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=Date and Place=
Jul 4th (Tue) 2023 , 16:00~ via Zoom
=Lecturer=
Dr. Hongfu Li
(Institute of Modern Physics, Chinese Academy of Sciences )
=Title=
Mass measurement of 123Pd with the Rare-RI Ring at RIBF illuminates r-process abundances trend at A=122,123
=Abstract=
The rapid neutron capture process (r-process) is responsible for producing about half of the elements heavier than iron.
Experimental masses of neutron-rich nuclei are essential for the simulation of the r-process and the improvement of the mass models. However, experimental measurement on the majority of nuclei relevant to the r-process is still very challenging due to their low yields and short half-lives.
To address these challenges, isochronous mass spectrometry, utilizing a storage ring, has emerged as a valuable technique for determining masses of short-lived exotic nuclei. The Rare RI Ring (R3) at the Radioactive Isotope Beam Factory (RIBF) is a recently commissioned cyclotron-like storage ring mass spectrometer specifically designed for studying nuclei located far from stability line. Unlike other storage rings, R3 allows for pre-identification and event-by-event measurement of the nucleus of interest, with an expected mass precision of 10^-6 within less than 1 ms. In this seminar, we present the mass measurements of isotones on the southwest of 132Sn using R3. We report an improved mass uncertainty for 123Pd and investigate the impact of this new mass data on the r-process abundance through the PRISM reaction network model.