Sensitive Criterion For Chirality; Chiral Doublet Bands In 104Rh59

A particle plus triaxial rotor model was applied to odd‐odd nuclei in the A ∼ 130 region in order to study the unique parity πh11/2⊗νh11/2 rotational bands. With maximum triaxiality assumed and the intermediate axis chosen as the quantization axis for the model calculations, the two lowest energy eigenstates of a given spin have chiral properties. The independence of the quantity S(I) on spin can be used as a new criterion for chirality. In addition, a diminishing staggering amplitude of S(I) with increasing spin implies triaxiality in neighboring odd‐A nuclei. Chiral quartet bases were constructed specifically to examine electromagnetic properties for chiral structures. A set of selection rules unique to chirality was derived. Doublet bands built on the πg9/2⊗νh11/2 configuration have been discovered in odd‐odd 104Rh using the 96Zr(11B, 3n) reaction. Based on the discussed criteria for chirality, it is concluded that the doublet bands observed in 104Rh exhibit characteristic chiral properties suggesting a new region of chirality around A ∼110. In addition, magnetic moment measurements have been performed to test the πh11/2⊗νh11/2 configuration in 128Cs and the πg9/2⊗νh11/2 configuration in 104Rh.