Properties of 187Ta revealed through isomeric decay
P.M. Walker, Y. Hirayama, G.J. Lane, H. Watanabe, G.D. Dracoulis, M., Ahmed, M. Brunet, T. Hashimoto, S. Ishizawa, F.G. Kondev, Yu.A. Litvinov, H., Miyatake, J.Y. Moon, M. Mukai, T. Niwase, J.H. Park, Zs. Podolyak, M., Rosenbusch, P. Schury, M. Wada, X.Y. Watanabe, W.Y. Liang
TL;DR
This study reports the first production of high-spin isomeric 187Ta via multi-nucleon transfer, revealing decay properties and shape transition behaviors with implications for nuclear structure models.
Contribution
First-time production and detailed decay analysis of 187Ta isomer, providing insights into nuclear shape transitions and model comparisons in this mass region.
Findings
Identified a 7.3 s isomer at 1778 keV in 187Ta
Observed perturbations in the rotational band near shape transition
Model calculations suggest limited triaxiality influence
Abstract
Mass-separated 187Ta in a high-spin isomeric state has been produced for the first time by multi-nucleon transfer reactions, employing an argon gas stopping cell and laser ionisation. Internal gamma rays revealed a 7.3 s isomer at 1778 keV, which decays through a rotational band with perturbations associated with the approach to a prolate-oblate shape transition. Model calculations show less influence from triaxiality compared to heavier elements in the same mass region. The isomer decay reduced E2 hindrance factor of 27 supports the interpretation that axial symmetry is approximately conserved.
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