Hannover 2013 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Precision Mass Spectrometry and Fundamental Applications I

MS 1.1: Hauptvortrag

Montag, 18. März 2013, 11:00–11:30, F 442

Reducing nuclear physics uncertainties in r-process models using high-precision mass measurements of highly charged, neutron-rich Rb and Sr ions — •Vanessa V. Simon — TRIUMF, 4004 Wesbrook Mall, V6T2A3, Vancouver, Canada

High-precision atomic mass measurements are vital for the description of nuclear structure, investigations of nuclear astrophysical processes, and tests of fundamental symmetries. The neutron-rich A≈100 region presents challenges for modeling the astrophysical r-process because of sudden nuclear shape transitions. We report on high-precision masses of short-lived neutron-rich ^94,97,98Rb and ^94,97−99Sr isotopes using the TITAN Penning-trap mass spectrometer at TRIUMF. The isotopes were charge-bred to q=15+ and uncertainties of less than 4 keV were achieved. Results deviate by up to 11σ compared to earlier measurements and extend the region of nuclear deformation observed in the A≈100 region. A parameterized r-process model network calculation shows that mass uncertainties for the elemental abundances in this region are now negligible.

To increase the overall efficiency and precision of the mass measurement of highly charged ions, the novel trap CPET is introduced for the purpose of cooling highly charged ions sympathetically using either electrons or protons. The status of the setup and commissioning experiments are presented.