Prompt and delayed spectroscopy of Tb142 using recoil-isomer tagging

P. J R Mason, D. M. Cullen, C. Scholey, S. Eeckhaudt, T. Grahn, P. T. Greenlees, U. Jakobsson, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, A. M. Kishada, M. Leino, A. P. Leppänen, K. Mäntyniemi, P. Nieminen, M. Nyman, J. Pakarinen, P. Peura, P. RahkilaS. V. Rigby, J. Sarén, J. Sorri, J. Uusitalo, B. J. Varley, M. Venhart

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    Abstract

    Recoil-isomer tagging has been used to characterize the states built upon an Iπ=8+ isomer in Tb142. High-spin states of the neutron-deficient nucleus Tb142 were populated using an Fe54 beam, accelerated onto a Mo92 target of thickness ~500 μg/cm2 at energies of 245, 252, and 265 MeV using the K130 cyclotron at the University of Jyväskylä, Finland. Use of the JUROGAM target-position Ge-detector array coupled with the GREAT focal-plane spectrometer at the RITU gas-filled recoil separator has significantly increased the efficiency of the isomer-tagging technique. The rotational band built upon the Iπ=8+ isomeric state was established with isomer-tagged γ-γ coincidence data and angular distributions were measured for some of the more intensely populated states. Two previously unobserved bands that bypass the isomer were also established. The new data have been interpreted within the framework of the cranked-shell model. The data show good agreement with the calculated triaxial nuclear shape with γ=-30° for the Tb142m2 isomeric state. The B(M1)/B(E2) branching ratios, nuclear alignment, signature splitting, and reduced transition probability, B(E1), of the isomeric state have been systematically compared with those of the neighboring nuclei. These comparisons give further evidence for the πh11/2 νh11/2 configuration of the isomer. © 2009 The American Physical Society.
    Original languageEnglish
    Article number024318
    JournalPhysical Review C - Nuclear Physics
    Volume79
    Issue number2
    DOIs
    Publication statusPublished - 2 Feb 2009

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