Nuclear g factors and structure of high-spin isomers in 190,192,194Pt and 196,198Hg
2005; Elsevier BV; Volume: 764; Linguagem: Inglês
10.1016/j.nuclphysa.2005.09.016
ISSN1873-1554
AutoresA. I. Levon, Yu. V. Nosenko, V. А. Onischuk, A. A. Schevchuk, A. E. Stuchbery,
Tópico(s)Quantum Chromodynamics and Particle Interactions
ResumoThe integral perturbed angular distribution (IPAD) method in an external magnetic field has been used to measure the g factors of isomers in the 190,192,194Pt and 196,198Hg nuclei, populated in the (α,2n)-reaction. The results are as follows: 190Pt, g(12+)=−0.17(12), g(10−)=−0.0016(36), g(7−)=+0.62(9); 192Pt, g(12+)=−0.18(9), g(10−)=−0.0012(10), g(7−)=0.48(12); 194Pt, g(12+,new assignment)=−0.17(7), g(7−)=+0.26(8); 196Hg, g(12+and10+)=−0.19(6), g(7−)=−0.030(17); 198Hg, g(12+and10+)=−0.18(8), g(7−)=−0.033(14). The intrinsic structure of the isomers is discussed. The 12+ states have the rotational-aligned (νi13/2−2) structure. The missing rotation-aligned (νi13/2−2)12+ state is suggested to be isomeric in 194Pt (instead of the 10+ state) and to which the g=−0.17(6) value has to be attributed. From the g factors of the 10− states in 190Pt and 192Pt, which have the configuration ν9/2−[505]⊗ν11/2+[615], the anomalous gl-factor for neutrons has been derived as δgl=−0.028(6). The trend from negative g factors of the 7− states in the 196,198Hg nuclei to positive values for the corresponding states in the 190,192,194Pt nuclei indicates a change in the intrinsic structure of the lowest negative-parity bands, from mainly (νi13/2−2) in Hg to mainly (πh11/2−2) in Pt.
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