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

Såmark-Roth, A. LU ; Sarmiento, L. G. LU ; Rudolph, D. LU ; Ljungberg, J. LU ; Carlsson, B. G. LU ; Fahlander, C. LU ; Forsberg, U. LU ; Golubev, P. LU ; Ragnarsson, I. LU and Ackermann, D., et al. (2018) In Physical Review C 98(4).
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... (More)

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.

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Contribution to journal
publication status
published
subject
keywords
alpha decay, half life, gamma-ray spectroscopy, pulse shape analysis, nuclear shell model, Nilsson-Strutinsky calculations
in
Physical Review C
volume
98
issue
4
pages
11 pages
publisher
American Physical Society
external identifiers
  • scopus:85054748434
ISSN
2469-9985
DOI
10.1103/PhysRevC.98.044307
language
English
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yes
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a0027d1f-8ff3-4299-8fed-8268676f57b5
date added to LUP
2018-10-25 14:39:04
date last changed
2019-11-13 05:18:49
@article{a0027d1f-8ff3-4299-8fed-8268676f57b5,
  abstract     = {<p>Short-lived α-decaying nuclei "northeast" of <sup>208</sup>Pb in the chart of nuclides were studied using the reaction <sup>48</sup>Ca+<sup>243</sup>Am 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 <sup>220</sup>Ra and its odd-<i>A</i> neighbors, <sup>219</sup>Fr, and <sup>219,221</sup>Ra, with a focus on the <sup>219</sup>Ra→<sup>215</sup>Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of <sup>219</sup>Ra 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.</p>},
  articleno    = {044307},
  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, K. 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.},
  issn         = {2469-9985},
  keyword      = {alpha decay,half life,gamma-ray spectroscopy,pulse shape analysis,nuclear shell model,Nilsson-Strutinsky calculations},
  language     = {eng},
  month        = {10},
  number       = {4},
  pages        = {11},
  publisher    = {American Physical Society},
  series       = {Physical Review C},
  title        = {Low-lying states in <sup>219</sup>Ra and <sup>215</sup>Rn : Sampling microsecond α-decaying nuclei},
  url          = {http://dx.doi.org/10.1103/PhysRevC.98.044307},
  volume       = {98},
  year         = {2018},
}