γ-ray spectroscopy of At197

K. Andgren et al.
Phys. Rev. C 78, 044328 – Published 27 October 2008

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.

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  • Received 25 April 2008

DOI:https://doi.org/10.1103/PhysRevC.78.044328

©2008 American Physical Society

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Vol. 78, Iss. 4 — October 2008

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