Determination of the Subthreshold State Contribution in C13(α,n)O16, the Main Neutron-Source Reaction for the s Process

S. Kubono, K. Abe, S. Kato, T. Teranishi, M. Kurokawa, X. Liu, N. Imai, K. Kumagai, P. Strasser, M. H. Tanaka, Y. Fuchi, C. S. Lee, Y. K. Kwon, L. Lee, J. H. Ha, and Y. K. Kim
Phys. Rev. Lett. 90, 062501 – Published 11 February 2003

Abstract

The reaction rate of the stellar reaction C13(α,n)O16, which is currently considered to be the main neutron source for the slow (s) process at low energies, has been rederived using the direct α-transfer reaction C13(Li6,d)O17 leading to the subthreshold state at 6.356 MeV in O17. The contribution of the subthreshold state is found to be much smaller than the currently accepted predictions for the main neutron source of the s process, indicating less of a role of this reaction as the neutron source for the s-process scenario in low-mass stars at the asymptotic giant branch.

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  • Received 18 October 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.062501

©2003 American Physical Society

Authors & Affiliations

S. Kubono1,*, K. Abe2, S. Kato2, T. Teranishi1, M. Kurokawa1, X. Liu1, N. Imai3, K. Kumagai4, P. Strasser5, M. H. Tanaka6, Y. Fuchi6, C. S. Lee7, Y. K. Kwon7, L. Lee7, J. H. Ha7, and Y. K. Kim7

  • 1Center for Nuclear Study, University of Tokyo, Wako Branch at RIKEN, Hirosawa 2-1, Wako, Saitama, 351-0198 Japan
  • 2Department of Physics, Yamagata University, Yamagata, 999-8560 Japan
  • 3Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan
  • 4Department of Physics, Tohoku University, Sendai, 980-8578 Japan
  • 5RIKEN, Hirosawa 2-1, Wako, Saitama, 351-0198 Japan
  • 6The Institute of Particle and Nuclear Study, The High Energy Accelerator Organization, Tsukuba, 305-0801 Japan
  • 7Department of Physics, Chung-Ang University, Seoul, 156-756, Republic of Korea

  • *Electronic address: kubono@cns.s.u-tokyo.ac.jp

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Vol. 90, Iss. 6 — 14 February 2003

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