Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of $A\approx 100$

Abstract

The neutron-rich mass region around $A\approx 100$ presents challenges for modeling the astrophysical $r$-process because of rapid shape transitions. We report on mass measurements using the TITAN Penning trap at TRIUMF-ISAC to attain more reliable theoretical predictions of $r$-process nucleosynthesis paths in this region. A new approach using highly charged ($q=15+$) ions has been applied which considerably saves measurement time and preserves accuracy. New mass measurements of neutron-rich ${}^{94,97,98}$Rb and ${}^{94,97-99}$Sr have uncertainties of less than 4 keV and show deviations of up to 11$\sigma$ to previous measurements. An analysis using a parameterized $r$-process model is performed and shows that mass uncertainties for the A=90 abundance region are eliminated.

References in corpus (15)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
• Nuclear weak-interaction processes in stars
• First Penning-trap mass measurement in the millisecond half-life range: the exotic halo nucleus 11Li
• First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He
• TITAN's Digital RFQ Ion Beam Cooler and Buncher, Operation and Performance
• Half-lives and branchings for β-delayed neutron emission for neutron-rich Co-Cu isotopes in the r-process
• Collectivity-induced quenching of signatures for shell closures
• First Use of High Charge States for Mass Measurements of Short-lived Nuclides in a Penning Trap
• Precise atomic masses of neutron-rich Br and Rb nuclei close to the r-process path
• Verifying the accuracy of the TITAN Penning-trap mass spectrometer
• Signatures of shape transition in odd-A neutron-rich Rubidium isotopes
• Shape evolution in Yttrium and Niobium neutron-rich isotopes
• Highly charged ions in Penning traps, a new tool for resolving low lying isomeric states
• Penning-Trap Mass Measurements of the Neutron-Rich K and Ca Isotopes: Resurgence of the N = 28 Shell Strength

Cited by in corpus (7)

• Precision Atomic Physics Techniques for Nuclear Physics with Radioactive Beams
• r-Process Nucleosynthesis: Connecting Rare-Isotope Beam Facilities with the Cosmos
• Horizons: Nuclear Astrophysics in the 2020s and Beyond
• Mass measurements of neutron-rich Rb and Sr isotopes
• Improvements to TITAN's Mass Measurement and Decay Spectroscopy Capabilities
• Prominent bump in the two-neutron separation energies of neutron-rich lanthanum isotopes revealed by high-precision mass spectrometry
• A Novel Transparent Charged Particle Detector for the CPET Upgrade at TITAN