九大原子核セミナー

2007年3月7日(金) 16:30〜

講師：Dr. E. D. Johnson (Florida State University)
演題：The Role Oxygen Plays in Stellar Evolution

概要 : The reactions ¹³C(α,n) and ¹⁴C(α,γ) are thought play important roles in the in stellar evolution. Unfortunately, direct measurement of these reactions is currently impractical due to prohibitively small cross sections. This has led to the development of indirect methods of measuring reaction rates. One such method is the asymptotic normalization coefficient (ANC) technique. We measured the ANC of the most critical resonance in 17O, and were able to reduce the uncertainty in the 13C(α,n) reaction rate from 〜300% to 〜25% [E. D. Johnson et al., PRL 97 (2006)]. We used the same experimental technique to measure the ¹⁴C(α,γ) reaction rate, analysis of this experiment is not finished, but preliminary results will be discussed. We have also measured the α-cluster structure of ¹⁸O using the Thick Target Inverse Kinematics (TTIK) technique. Results of this experiment along with astrophysical implications will be discussed.

場所 : 理学部・物理・大学院講義室 ( 理学部2号館2階2263室 )



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