  Many experiments have confirmed the spectral hardening in a few hundred GV of
cosmic ray (CR) nuclei spectra, and 3 different origins have been proposed: the
primary source acceleration, the propagation, and the superposition of
different kinds of sources. In this work, the break power law has been employed
to fit each of the AMS-02 nuclei spectra directly when the rigidity greater
than 45 GV. The fitting results of the break rigidity and the spectral index
differences less and greater than the break rigidity show complicated
relationships among different nuclei species, which could not been reproduced
naturally by a simple primary source scenario or a propagation scenario.
However, with a natural and simple assumption, the superposition of different
kinds of sources could have the potential to explain the fitting results
successfully. CR nuclei spectra from one single experiment in future (such as
DAMPE) will provide us the opportunity to do cross checks and reveal the
properties of the different kinds of sources.
