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

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
  • D. Ackermann
  • L. L. Andersson
  • M. Block
  • H. Brand
  • A. Di Nitto
  • Ch E. Düllmann
  • K. Eberhardt
  • J. Even
  • J. M. Gates
  • J. Gerl
  • K. 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
Organisations
External organisations
  • GSI Helmholtz Centre for Heavy Ion Research
  • GANIL Grand Accelerateur National d'Ions Lourds
  • Helmholtz Institute Mainz
  • University of Mainz
  • University of Liverpool
  • Lawrence Berkeley National Laboratory
  • Oak Ridge National Laboratory
  • University of Oslo
  • University of Bern
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics

Keywords

  • alpha decay, half life, gamma-ray spectroscopy, pulse shape analysis, nuclear shell model, Nilsson-Strutinsky calculations
Original languageEnglish
Article number044307
Number of pages11
JournalPhysical Review C
Volume98
Issue number4
Publication statusPublished - 2018 Oct 9
Publication categoryResearch
Peer-reviewedYes

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Related research output

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 othersKrier, J., Kurz, N., Lommel, B., Maiti, M., Minami, S., Mistry, A. K., Mrosek, C. M., Pysmenetska, I., Dirk Rudolph, Luis Sarmiento, 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 journalArticle

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 othersBrand, H., Gillis Carlsson, Cox, D., Derkx, X., Eberhardt, K., Even, J., Claes Fahlander, 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., Ingemar Ragnarsson, 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.

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Related activities

Såmark-Roth, A. (Speaker)
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Activity: Talk or presentationPresentation

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