Claes Fahlander
Professor emeritus
Low-lying states in 219Ra and 215Rn : Sampling microsecond α-decaying nuclei
Author
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
Full text
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