SMuK 2021 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 5: Nuclear Astrophysics
HK 5.5: Talk
Monday, August 30, 2021, 17:45–18:00, H4
Mass Measurements of Proton-Rich Strontium Isotopes for rp-Process Studies — •Tobias Murböck1, Jack Henderson1,2, Zach Hockenbery1,3, Ania A. Kwiatkowski1,4, and Daniel Lascar1,5 for the TITAN collaboration — 1TRIUMF, Vancouver, Canada — 2Univ. of Surrey, England — 3McGill Univ., Montreal, Canada — 4Univ. of Victoria, Victoria, Canada — 5Northwestern Univ., Evanston, Illinois, US
The rp-process (rapid proton-capture process) consists of a series of radiative proton captures along the N=Z line up to the proton dripline. It is believed to be the primary source of nuclei that are not generated via either the rapid or slow neutron-capture process.
The energy released during the rp-process may power type-I X-ray bursts which occur in binary star systems where a neutron star accretes material from its larger partner. The calculated luminosity from an X-ray burst crucially depends on the mass values of the involved nuclei, which affect the reaction flow through the the rp-process waiting points. Here we present high-precision mass measurements of the neutron-deficient isotopes 74−76Sr. Specifically, the mass of 74Sr allows one to determine the two-proton separation energy of the 2p reaction from the waiting point 72Kr. The achieved uncertainties of a few 10 keV/c2 are precise enough to provide stringent constraints on the nuclear reaction rates in this region of the rp-process. The experiment has been performed with the multi-reflection time-of-flight mass spectrometer (MR-ToF-MS) which has been recently added to TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN).