Mass measurements of neutron-rich nuclides using the Canadian Penning Trap to inform predictions in the $r$-process rare-earth peak region
Studies aiming to determine the astrophysical origins of nuclei produced by the rapid neutron capture process ($r$ process) rely on nuclear properties as inputs for simulations. The solar abundances can be used as a benchmark for such calculations, with the $r$-process rare-earth peak (REP) around m...
Gespeichert in:
Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
---|---|
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext bestellen |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Studies aiming to determine the astrophysical origins of nuclei produced by
the rapid neutron capture process ($r$ process) rely on nuclear properties as
inputs for simulations. The solar abundances can be used as a benchmark for
such calculations, with the $r$-process rare-earth peak (REP) around mass
number ($A$) 164 being of special interest due to its presently unknown origin.
With the advancement of rare isotope beam production over the last decade and
improvement in experimental sensitivities, many of these REP nuclides have
become accessible for measurement. Masses are one of the most critical inputs
as they impact multiple nuclear properties, namely the neutron-separation
energies, neutron capture rates, $\beta$-decay rates, and $\beta$-delayed
neutron emission probabilities. In this work, we report masses of 20
neutron-rich nuclides (along the Ba, La, Ce, Pr, Nd, Pm, Gd, Dy and Ho isotopic
chains) produced at the CAlifornium Rare Isotope Breeder Upgrade (CARIBU)
facility at Argonne National Laboratory. The masses were measured with the
Canadian Penning trap (CPT) mass spectrometer using the Phase-Imaging
Ion-Cyclotron-Resonance (PI-ICR) technique. We then use these new masses along
with previously published CPT masses to inform predictions for a Markov Chain
Monte Carlo (MCMC) procedure aiming to identify the astrophysical conditions
consistent with both solar data and mass measurements. We show that the MCMC
responds to this updated mass information, producing refined results for both
mass predictions and REP abundances. |
---|---|
DOI: | 10.48550/arxiv.2411.06310 |