566 citations · 7.6k across the 203 of their papers we have counts for
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Ultra-Lithium-Deficient Halo Stars and Blue Stragglers: A Common Origin?
Sean G. Ryan, Timothy C. Beers, Toshitaka Kajino +1
We present data for four ultra-Li-deficient, warm, halo stars. The Li deficiency of two of these is a new discovery. Three of the four stars have effective temperatures Teff ~ 6300…
Abundances and Evolution of Lithium in the Galactic Halo and Disk
Sean G. Ryan, Toshitaka Kajino, Timothy C. Beers +4
We have measured the Li abundance of 18 stars with -2 <~ [Fe/H] ~< -1 and 6000 K <~ Teff <~ 6400 K, a parameter range that was poorly represented in previous studies. We examine th…
Impact of Few-Body Reactions on Explosive Nucleosynthesis: The Big-Bang and Supernovae
Toshitaka Kajino, Kaori Otsuki, Shin-ya Wanajo +2
We study the few body reactions in explosive nucleosynthesis of light-to-heavy mass elements in various astrophysical conditions. In neutrino-driven winds of gravitational core col…
New Detremination Method of Primordial Li Abundance
T. Kajino, T. -K. Suzuki, S. Kawanomoto +1
We discuss the primordial nucleosynthesis in lepton asymmetric Universe models. In order to better estimate the universal baryon-mass density parameter , we try to remove the…
Neutrino Degeneracy and Decoupling: New Limits from Primordial Nucleosynthesis and the Cosmic Microwave Background
M. Orito, T. Kajino, G. J. Mathews +1
We reanalyze the cosmological constraints on the existence of a net universal lepton asymmetry and neutrino degeneracy. We show that neutrinos can begin to decouple at higher tempe…