SEARCH FOR SIGNATURE INVERSION IN THE πi_13/2 ⊗ νi_13/2 BANDS IN ^182,184,186<font>Au</font>

Abstract

Search for low-spin signature inversion in the πi 13/2 ⊗ νi 13/2 bands in odd-odd 182,184,186 Au has been conducted through the standard in-beam γ-spectroscopy techniques. The experiments for 182 Au and 186 Au have been performed in the Japan Atomic Energy Agency (JAEA) via the 152 Sm ( 35 Cl ,5 n ) 182 Au and 172 Yb ( 19 F ,5 n ) 186 Au reactions, respectively. A study of 184 Au has been made using a multi-detector array GASP in LNL, Italy, via the 159 Tb ( 29 Si ,4 n ) 184 Au reaction. The πi 13/2 ⊗ νi 13/2 bands in these three nuclei have been identified and extended up to high-spin states. In particular, the inter-band connection between the πi 13/2 ⊗ νi 13/2 band and the ground-state band in 184 Au has been established, leading to a firm spin-and-parity assignment for the πi 13/2 ⊗ νi 13/2 band. The low-spin signature inversion is found in the πi 13/2 ⊗ νi 13/2 bands in 182,184,186 Au according to our spin-assignment and the signature crossing observed at high-spin states.