First Observation of the Nuclei 87Tc and 88Tc

Dirk Rudolph, E. Cristancho, C. J. Gross, A. Jungclaus, K. P. Lieb, M. A. Bentley, W. Gelletly, J. Simpson, H. Grawe, J. Heese, K. H. Maier, J. Eberth, S. Skoda, J. L. Durell, B. J. Varley, D. J. Blumenthal, C. J. Lister, S. Rastikerdar

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    The gamma-decay of excited states in the neutron deficient isotopes Tc-87 and Tc-88 has been observed for the first time. The fusion-evaporation reactions Ni-58(S-32, p2n)Tc-87 and Ni-58(S-32, pn)Tc-88 at 110 MeV, Ca-40(Cr-50, p2n)Tc-87 and Ca-40(Cr-50, pn)Tc-88 at 170 MeV and Ni-58(Ar-36, alpha-pn)Tc-88 at 145 MeV beam energy were used. Unambiguous identification of these nuclei which are populated with less than 1 mb cross section was achieved with coincidences between the gamma-radiation and the evaporation residues detected in a recoil mass separator. From gamma-gamma-coincidence data, a decay scheme of 11 transitions was constructed for Tc-88, the ground state of which is suggested to have I-pi = 7- or 8+. Two transitions identified in Tc-87 follow the pattern of a g9/2 one-quasiparticle band.
    Original languageEnglish
    Pages (from-to)L113-L119
    JournalJournal of Physics G: Nuclear and Particle Physics
    Issue number7
    Publication statusPublished - 1991

    Bibliographical note


    Subject classification (UKÄ)

    • Subatomic Physics


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