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Isomer and Decay Studies in Neutron-Rich A 180 Nuclei

By S. D. Al-garni, P. H. Regan, P. M. Walker, H. M. El-masri, J. Garces Narro, C. J. Pearson, E. Roeckl, R. Kirchner, M. La Commara, C. Mazzocchi, H. Grawe, R. Borcea, J. Doring, S. C. Wooding, K. Schmidt, D. M. Cullen, C. Wheldon, W. D. Schmidt-ott, R. Wood, L. Batist, I. Mukha, C. Plettner, A. Blazhev and Y. Shimbara

Abstract

Deep-inelastic collisions of 136Xe ions with tantalum and tungsten targets have been used to study-decays and high-spin isomers in neutron-rich A 180 nuclei at the GSI on-line mass separator. Reaction products were extracted from the thermal ion source (TIS), accelerated to 55 keV, mass separated with a dipole magnet, and transported to a = counting station. The implanted activity was periodically removed, with periods 160 s, 1600 s and 16000 s. Electron-gamma coincident events were written to magnetic tape in list mode, so that they could be analysed with respect to the half-lives invloved. Gamma-rays associated with the decay of the well known K = 37; 177, 51.4 min isomer in Hf were observed 2 with an unexpectedly high yield as shown in Fig. 1. Atwo component grow-in analysis for the observed decays from the K = 37; 177 isomer in Hf gives a rst com-2 ponent of6 +

Year: 2011
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