Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying nuclei
| Autor: | Alexander Yakushev, Ingemar Ragnarsson, N. Kurz, Julia Even, K. P. Rykaczewski, T. Torres, Carl J Gross, I. Kojouharov, Andreas Türler, R.-D. Herzberg, Dirk Rudolph, J. P. Omtvedt, Jörg Runke, B. Schausten, Luis Sarmiento, J. Krier, F. P. Heßberger, Pavel Golubev, Ch. E. Düllmann, J. M. Gates, Birgit Kindler, L.-L. Andersson, Michael Block, J. V. Kratz, B. G. Carlsson, Norbert Wiehl, Bettina Lommel, Klaus Eberhardt, Dieter Ackermann, Petra Thörle-Pospiech, Norbert Trautmann, Egon Jäger, H. Schaffner, Claes Fahlander, Kenneth E. Gregorich, J. Gerl, Matthias Schädel, A. Di Nitto, A. Ward, U. Forsberg, C. Mokry, J Ljungberg, A. Såmark-Roth, Philippos Papadakis, H. Brand, A. K. Mistry, Jadambaa Khuyagbaatar, Daniel Cox |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physical Review C. 98 |
| ISSN: | 2469-9993 2469-9985 |
| DOI: | 10.1103/physrevc.98.044307 |
| Popis: | 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. (Less) |
| Databáze: | OpenAIRE |
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