Explosive synthesis of heavy elements in the Milky Way Galaxy

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Chemical abundances of the heaviest elements Thorium and Lead have been measured for Galactic stars to investigate the contributions of the neutron-capture processes that yields elements heavier than iron. Observations are extended to the metallicity range that has not well studied by previous work. We revealed that contributions of the explosive synthesis of heavy elements (the r-process) are dominant in the Galactic halo and thick disk structures, and also found a decreasing trend of scatter in abundance ratios between Thorium and other heavy elements with increasing metallicity.