First direct measurement of the C11(α,p)N14 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, and T. Teranishi
Phys. Rev. C 93, 065802 – Published 7 June 2016

Abstract

The C11(α,p)14N reaction is an important α-induced reaction competing with β-limited hydrogen-burning processes in high-temperature explosive stars. We directly measured its reaction cross sections both for the ground-state transition (α,p0) and the excited-state transitions (α,p1) and (α,p2) 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 (α,p1) and (α,p2) contributions and also low-lying resonances of (α,p0) 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 (α,p0) 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 νp process.

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  • Received 6 August 2015
  • Revised 25 April 2016

DOI:https://doi.org/10.1103/PhysRevC.93.065802

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. Hayakawa1,*, S. Kubono1,2,3, D. Kahl1,4, H. Yamaguchi1, D. N. Binh5, T. Hashimoto6, Y. Wakabayashi2, J. J. He3, N. Iwasa7, S. Kato8, T. Komatsubara2, Y. K. Kwon6, and T. Teranishi9

  • 1Center for Nuclear Study, the University of Tokyo, RIKEN campus, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 2RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 3Institute of Modern Physics, Chinese Academy of Science, Nanchang Road 509, Lanzhou 730000, People's Republic of China
  • 4School of Physics and Astronomy, the University of Edinburgh, James Clerk Maxwell Building, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, UK
  • 5Institute of Physics, Vietnamese Academy for Science and Technology, 10 Daotan, Thule, Badinh, Hanoi, Vietnam
  • 6Rare Isotope Science Project, Institute for Basic Science, Yuseong-gu Daejeon 305-811, Republic of Korea
  • 7Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
  • 8Department of Physics, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata 990-8560, Japan
  • 9Department of Physics, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

  • *hayakawa@cns.s.u-tokyo.ac.jp

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Vol. 93, Iss. 6 — June 2016

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