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Experimental evidence for low-lying quadrupole isovector excitation of \(^{208}\)Po

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Abstract

We present the results from an experiment dedicated to measure the lifetime of the \(2^+_2\) state, candidate for the one-phonon mixed-symmetry state, of \(^{208}\)Po. This nucleus was studied in the \(\alpha \)-transfer reaction \(^{204}\)Pb(\(^{12}\)C,\(^{8}\)Be)\(^{208}\)Po and the lifetime of the \(2^+_2\) state was determined by utilizing the Doppler-shift attenuation method. The experimental data show that the \(2^+_2\) state decays with a sizable M1 transition to the \(2^+_1\) state revealing its isovector nature.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All the relevant data supporting the findings of the present study are given in the paper. Additional data can be provided by the corresponding author on reasonable request.]

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Acknowledgements

A.Y. acknowledges the support by GSI Helmholtzzentrum under grant KJOLIE1820. D.K. acknowledges the support by the Bulgarian Ministry of Education and Science under the National Research Program “Young scientists and post-doctoral students”. This work was supported by the BgNSF under grant KP-06-M28/1 (08/12/2018) and by DAAD unter the partnership agreement between the University of Cologne and University of Sofia. The UWS group acknowledges financial support by the UK-STFC. The work was funded by BMBF Grant Nos. 05P19RDFN1, 05P18RDFN1, 05P19RDFN9, 05P18RDFN9, 05P19RDFN9, 05P18RDCIA, and DFG Grant SFB 1245.

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Authors and Affiliations

  1. Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164, Sofia, Bulgaria

    A. Yaneva, D. Kocheva, G. Rainovski, M. Djongolov, K. A. Gladnishki, D. Kalaydjieva & M. Stoyanova

  2. Institut für Kernphysik, Universität zu Köln, 50937, Cologne, Germany

    A. Yaneva, J. Jolie, A. Blazhev, A. Dewald, C. Fransen, V. Karayonchev & C. Müller-Gatermann

  3. Institut für Kernphysik, Technische Universität Darmstadt, 64289, Darmstadt, Germany

    N. Pietralla, C. Henrich, I. Homm, K. E. Ide, P. R. John, R. Kern, J. Kleemann, Th. Kröll & V. Werner

  4. Argonne National Laboratory, 9700 South Cass Ave, Argonne, IL, 60439, USA

    C. Müller-Gatermann

  5. CEPS, University of the West of Scotland, PA1 2BE Paisley, UK and SUPA, Glasgow, G12 8QQ, UK

    M. Scheck & P. Spagnoletti

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  1. A. Yaneva
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  2. D. Kocheva
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  23. M. Stoyanova
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Corresponding author

Correspondence to D. Kocheva.

Additional information

Communicated by Wolfram Korten

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Yaneva, A., Kocheva, D., Rainovski, G. et al. Experimental evidence for low-lying quadrupole isovector excitation of \(^{208}\)Po. Eur. Phys. J. A 56, 246 (2020). https://doi.org/10.1140/epja/s10050-020-00259-w

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  • DOI: https://doi.org/10.1140/epja/s10050-020-00259-w

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