Presentation materials
The origin and evolution of heavy elements in nature are not yet fully understood. THis talk will overview the current status of models for both the formation of both r-process and nu-p-process elements. We summarize recent state-of the art developments of supernova and binary neutron star evolution in the context of both the r-process and p-process nucleosynthesis. In particular, we ...
We report that the standard evolution of radiation-dominated era (RDE) universe
The cosmological lithium problem has been known as the outstanding discrepancy of primordial lithium abundances between observations and theoretical predictions. We have measured key nuclear reactions which act to reduce
We also performed
Our study links cosmic evolutions in the extended Starobinsky model (eSM), Big Bang Nucleosynthesis (BBN), and early universe chemistry. We demonstrate standard and oscillating cosmic evolutions and discuss BBN constraints. By connecting BBN abundances to the early universe chemistry, we identify the formation of intriguing and critical molecular structures. These findings underscore the...
Searching for varying dimensionless physical constants presents a meaningful characteristic in experimental and observational studies. One of the most valuable explorations of these variations could depend on the evolution of white dwarf stars. Applying the spectrum of white dwarf star: G191-B2B, we derive a robust limit on the cosmological variation of the gravitational constant...
We present a detailed chemical abundance analysis for about 40 Very Metal-Poor (VMP; [Fe/H] < -2.0), selected from Sloan Digital Sky Survey (SDSS) and Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) surveys. Their high-resolution (R ~ 45,000) spectra were obtained with GEMINI/GRACES, and their atmospheric stellar parameters and various chemical abundance ratios were derived....
Neutron induced reactions on unstable nuclei play a significant role in the nucleosynthesis of the elements in the cosmos. Their interest range from the primordial processes occurred during the Big Bang Nucleosynthesis up to the “stellar cauldrons” where neutron capture reactions build up heavy elements. In the last years, several efforts have been made to investigate the possibility of...
