γ decay of excited states in 198Rn identified using correlated radioactive decay
Taylor, R. B. E., Freeman, S. J., Durell, J. L., Leddy, M. J., Robinson, S. D., Varley, B. J., Cocks, J. F. C., Helariutta, K., Jones, P., Julin, R., Juutinen, S., Kankaanpää, H., Kanto, A., Kettunen, H., Kuusiniemi, P., Leino, M., Muikku, M., Rahkila, P., Savelius, A., & Greenlees, P. T. (1999). γ decay of excited states in 198Rn identified using correlated radioactive decay. Physical Review C : Nuclear Physics, 59(2), 673-681. https://doi.org/10.1103/PhysRevC.59.673
Published inPhysical Review C : Nuclear Physics
©1999 The American Physical Society
The low-lying level structure of the neutron-deficient isotope 198Rn has been studied for the first time, using the 166Er(36Ar,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 γ rays in 198Rn 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 α decay. The estimated production cross section for 198Rn 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. ...
PublisherAmerican Physical Society (APS)
ISSN Search the Publication Forum0556-2813
Publication in research information system
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Additional information about fundingThis work was supported by the U.K. Engineering and Physical Sciences Research Council (EPSRC), the Academy of Finland and by the Access to Large Scale Facility program under the Training and Mobility of Researchers program of the European Union. R.B.E.T. and S.D.R. acknowledge support of the EPSRC.
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