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Backbending in the 90 223 Th nucleus: presentation of the consistency of two different experiments

The detailed level structure of 223 Th has been investigated in measurements of γ radiations following the fusion-evaporation channel of the 208 Pb ( 18 O , 3 n ) 223 Th reaction at 85 MeV beam energy. The present data are extracted from two different experiments performed with the EUROBALL IV and JUROGAM II γ-ray detector array, respectively. The level structure has been extended up to spin 49 / 2 and 33 new γ-rays have been added using triple-γ coincidence data. The spins and parities of the newly observed states have been confirmed by angular distribution ratios. In addition to the two known yrast bands based on a K = 5 / 2 configuration, a non-yrast band has been established up to spin 35 / 2 . This observation has brought to light a sharp backbending occuring at the highest spins promoting the 223 Th as the heavier thorium isotope having an accident observed in its moment of inertia at high spin. We interpret this new structure as based on the same configuration as the yrast band in 221 Th having dominant K = 1 / 2 contribution. At the highest spin a backbending occurs around a rotational frequency of ℏ ω = 0.23 MeV , very close to the one predicted in the 222 Th where a sharp transition to a reflection-symmetric shape is expected.