Tue·Sep 27, 2016Tuesday·September 27, 2016

1. 01*

   First direct measurement of the ${}^{11}$C($\alpha$, p)${}^{14}$N stellar reaction by an extended thick-target method

   S. Hayakawa🇯🇵 · S. Kubono🇨🇳 · D. Kahl🇯🇵 · H. Yamaguchi🇯🇵 · D. N. Binh🇯🇵 · T. Hashimoto🇰🇷 · Y. Wakabayashi🇯🇵 · J. J. He🇨🇳 · N. Iwasa🇯🇵 · S. Kato🇯🇵 · T. Komatsubara🇯🇵 · Y. K. Kwon🇰🇷 · T. Teranishi🇯🇵

   The ${}^{11}$C($\alpha$, p) reaction is an important $\alpha$-induced reaction competing with $\beta$-limited hydrogen-burning processes in high-temperature explosive stars. We directly measured its reaction cross sections both for the ground-state transition ($\alpha$, $p_0$) and the excited-state transitions ($\alpha$, $p_1$) and ($\alpha$, $p_2$) at relevant stellar energies 1.3 - 4.5 MeV by an extended thick-target method featuring time of flight for the first time. We revised the reaction rate by numerical integration including the ($\alpha$, $p_1$) and ($\alpha$, $p_2$) contributions and also low-lying resonances of ($\alpha$, $p_0$) using both the present and the previous experimental data which were totally neglected in the previous compilation works. The present total reaction rate lies between the previous ($\alpha$, $p_0$) rate and the total rate of the Hauser-Feshbach statistical model calculation, which is consistent with the relevant explosive hydrogen-burning scenarios such as the $\nu p$-process.

   nucl-exPRC(2016)·11 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.