Evidence of alpha particle condensation in 12C and 16O and Nambu-Goldstone boson
Abstract
It is suggested that direct evidence of Bose-Einstein condensation of alpha particles is obtained by observing a phase mode (Nambu-Goldstone boson) with long wavelength even when characteristic features such as superfluidity is diffucult to observe. For the 7.65 MeV 02+ Hoyle state in 12C and 15.1 MeV 0+ state in 16O, which are candidates for an alpha particle condensate, it is suggested that the emergent band head 0+ state of the K=02+ rotational band with a very large moment of inertia is considered to be a Nambu-Goldstone boson.
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