
T. -H. Yeh, J. D. Cardona, Y. Wang +26
We present measurements for the masses of five neutron-rich isotopes, Cs and Ba, probed for the first time by TITAN at TRIUMF with time-of-flight measureme…
Identifying observable MeV lines from the decays of weak and main -process isotopes in mergers
Maude Lariviere, Nicole Vassh, Yanwen Deng +2
We consider predictions for the MeV gamma-ray spectrum emitted by the decays of freshly synthesized isotopes from a neutron star merger at timescales of relevance for post-merg…
Constraining Nuclear Mass Models Using r-process Observables with Multi-objective Optimization
Mengke Li, Matthew Mumpower, Nicole Vassh +2
Predicting nuclear masses is a longstanding challenge. One path forward is machine learning (ML) which trains on experimental data, but can suffer large errors when extrapolating t…
Classifying metal-poor stars with machine learning using nucleosynthesis calculations
Nicole Vassh, Yilin Wang, Richard M. Woloshyn +4
We apply the capabilities of machine learning (ML) to discern patterns in order to classify metal-poor stars. To do so, we train an ML model on a bank of nucleosynthesis calculatio…
Multidisciplinary Science in the Multimessenger Era
Eric Burns, Christopher L. Fryer, Ivan Agullo +82
Astrophysical observations of the cosmos allow us to probe extreme physics and answer foundational questions on our universe. Modern astronomy is increasingly operating under a hol…
Motivations for Early High-Profile FRIB Experiments
B. Alex Brown, Alexandra Gade, S. Ragnar Stroberg +39
This white paper is the result of a collaboration by those that attended a workshop at the Facility for Rare Isotope Beams (FRIB), organized by the FRIB Theory Alliance (FRIB-TA),…
Mass measurements of neutron-rich nuclides using the Canadian Penning Trap to inform predictions in the -process rare-earth peak region
D. Ray, N. Vassh, B. Liu +25
Studies aiming to determine the astrophysical origins of nuclei produced by the rapid neutron capture process ( process) rely on nuclear properties as inputs for simulations. Th…
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…
Element abundance patterns in stars indicate fission of nuclei heavier than uranium
Ian U. Roederer, Nicole Vassh, Erika M. Holmbeck +9
The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elemen…
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…
The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks
Ian U. Roederer, John J. Cowan, Marco Pignatari +11
We present new observational benchmarks of rapid neutron-capture process (r-process) nucleosynthesis for elements at and between the first (A ~ 80) and second (A ~ 130) peaks. Our…
Origin of Plutonium-244 in the Early Solar System
Maria Lugaro, Andrés Yagüe López, Benjámin Soós +5
We investigate the origin in the early Solar System of the short-lived radionuclide 244Pu (with a half life of 80 Myr) produced by the rapid (r) neutron-capture process. We conside…
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…
The need for a local nuclear physics feature in the neutron-rich rare-earths to explain solar -process abundances
Nicole Vassh, Gail C. McLaughlin, Matthew R. Mumpower +1
We apply Markov Chain Monte Carlo to predict the masses required to form the observed solar -process rare-earth abundance peak. Given highly distinct astrophysical outflows and…
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…
MeV Gamma Rays from Fission: A Distinct Signature of Actinide Production in Neutron Star Mergers
Xilu Wang, Nicole Vassh, Trevor Sprouse +4
Neutron star mergers (NSMs) are the first verified sites of rapid neutron capture (r-process) nucleosynthesis, and could emit gamma rays from the radioactive isotopes synthesized i…
Probing the fission properties of neutron-rich actinides with the astrophysical process
Nicole Vassh, Matthew R. Mumpower, Trevor M. Sprouse +2
We review recent work examining the influence of fission in rapid neutron capture (-process) nucleosynthesis which can take place in astrophysical environments. We briefly discu…
129I and 247Cm in Meteorites Constrain the Last Astrophysical Source of Solar r-process Elements
Benoit Côté, Marius Eichler, Andrés Yagüe +12
The composition of the early Solar System can be inferred from meteorites. Many elements heavier than iron were formed by the rapid neutron-capture process (r process), but the ast…
Markov Chain Monte Carlo Predictions of Neutron-rich Lanthanide Properties as a Probe of -process Dynamics
Nicole Vassh, Gail C. McLaughlin, Matthew R. Mumpower +1
Lanthanide element signatures are key to understanding many astrophysical observables, from merger kilonova light curves to stellar and solar abundances. To learn about the lanthan…
Spallation of r-Process Nuclei Ejected from a Neutron Star Merger
Xilu Wang, Brian D. Fields, Matthew Mumpower +3
Neutron star mergers (NSMs) are rapid neutron capture (r-process) nucleosynthesis sites, which eject materials at high velocities, from 0.1c to as high as 0.6c. Thus the r-process…
Characterizing -Process Sites through Actinide Production
Erika M. Holmbeck, Rebecca Surman, Anna Frebel +6
Of the variations in the elemental abundance patterns of stars enhanced with -process elements, the variation in the relative actinide-to-lanthanide ratio is among the most sign…
Co-production of light and heavy -process elements via fission deposition
Nicole Vassh, Matthew R. Mumpower, Gail C. McLaughlin +2
We apply for the first time fission yields determined across the chart of nuclides from the macroscopic-microscopic theory of the Finite Range Liquid Drop Model to simulations of r…