α-Resonance structure in 11C studied via resonant scattering of 7Be+α and with the 7Be(α,p) reaction

H. Yamaguchi, D. Kahl, Y. Wakabayashi, S. Kubono, T. Hashimoto, S. Hayakawa, T. Kawabata, N. Iwasa, T. Teranishi, Y. K. Kwon, D. N. Binh, L. H. Khiem, N. N. Duy

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Abstract

Background: The resonance structure in 11C is of particular interest with regard to the astrophysical 7Be(α,γ) reaction, relevant at high temperature, and to the α-cluster structure in 11C. Purpose: The measurement was made to determine the unknown resonance parameters for the high excited states of 11C. In particular, the α-decay width can be useful information to discuss the α-cluster structure in 11C. Methods: New measurements of 7Be+α resonant scattering and the 7Be(α,p)10B reaction in inverse kinematics were performed for center-of-mass energy up to 5.5 MeV, and the resonances at excitation energies of 8.9-12.7 MeV in the compound 11C nucleus were studied. Inelastic scattering of 7Be+α and the 7Be(α,p1)10B* reaction were also studied with a simultaneous γ-ray measurement. The measurements were performed at the low-energy radioactive ion beam facility CRIB (CNS Radioactive Ion Beam separator) of the Center for Nuclear Study, the University of Tokyo. Results: We obtained excitation functions of 7Be(α,α0)7Be (elastic scattering), 7Be(α,α1)7Be* (inelastic scattering), 7Be(α,p0)10B, and 7Be(α,p 1)10B*. Many resonances including a new one were observed and their parameters were determined by using an R-matrix analysis. Conclusions: The resonances we observed possibly enhance the 7Be(α,γ) reaction rate but with a smaller magnitude than the lower-lying resonances. A new negative-parity cluster band, similar to the one previously suggested in the mirror nucleus 11B, is proposed.

Original languageEnglish
Article number034303
JournalPhysical Review C - Nuclear Physics
Volume87
Issue number3
DOIs
Publication statusPublished - Mar 4 2013

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Yamaguchi, H., Kahl, D., Wakabayashi, Y., Kubono, S., Hashimoto, T., Hayakawa, S., ... Duy, N. N. (2013). α-Resonance structure in 11C studied via resonant scattering of 7Be+α and with the 7Be(α,p) reaction. Physical Review C - Nuclear Physics, 87(3), [034303]. https://doi.org/10.1103/PhysRevC.87.034303