TY - JOUR
T1 - New candidate for an alpha cluster condensed state in 16O (α, α′) at 400 MeV
AU - Wakasa, T.
AU - Ihara, E.
AU - Fujita, K.
AU - Funaki, Y.
AU - Hatanaka, K.
AU - Horiuchi, H.
AU - Itoh, M.
AU - Kamiya, J.
AU - Röpke, G.
AU - Sakaguchi, H.
AU - Sakamoto, N.
AU - Sakemi, Y.
AU - Schuck, P.
AU - Shimizu, Y.
AU - Takashina, M.
AU - Terashima, S.
AU - Tohsaki, A.
AU - Uchida, M.
AU - Yoshida, H. P.
AU - Yosoi, M.
N1 - Funding Information:
The authors gratefully acknowledge the dedicated efforts of the RCNP cyclotron crew for providing a high-quality beam. They also thank Professor T. Yamada for valuable discussions. This work was supported in part by the Grants-in-Aid for Scientific Research Nos. 14702005 and 16654064 of the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
PY - 2007/9/20
Y1 - 2007/9/20
N2 - 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.
AB - 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.
KW - (α, α) scattering
KW - α cluster condensation
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U2 - 10.1016/j.physletb.2007.08.016
DO - 10.1016/j.physletb.2007.08.016
M3 - Article
AN - SCOPUS:34548513743
SN - 0370-2693
VL - 653
SP - 173
EP - 177
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 2-4
ER -