High spin shell model states in the isotope Tc474390

D. Rudolph, C. J. Gross, M. K. Kabadiyski, K. P. Lieb, M. Weiszflog, H. Grawe, J. Heese, K.-H. Maier, and J. Eberth
Phys. Rev. C 47, 2574 – Published 1 June 1993
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Abstract

High spin states in the nucleus Tc90 have been identified for the first time via the fusion evaporation reaction Ni58(36Ar,3pn)90Tc, at 149 MeV beam energy. The OSIRIS spectrometer with an additional high purity Ge detector at 162° and several particle detectors were used to measure γγ and particle-γγ coincidences, directional correlations of oriented states (DCO’s), and line shapes due to Doppler-shift attenuation (DSA). Furthermore, an angular distribution experiment was performed with the reaction Ni58(35Cl,2pn)90Tc, at 120 MeV beam energy. Some 90 transitions were placed into a level scheme comprising 45 levels reaching up to a possible spin I=26ħ at 11.2 MeV excitation energy. Definite spin assignments for more than half of the levels were made via angular distribution coefficients and DCO ratios. Shell model calculations were performed in a restricted configuration space consisting of only the p1/2 and g9/2 orbitals. The level scheme can be reproduced very well up to spin I=21ħ. The predicted structure of the states is discussed and compared to those of neighboring isotopes.

  • Received 21 October 1992

DOI:https://doi.org/10.1103/PhysRevC.47.2574

©1993 American Physical Society

Authors & Affiliations

D. Rudolph, C. J. Gross, M. K. Kabadiyski, K. P. Lieb, and M. Weiszflog

  • II. Physikalisches Institut, Universität Göttingen, D-3400 Göttingen, Federal Republic of Germany

H. Grawe, J. Heese, and K.-H. Maier

  • Hahn-Meitner-Institut GmbH, D-1000 Berlin 39, Federal Republic of Germany

J. Eberth

  • Institut für Kernphysik der Universität zu Köln, D-5000 Köln 41, Federal Republic of Germany

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Vol. 47, Iss. 6 — June 1993

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