Systematic Trends of 0${}_2^{+}$, 1${}_1^{-}$, 3${}_1^{-}$ and 2${}_1^{+}$ Excited States in Even-Even Nuclei

The spin and parity ($J^{\pi }$) assignments in even-even nuclei were reviewed across the nuclear chart using the Evaluated Nuclear Structure Data File (ENSDF). The prevalence of 2${}_1^{+}$ first or lowest excited states is confirmed. The properties of 0${}_2^{+}$, 1${}_1^{-}$, and 3${}_1^{-}$ lowest excited states were reexamined using the ENSDF data evaluation procedures. The $J^{\pi }$ systematic trends and correlations between level quantum numbers and nuclear physics phenomena are discussed.