Properties of 187Ta Revealed through Isomeric Decay

Mass-separated 187Ta114 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. Here, internal $γ$ rays revealed a $T$1/2 = 7.3±0.9 s isomer at 1778±1 keV, which decays through a rotational ban...

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Bibliographic Details
Published in:Physical review letters 2020-11, Vol.125 (19)
Main Authors: Walker, P. M., Hirayama, Y., Lane, G. J., Watanabe, H., Dracoulis, G. D., Ahmed, M., Brunet, M., Hashimoto, T., Ishizawa, S., Kondev, F. G., Litvinov, Yu. A., Miyatake, H., Moon, J. Y., Mukai, M., Niwase, T., Park, J. H., Podolyák, Zs, Rosenbusch, M., Schury, P., Wada, M., Watanabe, X.  Y., Liang, W. Y., Xu, F. R.
Format: Article
Language:English
Subjects:
NUCLEAR PHYSICS AND RADIATION PHYSICS
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Summary:Mass-separated 187Ta114 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. Here, internal $γ$ rays revealed a $T$1/2 = 7.3±0.9 s isomer at 1778±1 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 $E$2 hindrance factor, $f$$ν$ = 27±1, supports the interpretation that axial symmetry is approximately conserved.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.125.192505