Low-lying states in 219Ra and 215Rn: Sampling microsecond α-decaying nuclei

A. Såmark-Roth, L. G. Sarmiento, D. Rudolph, J. Ljungberg, B. G. Carlsson, C. Fahlander, U. Forsberg, P. Golubev, I. Ragnarsson, D. Ackermann, L. L. Andersson, M. Block, H. Brand, D. M. Cox, A. Di Nitto, Ch E. Düllmann, K. Eberhardt, J. Even, J. M. Gates, J. GerlK. E. Gregorich, C. J. Gross, R. D. Herzberg, F. P. Heßberger, E. Jäger, J. Khuyagbaatar, B. Kindler, I. Kojouharov, J. V. Kratz, J. Krier, N. Kurz, B. Lommel, A. Mistry, C. Mokry, J. P. Omtvedt, P. Papadakis, J. Runke, K. Rykaczewski, M. Schädel, H. Schaffner, B. Schausten, P. Thörle-Pospiech, N. Trautmann, T. Torres, A. Türler, A. Ward, N. Wiehl, A. Yakushev

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Short-lived α-decaying nuclei "northeast" of 208Pb in the chart of nuclides were studied using the reaction 48Ca+243Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220Ra and its odd-A neighbors, 219Fr, and 219,221Ra, with a focus on the 219Ra→215Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of 219Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.

Original languageEnglish
Article number044307
Number of pages11
JournalPhysical Review C
Issue number4
Publication statusPublished - 2018 Oct 9

Subject classification (UKÄ)

  • Subatomic Physics


  • alpha decay
  • half life
  • gamma-ray spectroscopy
  • pulse shape analysis
  • nuclear shell model
  • Nilsson-Strutinsky calculations


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  • Spectroscopy along Decay Chains of Element 114, Flerovium

    Såmark-Roth, A., 2021, Lund: Lund University. 227 p.

    Research output: ThesisDoctoral Thesis (compilation)

    Open Access
  • New Short-Lived Isotope 221U and the Mass Surface Near N=126

    Khuyagbaatar, J., Yakushev, A., Düllmann, C. E., Ackermann, D., Andersson, L-L., Block, M., Brand, H., Cox, D. M., Even, J., Forsberg, U., Golubev, P., Hartmann, W., Herzberg, R-D., Heßberger, F. P., Hoffmann, J., Hübner, A., Jäger, E., Jeppsson, J., Kindler, B., Kratz, J. V. & 19 others, Krier, J., Kurz, N., Lommel, B., Maiti, M., Minami, S., Mistry, A. K., Mrosek, C. M., Pysmenetska, I., Rudolph, D., Sarmiento, L., Schaffner, H., Schädel, M., Schausten, B., Steiner, J., De Heidenreich, T. T., Uusitalo, J., Wegrzecki, M., Wiehl, N. & Yakusheva, V., 2015, In: Physical Review Letters. 115, 24, 4 p., 242502.

    Research output: Contribution to journalArticlepeer-review

    61 Citations (SciVal)
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  • Spectroscopy of Element 115 Decay Chains

    Rudolph, D., Forsberg, U., Golubev, P., Sarmiento, L., Yakushev, A., Andersson, L-L., Di Nitto, A., Düllmann, C. E., Gates, J. M., Gregorich, K. E., Gross, C. J., Heßberger, F. P., Herzberg, R-D., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schädel, M., Åberg, S., Ackermann, D., Block, M. & 31 others, Brand, H., Carlsson, G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D. & Wiehl, N., 2013, In: Physical Review Letters. 111, 11, 112502.

    Research output: Contribution to journalArticlepeer-review

    114 Citations (SciVal)
    319 Downloads (Pure)

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