Assignment of levels in ²⁰⁸Fr and 10⁻ isomers in the odd-odd isotones ²⁰⁶At and ²⁰⁸Fr

Date

2009

Authors

Dracoulis, G. D.
Davidson, P. M.
Lane, G. J.
Byrne, A. P.
Kibédi, T.
Nieminen, P.
Wilson, A. N.
Watanabe, H.

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Volume Title

Publisher

EDP Sciences

Abstract

Excited states in ²⁰⁸Fr have been identified using the ¹⁹⁷Au(16O, 5n)²⁰⁸Fr reaction and a variety of time-correlated γγ -ray and conversion electron spectroscopic techniques. Transitions above and below a ττ = 623(16) ns 10- isomer are placed in the level scheme. This isomer is analogous to that observed in the odd-odd isotone ²⁰⁶At for which additional spectroscopic information is also obtained, including a precise lifetime of ττ = 1173(30) ns. The γγ -rays assigned to ²⁰⁸Fr are the same as the main transitions erroneously assigned to ²⁰⁹Fr in previous work.

Description

Keywords

21.10.Tg Lifetimes, widths, 23.20.Lv γγ transitions and level energies, 23.35.+g Isomer decay, 27.80.+w 190 ≤≤ A ≤≤ 219

Citation

Source

The European Physical Journal A

Type

Journal article

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