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Alpha-decay spectroscopy of \(^{257}\)Rf

  • Regular Article - Experimental Physics
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Abstract

The decay properties of states in \(^{257}\)Rf have been investigated with the detector array GABRIELA at the FLNR, Dubna. The electromagnetic decay of a new excited state in \(^{253}\)No has been observed. The state lies 750 keV above the ground state and is favourably populated in the alpha decay from a low-lying isomeric state in \(^{257}\)Rf. It decays to the 9/2\(^-\) ground state by an M1 transition and is assigned the 11/2\(^-\)[725] Nilsson configuration. The presence of this state suggests a possible reinterpretation of the decay of the high-K isomer in \(^{253}\)No. Due to the favoured nature of the \(\alpha \)-decay the 11/2\(^-\)[725] Nilsson configuration is also assigned to the first excited state of \(^{257}\)Rf, lying at 74 keV.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data can be made available upon request from the GABRIELA collaboration.]

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Acknowledgements

This work was supported by the French National Research Agency (Project Nos. ANR-06-BLAN-0034-01 and ANR-12-BS05-0013), the IN2P3-JINR collaboration Agreement No. 04-63, the Russian Foundation for Basic Research (RFBR), Contracts No. 17-02-00867 and 18-52-15004, and by the Slovak Research and Development Agency (contract number APVV-18-0268). The authors thank the U400 cyclotron and ion-source operations staff for providing stable high intensity beams.

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Author notes

  1. R. Chakma

    Present address: GANIL, 14076, Caen Cedex 5, France

Authors and Affiliations

  1. JCLab, IN2P3-CNRS, Université Paris Saclay, 91405, Orsay, France

    K. Hauschild, A. Lopez-Martens & R. Chakma

  2. FLNR, JINR, Dubna, Russia

    M. L. Chelnokov, V. I. Chepigin, A. V. Isaev, I. N. Izosimov, D. E. Katrasev, A. A. Kuznetsova, O. N. Malyshev, A. G. Popeko, Yu. A. Popov, E. A. Sokol, A. I. Svirikhin, M. S. Tezekbayeva & A. V. Yeremin

  3. Dubna State University, Dubna, Russia

    O. N. Malyshev, A. G. Popeko, Yu. A. Popov, A. I. Svirikhin & A. V. Yeremin

  4. The Institute of Nuclear Physics, Almaty, 050032, Republic of Kazakhstan

    M. S. Tezekbayeva

  5. CNRS, IPHC UMR 7178, Université de Strasbourg, 67000, Strasbourg, France

    Z. Asfari, O. Dorvaux, B. J. P. Gall & K. Kessaci

  6. GANIL, 14076, Caen Cedex 5, France

    D. Ackermann & J. Piot

  7. Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, Bratislava, 84248, Slovakia

    P. Mosat & B. Andel

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Correspondence to K. Hauschild.

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Communicated by R. Janssens.

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Hauschild, K., Lopez-Martens, A., Chakma, R. et al. Alpha-decay spectroscopy of \(^{257}\)Rf. Eur. Phys. J. A 58, 6 (2022). https://doi.org/10.1140/epja/s10050-021-00657-8

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