γ-ray spectroscopy of At197

K. Andgren, U. Jakobsson, B. Cederwall, J. Uusitalo, T. Bäck, S. J. Freeman, P. T. Greenlees, B. Hadinia, A. Hugues, A. Johnson, P. M. Jones, D. T. Joss, S. Juutinen, R. Julin, S. Ketelhut, A. Khaplanov, M. Leino, M. Nyman, R. D. Page, P. RahkilaM. Sandzelius, P. Sapple, J. Sarén, C. Scholey, J. Simpson, J. Sorri, J. Thomson, R. Wyss

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Excited states of the extremely neutron-deficient nucleus At197 have been studied in an in-beam experiment using the fusion-evaporation reaction Sn118(Kr82,p2n)At197. γ rays belonging to At197 feeding the Iπ=(9/2-) ground state, as well as γ rays feeding the 311-keV Iπ=(13/2+) isomer, decaying via the emission of γ rays, and the 52-keV Iπ=(1/2+) α-decaying isomer have been identified using the recoil-α-decay tagging technique. Total Routhian surface calculations predict a near-spherical shape for the (9/2-) ground state and oblate shapes with β2 around -0.2 for the (1/2+) and the (13/2+) states. These predictions agree with our experimental findings. © 2008 The American Physical Society.
    Original languageEnglish
    Article number044328
    JournalPhysical Review C - Nuclear Physics
    Volume78
    Issue number4
    DOIs
    Publication statusPublished - 27 Oct 2008

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