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Low-lying structure of light radon isotopes

D J DobsonSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomS. J. FreemanNuclear PhysicsP. T. GreenleesDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandAhmad Nabi QadirSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomS. JuutinenDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandJohn DurellSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomT. EnqvistDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandPeter G. JonesDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandR. JulinDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandA. KeenanDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandH. KettunenDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandP. KuusiniemiDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandM. LeinoDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandP. NieminenDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandP. RahkilaDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandSimon RobinsonSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomJ. UusitaloDepartment of Physics, University of Jyväskylä, Jyväskylä, FinlandB. J. VarleySchuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom

Physical Review Cjournal2002en

ABI

Annotatsiya

The excited states in the neutron-deficient isotopes ${}^{200,202,204}\mathrm{Rn}$ have been populated using the ${}^{168}\mathrm{Er}{(}^{36}\mathrm{Ar},4n),{}^{166}\mathrm{Er}{(}^{40}\mathrm{Ar},4n),$ and ${}^{168}\mathrm{Er}{(}^{40}\mathrm{Ar},4n)$ reactions at beam energies of 175, 182, and 177 MeV, respectively. Evaporation residues were selected using an in-flight gas-filled separator and implanted at the focal plane into a 16-element position-sensitive, passivated ion-implanted planar silicon detector. Prompt $\ensuremath{\gamma}$ rays were observed at the target position using an array of Compton-suppressed germanium detectors. Correlation with the subsequent radioactive decay of associated recoiling ions in the silicon detector, recoil-$\ensuremath{\gamma}$ and recoil-$\ensuremath{\gamma}$-$\ensuremath{\gamma}$ coincidences were used to construct decay schemes of light radon isotopes. Measurements of delayed $\ensuremath{\gamma}$ rays at the focal plane have also been made, and microsecond isomers have been observed in ${}^{200,202}\mathrm{Rn},$ but not in ${}^{204}\mathrm{Rn}.$ Comparison of the results with those for polonium isotopes indicate a common mechanism for the onset of deformation. Candidates have been found in ${}^{202,204}\mathrm{Rn}$ for deformed intruder states which coexist with the spherical ground-state shape.

Mavzular

Nuclear physics research studies Nuclear Physics and Applications Nuclear reactor physics and engineering

Identifikatorlar

DOI: 10.1103/physrevc.66.064321

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