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Alpha-decay studies of the new isotopes 191At and 193At

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Abstract.

Detailed alpha-decay studies have been performed for the neutron-deficient isotopes 191At and 193At. The nuclei were produced in fusion-evaporation reactions of 54Fe and 56Fe ions with a 141Pr target. The fusion products were separated in-flight using a gas-filled recoil separator and implanted into a position-sensitive silicon detector. The isotopes were identified using position, time and energy correlations between the implants and subsequent alpha-decays. Three alpha-decaying states were identified for 193At and two for 191At. The spin and parity of the initial states in the astatine isotopes were deduced based on unhindered alpha-decays to states in the bismuth daughter nuclei. In both astatine isotopes the 1/2+ intruder state was determined to be the ground state and a 7/2- state to be the first-excited state. In 193At the alpha-decay of the 13/2+ state was observed in coincidence with a previously known gamma-ray transition from the 13/2+ state in the corresponding daughter nucleus 189Bi. In 187Bi and 189Bi low-lying 7/2- states were observed for the first time via alpha-decay of the mother nuclei.

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  1. Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40014, Jyväskylä, Finland

    H. Kettunen, T. Enqvist, T. Grahn, P.T. Greenlees, P. Jones, R. Julin, S. Juutinen, A. Keenan, P. Kuusiniemi, M. Leino, A.-P. Leppänen, P. Nieminen, J. Pakarinen, P. Rahkila & J. Uusitalo

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Communicated by C. Signorini

Received: 16 December 2002, Revised: 26 March 2003, Published online: 4 August 2003

PACS:

23.60.+e Alpha decay - 27.80.+w \(190 \leq A \leq 219\) - 23.20.Lv \(\gamma\) transitions and level energies - 21.10.Dr Binding energies and masses

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Kettunen, H., Enqvist, T., Grahn, T. et al. Alpha-decay studies of the new isotopes 191At and 193At. Eur. Phys. J. A 17, 537–558 (2003). https://doi.org/10.1140/epja/i2002-10162-1

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