Candidates for the 5α condensed state in 20Ne
Satoshi Adachi, Y. Fujikawa, T. Kawabata, H. Akimune, Takanobu Doi, T. Furuno, T. Harada, K. Inaba, S. Ishida, Mitsuru Itoh, Chihiro Iwamoto, N. Kobayashi, Y. Maeda, Y. Matsuda, Motoki Murata, S. Okamoto, A. Sakaue, R. Sekiya, A. Tamii, M. Tsumura
Abstract
We conducted the coincidence measurement of α particles inelastically scattered from 20Ne at 0° and decay charged particles in order to search for the alpha-particle condensed state. We compared the measured excitation-energy spectrum and decay branching ratio with the statistical-decay-model calculations, and found that the newly observed states at Ex=23.6, 21.8, and 21.2 MeV in 20Ne are strongly coupled to a candidate for the 4α condensed state in 16O. This result presents the first strong evidence that these states are the candidates for the 5α condensed state.