Excited states in Te-139 and the properties of r-process nuclei with Z similar to 50 and N > 86

W Urban, W R Phillips, N Schulz, B J P Gall, I Ahmad, M Bentaleb, John Durell, M A Jones, M J Leddy, E Lubkiewicz, L R Morss, A G Smith, B J Varley

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Excited states in Te-139 were observed for the first time, using EUROGAM2 multidetector array to measure prompt-gamma radiation following the spontaneous fission of Cm-248. The systematic behavior of excitation energies in the N = 87 isotones and the multipolarity measurements suggest spin 7/2(-) for the ground state and 9/2(-) for the 271.0 keV level in Te-139. The 271.0 keV level most likely corresponds to the nu hg(9/2) single-particle excitation. A shape transition from spherical to prolate Te isotopes is observed at the neutron number N = 87, in accord with the Hartree-Fock plus BCS, PES calculations. Predictions for excitations in the Sn-137 nucleus are made based on the extended systematics obtained for the N = 87 isotones.
    Original languageEnglish
    JournalPhysical Review C
    Volume62
    Issue number4
    Publication statusPublished - 1 Oct 2000

    Fingerprint

    Dive into the research topics of 'Excited states in Te-139 and the properties of r-process nuclei with Z similar to 50 and N > 86'. Together they form a unique fingerprint.

    Cite this