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

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. Here, the 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 221,219Ra, 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.

Authors:
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  1. Lund Univ., Lund (Sweden)
  2. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); GANIL, Caen (France)
  3. Helmholtz Inst. Mainz, Mainz (Germany)
  4. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Helmholtz Inst. Mainz, Mainz (Germany); Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
  5. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
  6. Univ. of Liverpool, Liverpool (United Kingdom); Lund Univ., Lund (Sweden)
  7. Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
  8. Helmholtz Inst. Mainz, Mainz (Germany); Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
  9. Helmholtz Inst. Mainz, Mainz (Germany); Groningen, Groningen (Netherlands)
  10. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  11. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  12. Univ. of Liverpool, Liverpool (United Kingdom)
  13. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Helmholtz Inst. Mainz, Mainz (Germany)
  14. Univ. of Liverpool, Liverpool (United Kingdom); Helmholtz Inst. Mainz, Mainz (Germany)
  15. Univ. of Oslo, Oslo (Norway)
  16. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
  17. Paul Scherrer Inst. and Univ. of Bern, Villigen (Switzerland)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1571859
Alternate Identifier(s):
OSTI ID: 1477543
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Såmark-Roth, A., Sarmiento, L. G., Rudolph, D., Ljungberg, J., Carlsson, B. G., Fahlander, C., Forsberg, U., Golubev, P., Ragnarsson, I., Ackermann, D., Andersson, L. -L., Block, M., Brand, H., Cox, D. M., Di Nitto, A., Düllmann, Ch. E., Eberhardt, K., Even, J., Gates, J. M., Gerl, J., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Heßberger, F. P., Jäger, E., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, Krzysztof, Schädel, M., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Trautmann, N., Torres, T., Türler, A., Ward, A., Wiehl, N., and Yakushev, A. Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.044307.
Såmark-Roth, A., Sarmiento, L. G., Rudolph, D., Ljungberg, J., Carlsson, B. G., Fahlander, C., Forsberg, U., Golubev, P., Ragnarsson, I., Ackermann, D., Andersson, L. -L., Block, M., Brand, H., Cox, D. M., Di Nitto, A., Düllmann, Ch. E., Eberhardt, K., Even, J., Gates, J. M., Gerl, J., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Heßberger, F. P., Jäger, E., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, Krzysztof, Schädel, M., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Trautmann, N., Torres, T., Türler, A., Ward, A., Wiehl, N., & Yakushev, A. Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei. United States. doi:10.1103/PhysRevC.98.044307.
Såmark-Roth, A., Sarmiento, L. G., Rudolph, D., Ljungberg, J., Carlsson, B. G., Fahlander, C., Forsberg, U., Golubev, P., Ragnarsson, I., Ackermann, D., Andersson, L. -L., Block, M., Brand, H., Cox, D. M., Di Nitto, A., Düllmann, Ch. E., Eberhardt, K., Even, J., Gates, J. M., Gerl, J., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Heßberger, F. P., Jäger, E., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, Krzysztof, Schädel, M., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Trautmann, N., Torres, T., Türler, A., Ward, A., Wiehl, N., and Yakushev, A. Tue . "Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei". United States. doi:10.1103/PhysRevC.98.044307. https://www.osti.gov/servlets/purl/1571859.
@article{osti_1571859,
title = {Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei},
author = {Såmark-Roth, A. and Sarmiento, L. G. and Rudolph, D. and Ljungberg, J. and Carlsson, B. G. and Fahlander, C. and Forsberg, U. and Golubev, P. and Ragnarsson, I. and Ackermann, D. and Andersson, L. -L. and Block, M. and Brand, H. and Cox, D. M. and Di Nitto, A. and Düllmann, Ch. E. and Eberhardt, K. and Even, J. and Gates, J. M. and Gerl, J. and Gregorich, K. E. and Gross, C. J. and Herzberg, R. -D. and Heßberger, F. P. and Jäger, E. and Khuyagbaatar, J. and Kindler, B. and Kojouharov, I. and Kratz, J. V. and Krier, J. and Kurz, N. and Lommel, B. and Mistry, A. and Mokry, C. and Omtvedt, J. P. and Papadakis, P. and Runke, J. and Rykaczewski, Krzysztof and Schädel, M. and Schaffner, H. and Schausten, B. and Thörle-Pospiech, P. and Trautmann, N. and Torres, T. and Türler, A. and Ward, A. and Wiehl, N. and Yakushev, A.},
abstractNote = {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. Here, the 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 221,219Ra, 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.},
doi = {10.1103/PhysRevC.98.044307},
journal = {Physical Review C},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

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