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Physical conditions for the r-process I. radioactive energy sources of kilonovae
Shinya Wanajo
Radioactive energies from unstable nuclei made in the ejecta of neutron star mergers play principal roles in powering kilonovae. In previous studies power-law-type heating rates (e…
Stochastic Chemical Evolution of Galactic Subhalos and the Origin of r-Process Elements
Takuya Ojima, Yuhri Ishimaru, Shinya Wanajo +2
Mergers of compact binaries (of a neutron star and another neutron star or a black hole, NSMs) are suggested to be the promising astrophysical site of the r-process. While the aver…
Chemical analysis of very metal-poor turn-off stars from SDSS-DR12
P. François, E. Caffau, S. Wanajo +7
The most metal-poor stars are the relics of the early chemical evolution of the Galaxy. Their chemical composition is an important tool to constrain the nucleosynthesis in the firs…
Mass Measurements of Neutron-Deficient Y, Zr, and Nb Isotopes and Their Impact on and Nucleosynthesis Processes
Y. M. Xing, K. A. Li, Y. H. Zhang +48
Using isochronous mass spectrometry at the experimental storage ring CSRe in Lanzhou, the masses of Zr and Nb were measured for the first time with an uncertainty of…
Enrichment of Zinc in galactic chemodynamical evolution models
Yutaka Hirai, Takayuki R. Saitoh, Yuhri Ishimaru +1
The heaviest iron-peak element, Zn has been used as an important tracer of cosmic chemical evolution. Spectroscopic observations of the metal-poor stars in Local Group galaxies sho…