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, Takashi 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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scattering
inelastic scattering
ion beams
excitation
inverse kinematics
nuclei
separators
center of mass
energy
rays
astrophysics
parity
elastic scattering
reaction kinetics
mirrors
decay

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

α-Resonance structure in 11C studied via resonant scattering of 7Be+α and with the 7Be(α,p) reaction. / Yamaguchi, H.; Kahl, D.; Wakabayashi, Y.; Kubono, S.; Hashimoto, T.; Hayakawa, S.; Kawabata, T.; Iwasa, N.; Teranishi, Takashi; Kwon, Y. K.; Binh, D. N.; Khiem, L. H.; Duy, N. N.

In: Physical Review C - Nuclear Physics, Vol. 87, No. 3, 034303, 04.03.2013.

Research output: Contribution to journalArticle

Yamaguchi, H, Kahl, D, Wakabayashi, Y, Kubono, S, Hashimoto, T, Hayakawa, S, Kawabata, T, Iwasa, N, Teranishi, T, Kwon, YK, Binh, DN, Khiem, LH & Duy, NN 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, vol. 87, no. 3, 034303. https://doi.org/10.1103/PhysRevC.87.034303
Yamaguchi, H. ; Kahl, D. ; Wakabayashi, Y. ; Kubono, S. ; Hashimoto, T. ; Hayakawa, S. ; Kawabata, T. ; Iwasa, N. ; Teranishi, Takashi ; Kwon, Y. K. ; Binh, D. N. ; Khiem, L. H. ; Duy, N. N. / α-Resonance structure in 11C studied via resonant scattering of 7Be+α and with the 7Be(α,p) reaction. In: Physical Review C - Nuclear Physics. 2013 ; Vol. 87, No. 3.
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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.",
author = "H. Yamaguchi and D. Kahl and Y. Wakabayashi and S. Kubono and T. Hashimoto and S. Hayakawa and T. Kawabata and N. Iwasa and Takashi Teranishi and Kwon, {Y. K.} and Binh, {D. N.} and Khiem, {L. H.} and Duy, {N. N.}",
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AU - Yamaguchi, H.

AU - Kahl, D.

AU - Wakabayashi, Y.

AU - Kubono, S.

AU - Hashimoto, T.

AU - Hayakawa, S.

AU - Kawabata, T.

AU - Iwasa, N.

AU - Teranishi, Takashi

AU - Kwon, Y. K.

AU - Binh, D. N.

AU - Khiem, L. H.

AU - Duy, N. N.

PY - 2013/3/4

Y1 - 2013/3/4

N2 - 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.

AB - 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.

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