Evidence for Spherical-Oblate Shape Coexistence in 87Tc

Liu, X. and Cederwall, B. and Qi, C. and Wyss, R. A. and Aktas, Ö. and Kuti, I. and Nyakó, B. M. and Sohler, D. and Tímár, J. (2022) Evidence for Spherical-Oblate Shape Coexistence in 87Tc. PHYSICAL REVIEW C, 106 (3). No.-034304. ISSN 2469-9985 (print); 2469-9993 (online)

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Abstract

Excited states in the neutron-deficient nucleus Tc-87 have been studied via the fusion-evaporation reaction 54Fe(36Ar, 2n1p) Tc-87 at 115 MeV beam energy. The AGATA gamma-ray spectrometer coupled to the DIAMANT, NEDA, and Neutron Wall detector arrays for light-particle detection was used to measure the prompt coincidence of gamma rays and light particles. Six transitions from the deexcitation of excited states belonging to a new band in Tc-87 were identified by comparing gamma-ray intensities in the spectra gated under different reaction channel selection conditions. The constructed level structure was compared with the shell model and total Routhian surface calculations. The results indicate that the new band structure in 87Tc is built on a spherical configuration, which is different from that assigned to the previously identified oblate yrast rotational band.

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