  This study was started to know mysterious classicality of nuclei.
  Using three particles model without external environments, it is found that
decisions of respective state of three particles by decoherence are not
simultaneous. Furthermore, in this model, wave function of total three body
system collapses spontaneously without any external environments. Therefore we
may able to insist that a wavefunction of our universe has already collapsed
spontaneously without any external observer, because of the same mechanism with
this model.
