1301.7485 (S. Ohkubo)

Evidence of alpha particle condensation in $^{12}$C and $^{16}$O and
Nambu-Goldstone boson    [PDF]

S. Ohkubo

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 $0_2^+$ Hoyle state in $^{12}$C and 15.1 MeV $0^+$ state in $^{16}$O, which are candidates for an alpha particle condensate, it is suggested that the emergent band head $0^+$ state of the $K=0_2^+$ rotational band with a very large moment of inertia is considered to be a Nambu-Goldstone boson.

View original: http://arxiv.org/abs/1301.7485