New candidate for an alpha cluster condensed state in 16O (α, α) at 400 MeV

T. Wakasa, E. Ihara, K. Fujita, Y. Funaki, K. Hatanaka, H. Horiuchi, M. Itoh, J. Kamiya, G. Röpke, H. Sakaguchi, N. Sakamoto, Y. Sakemi, P. Schuck, Y. Shimizu, M. Takashina, S. Terashima, A. Tohsaki, M. Uchida, H. P. Yoshida, M. Yosoi

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Inelastic α scattering on 16O is studied at 400 MeV using an ice target. Near the 4α breakup threshold of 14.4 MeV, a broad peak is observed at an excitation energy of 13.6 ± 0.1  MeV with a width of 0.6 ± 0.2  MeV. The spin-parity is estimated to be 0+ from the momentum-transfer dependence. The observed width is significantly larger than that of the 0+ state at 12.0 MeV with the α + 12C structure, indicating a well-developed α cluster structure. The magnitude of the cross section is sensitive to the density distribution of the constituent α clusters. The observed cross section is consistent with the theoretical prediction for the α cluster condensed state, characterized by its dilute density distribution with a large root-mean-square radius.

Original languageEnglish
Pages (from-to)173-177
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number2-4
Publication statusPublished - 2007 Sept 20


  • (α, α) scattering
  • α cluster condensation


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