Excited states in the neutron-deficient nuclei (197,199,201)Rn

K. Andgren*, B. Cederwall, J. Uusitalo, A. N. Andreyev, S. J. Freeman, P. T. Greenlees, B. Hadinia, U. Jakobsson, A. Johnson, P. M. Jones, D. T. Joss, S. Juuitinen, R. Julin, S. Ketelhut, A. Khaplanov, M. Leino, M. Nyman, R. D. Page, P. Rahkila, M. SandzeliusP. Sapple, J. Saren, C. Scholey, J. Simpson, J. Sorri, J. Thomson, R. Wyss

*Corresponding author for this work

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Excited states of the extremely neutron-deficient radon isotopes with N = 111, 113, 115 have been studied for the first time in a series of in-beam experiments performed at the Accelerator Laboratory of the University of Jyvaskyla. The reactions used were: (118)Sn((82)Kr, 3n)(197)Rn, (120)Sn((82)Kr, 3n)(199)Rn, (150)Sm((52)Cr, 3n)(199)Rn, and (122)Sn((82)Kr, 3n)(201)Rn. The gamma rays emitted from excited states in the different isotopes were identified using the recoil-alpha-decay tagging technique. The estimated cross section for the production of (197)Rn(m) was 7(3) nb, which is the lowest cross section reported so far for an in-beam study. The energies of the (17/2(+)) levels built on the isomeric (13/2(+)) states in (197,199,201)Rn indicate a transition from an anharmonic vibrational structure toward a rotational structure at low spins for these nuclei. However, the transition is not as sharp as predicted by theory.

Original languageEnglish
Article numberARTN 054303
Number of pages7
JournalPhysical Review C
Issue number5
Publication statusPublished - 2 May 2008


  • RN-198

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