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Claes Fahlander

Professor emeritus

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

Author

  • 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. 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
Show all

Summary, in English

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.

Department/s

  • Nuclear physics
  • Mathematical Physics

Publishing year

2018-10-09

Language

English

Publication/Series

Physical Review C

Volume

98

Issue

4

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

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

Status

Published

Project

  • Spectroscopy along Decay Chains of Element 114, Flerovium
  • Characterization of New Superheavy Elements
  • Nuclear Structure at the Limits: Isotope-selective Spectroscopy

ISBN/ISSN/Other

  • ISSN: 2469-9985