Статья

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>decay of excited states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>198</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Rn</mml:mi></mml:math>identified using correlated radioactive decay

Ros TaylorSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomS. J. FreemanSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomJohn DurellSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomM. J. LeddySchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomSimon RobinsonSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomB. J. VarleySchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomJ. F. C. CocksSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomK. HelariuttaSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomPeter G. JonesSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomR. JulinSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomS. JuutinenSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomH. KankaanpääSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomA. KantoSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomH. KettunenSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomP. KuusiniemiSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomM. LeinoDepartment of Physics University of Jyvaskyla Jyvaskyla FinlandM. MuikkuSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomP. RahkilaSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomA. SaveliusSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomP. T. GreenleesSchuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom

1999lv

ABI

Аннотация

The low-lying level structure of the neutron-deficient isotope ${}^{198}\mathrm{Rn}$ has been studied for the first time, using the ${}^{166}\mathrm{Er}{(}^{36}\mathrm{Ar},4n)$ reaction at a beam energy of 175 MeV. Evaporation residues were selected using an in-flight gas-filled separator, RITU, and implanted at the focal plane into a 16-element position-sensitive, passivated ion-implanted planar silicon detector. Prompt $\ensuremath{\gamma}$ rays in ${}^{198}\mathrm{Rn}$ were observed at the target position using the JUROSPHERE array of 24 Compton-suppressed germanium detectors, and were identified by the subsequent radioactive decay of associated recoiling ions in the silicon detector. Isotopic assignments of the nuclei produced were made on the basis of the energy and half-life of their $\ensuremath{\alpha}$ decay. The estimated production cross section for ${}^{198}\mathrm{Rn}$ in this reaction was 180 nb. The excitation energy of the ${2}_{1}^{+}$ state indicates inconsistency with theoretical predictions of large stable ground-state deformation in this isotope. The systematics of other low-lying excited states suggests the presence of deformed intruder states falling in energy with increasing neutron deficiency.

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Идентификаторы

DOI: 10.1103/physrevc.59.673

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Цитирований: 2Использованных источников: 0

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