Fig. 3
The level scheme of 180mHf, indicating the 8- - 8+ doublet, separated by 57 keV and the gamma decay modes. The 8- level is isomeric with a long half-life of about 5.5 h, due to its K = 8 angular momentum projection quantum number. The 501 keV transition exhibits the PNC effect, shown via the parity-violating E2/M2 mixing in addition to "normal" M2/E3 mixing.