While the exotic symmetries discussed above refer to the point-group symmetry
effects in nuclear structure, another type of symmetries reaching more
profoundly into the effective nucleon-nucleon interactions has been discussed
recently. It is the
newly discovered, so-called P-symmetry of the effective
nuclear hamiltonians, which exists more generally in the quantum-mechanical
systems whose average field possesses at least one dichotomic symmetry, while
the two-body interactions take the form of the pairing or generalized pairing
interactions. This new symmetry results in predictions of a new conserved
quantum number (P quantum number) and it thus implies the existence
of new classification of nuclear spectra.
We would like to systematically re-interpret the best high-spin experimental information with the explicit use of the P-symmetry concept. This should be relatively an obvious verification given the fact that according to this theory, bands of the same parity and signature may additionally differ with their P quantum numbers: those with the common P quantum numbers must strongly follow the Landau-Zener rule while those with different P quantum numbers may cross without repulsions.