Seven and nine quasi-particleK-isomers in175Hf
NewK-isomers with very high spin (up to 57/2) have been found in175Hf. This is the highest spin isomer seen in deformed nuclei and involves 9 quasi-particles. The predominant decay to the I=55/2 state in aKπ=35/2−, 5 quasi-particle rotational band further demonstrates the surprising breakdown of theK-selection rules, reported previously in neighbouring nuclei.