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\(\alpha\)-decay spectroscopy of light odd-odd Bi isotopes - II: 186Bi and the new nuclide 184Bi

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Abstract.

Alpha-decay of the new nuclide 184Bi has been studied in the complete-fusion reaction 93Nb(94Mo, 3n)184Bi at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of recoil-\(\alpha\), recoil-\(\alpha\)-\(\gamma\) analysis and excitation functions measurements. Two \(\alpha\)-decaying isomeric states in 184Bi with half-life values of 13(2) ms and 6.6(1.5) ms were identified. The \(\alpha\)-branching ratio of 180Tl was deduced for the first time as \(b_\alpha = (2 --12)\%\). Improved data on the fine-structure \(\alpha\)-decay of 186Bi were obtained in the 93Nb(95Mo, 2n)186Bi reaction. A similarity of the decay energies and half-life values of 184,186Bi is pointed out and a possible explanation for this effect is suggested.

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Correspondence to A. N. Andreyev.

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Communicated by J. Äystö

Received: 14 March 2003, Revised: 29 April 2003, Published online: 2 September 2003

PACS:

23.60.+e \(\alpha\) decay - 27.70.+q \(150 \leq A \leq 189\) - 27.80.+w \(190 \leq A \leq 219\)

K. Heyde: Present address: EP-ISOLDE, CERN, CH-1211, Geneva 23, Switzerland.

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Andreyev, A.N., Ackermann, D., Heßberger, F.P. et al. \(\alpha\)-decay spectroscopy of light odd-odd Bi isotopes - II: 186Bi and the new nuclide 184Bi. Eur. Phys. J. A 18, 55–64 (2003). https://doi.org/10.1140/epja/i2003-10051-1

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