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Evidence for a High-Spin Beta-Decaying Isomer in Lu-177

Al-Garni, S D, Regan, P H, Walker, P M, Roeckl, E, Kirchner, R, Xu, F R, Batist, L, Blazhev, A, Borcea, R, Cullen, D M, Doring, J, El-Masri, H M, Narro, J G, Grawe, H, La Commara, M, Mazzoechi, C, Mukha, I, Pearson, C J, Plettner, C, Schmidt, K, Schmidt-Ott, W D, Shimbara, Y, Wheldon, C, Wood, R and Wooding, S C (2004) Evidence for a High-Spin Beta-Decaying Isomer in Lu-177 Physical Review C, 69 (2). ISSN 0556-2813

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Abstract

Nuclei in the A similar to 180 region have been populated and investigated in a series of multinucleon transfer and deep-inelastic reactions involving an 11.4 MeV per nucleon Xe-136 beam produced by the GSI UNILAC accelerator, impinging on a selection of tantalum and tungsten targets. The reaction products were released from a thermal ion source and subsequently mass selected using the GSI on-line mass separator. The unexpectedly high yield of gamma rays associated with the decay of the well established K-pi=37/2(-),t(1/2)=51.4 min isomer in Hf-177(72) and anomalous half-life characteristics associated with this decay lead to these data being interpreted as the beta(-) decay of a high-K isomer in the mother nucleus, Lu-177. By comparing the experimental findings with the predictions obtained from multi-quasiparticle blocked-BCS-Nilsson calculations, the proposed decay is suggested to be from a K-pi=39/2(-) five-quasiparticle state in Lu-177(71). A half-life of 7 +/- 2 min is determined for this beta-decay path which is estimated to have an excitation energy of approximate to3.9 MeV above the Lu-177 ground state.

Item Type: Article
Additional Information: Published in <i>Physical Review C,</i> Vol. 69, Iss. 2. Copyright American Physical Society. Click <a href=http://prc.aps.org/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:06
Last Modified: 23 Sep 2013 18:26
URI: http://epubs.surrey.ac.uk/id/eprint/188

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