2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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Mass Measurements of Neutron-Rich Indium Isotopes for Enhanced r-Process Studies

5 Jun 2019, 13:45
DAC FT I (Simon Fraser University)


Simon Fraser University

Oral (Non-Student) / Orale (non-étudiant(e)) Nuclear Physics / Physique nucléaire (DNP-DPN) W2-8 Nuclear Astrophysics II (DNP) | Astrophysique nucléaire II (DPN)


Dr C. Izzo (TRIUMF)


The astrophysical r-process is responsible for the production of approximately half of the observed abundance of atomic nuclei heavier than iron. A complete understanding of the r-process requires reliable atomic mass data for neutron-rich isotopes far from stability, where experimental access is often limited by low production rates, high rates of contamination, and short half-lives. As a result, r-process simulations rely heavily on phenomenological models which predict atomic masses using extrapolations from known masses. Such predictions come with a relatively high degree of uncertainty, limiting the ability of r-process simulations to constrain the astrophysical conditions required to obtain the observed elemental abundances. In particular, recent sensitivity studies have demonstrated that reducing current uncertainties in the masses of neutron-rich indium isotopes would play an important role in constraining astrophysical models at the second r-process abundance peak around A=130.
TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) is among the world leaders in achieving precise and accurate mass measurements of exotic isotopes. The recent addition of a Multiple-Reflection Time-of-Flight (MR-TOF) mass spectrometer has further expanded the measurement capabilities at TITAN, combining high resolution with fast measurement times to achieve high-precision mass measurements of rare isotopes previously inaccessible due to high contamination rates and short half-lives. Most recently, the TITAN MR-TOF was used to measure the masses of neutron-rich indium isotopes from A=125-134. This is the first time the masses of 133,134In have ever been measured. Additionally, several isomeric state masses with half-lives as short as 5 ms were resolved from the ground state masses in these measurements. The results of these measurements will be presented along with a discussion of their impact for understanding the astrophysical r-process.

Primary author

Dr C. Izzo (TRIUMF)


T. Brunner (McGill University) K. Dietrich (TRIUMF) J. Dilling (triumf/UBC) I. Dillmann E. Dunling (TRIUMF) D. Fusco (TRIUMF/University of Waterloo) G. Gwinner (University of Manitoba) A. Jacobs (TRIUMF) B. Kootte G. Kripkó-Koncz (Justus-Liebig University Giessen) Y. Lan (TRIUMF) Prof. D. Lascar (Northwestern University) K.G. Leach (Colorado School of Mines) E. Leistenschneider (TRIUMF) M. Lykiardopoulou (TRIUMF) I. Mukul (TRIUMF) S.F. Paul (TRIUMF) M.P. Reiter (TITAN) Prof. R. Thompson (University of Calgary, Canada) J.L. Tracy, Jr. (TRIUMF) M. Wieser (University of Calgary) A.A. Kwiatkowski (TRIUMF)

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