Consistent analysis of the 2+ excitation of the 12C Hoyle state populated in proton and α-particle inelastic scattering

M. Freer, M. Itoh, T. Kawabata, H. Fujita, H. Akimune, Z. Buthelezi, J. Carter, R. W. Fearick, S. V. Förtsch, M. Fujiwara, U. Garg, N. Hashimoto, K. Kawase, S. Kishi, T. Murakami, K. Nakanishi, Y. Nakatsugawa, B. K. Nayak, R. Neveling, S. OkumuraS. M. Perez, P. Papka, H. Sakaguchi, Y. Sasamoto, F. D. Smit, J. A. Swartz, H. Takeda, S. Terashima, M. Uchida, I. Usman, Y. Yasuda, M. Yosoi, J. Zenihiro

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Abstract

The 12C excitation energy spectra populated in both proton and α-particle inelastic scattering measurements are examined. The data indicate the existence of a 2+ state at Ex=9.75(0.15) MeV with a width of 750(150)keV. It is believed that this state corresponds to the 2+ excitation of the 7.65 MeV, 0+, Hoyle state, which acts as the main path by which carbon is synthesized in stars. A simultaneous R-matrix analysis of the two sets of data indicates that the 2+ state possesses a very large α-reduced width, approaching the Wigner limit. This would indicate that the state is associated with a highly clustered structure. The potential geometric arrangements of the clusters is discussed.

Original languageEnglish
Article number034320
JournalPhysical Review C - Nuclear Physics
Volume86
Issue number3
DOIs
Publication statusPublished - 2012 Sep 14

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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