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First observation of high-K isomeric states in \(^{249}\)Md and \(^{251}\)Md

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Abstract

Decay spectroscopy of the odd-proton nuclei \(^{249}\)Md and \(^{251}\)Md has been performed. High-K isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. An isomeric state with a half-life of 2.8(5) ms and an excitation energy \(\ge 910\) keV was found in \(^{249}\)Md. In \(^{251}\)Md, an isomeric state with a half-life of 1.4(3) s and an excitation energy \(\ge 844\) keV was found. Similarly to the neighbouring \(^{255}\)Lr, these two isomeric states are interpreted as 3 quasi-particle high-K states and compared to new theoretical calculations. Excited nuclear configurations were calculated within two scenarios: via blocking nuclear states located in proximity to the Fermi surface or/and using the quasiparticle Bardeen–Cooper–Schrieffer method. Relevant states were selected on the basis of the microscopic-macroscopic model with a deformed Woods–Saxon potential. The most probable candidates for the configurations of K-isomeric states in Md nuclei are proposed.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Access to the raw binary data may be provided upon request.].

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Acknowledgements

We acknowledge the accelerator staff at the University of Jyväskylä for delivering a high-quality beam during the experiments. Support has been provided by the EU 7th Framework Programme “Integrating Activities - Transnational Access” Project no. 262010 (ENSAR), by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL; contract 213503), and by the UK STFC. A. H. would like to thank the Slovak Research and Development Agency under contract no. APVV-15-0225, and Slovak grant agency VEGA (contract no. 2/0067/21). This work was also supported by the Research and Development Operational Programme funded by the European Regional Development Fund, project no. ITMS code 26210120023, We thank the European Gamma-Ray Spectroscopy pool (Gammapool) for the loan of the germanium detectors used in the SAGE array. M. K. was co-financed by the National Science Centre under Contract no. UMO-2013/08/M/ST2/00257 (LEA COPIGAL).

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Author notes

  1. H. Badran & J. Sorri

    Present address: Radiation and Nuclear Safety Authority-STUK, Laippatie 4, 00880, Helsinki, Finland

  2. D. Cox

    Present address: University of Lund, Box 118, 221 00, Lund, Sweden

  3. U. Jakobsson

    Present address: Laboratory of Radiochemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, 00014, Helsinki, Finland

  4. J. Konki

    Present address: CERN, 1211, Geneva 23, Switzerland

  5. A. Mistry

    Present address: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany

  6. P. Nieminen

    Present address: Fortum, Power Division, P.O. Box 100, 00048, Fortum, Finland

  7. P. Papadakis

    Present address: STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK

  8. P. Peura

    Present address: International Atomic Energy Agency, Vienna, Austria

  9. S. Stolze

    Present address: Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA

Authors and Affiliations

  1. Irfu, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France

    T. Goigoux, Ch. Theisen, B. Sulignano, M. Airiau, R. Briselet, F. Déchery, A. Drouart, Z. Favier, E. Rey-Herme, M. Vandebrouck & M. Zielińska

  2. Department of Physics, University of Jyvaskyla, P.O. Box 35, 40014, Jyvaskyla, Finland

    K. Auranen, H. Badran, T. Calverley, D. Cox, F. Defranchi Bisso, T. Grahn, P. T. Greenlees, A. Herzáň, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Leino, A. Lightfoot, P. Nieminen, J. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, S. Stolze & J. Uusitalo

  3. Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK

    T. Calverley, D. Cox, R.-D. Herzberg, A. Mistry, P. Papadakis & A. Ward

  4. Institut Pluridisciplinaire Hubert Curien, 67037, Strasbourg, France

    F. Déchery, B. Gall & J. Rubert

  5. IJCLab, IN2P3-CNRS, Orsay Campus, 91405, Orsay, France

    K. Hauschild & A. Lopez-Martens

  6. Institute of Physics, Slovak Academy of Sciences, 84511, Bratislava, Slovakia

    A. Herzáň

  7. Institute of Physics, University of Zielona Góra, Z. Szafrana 4a, 65-516, Zielona Gora, Poland

    P. Jachimowicz

  8. National Centre for Nuclear Research, Pasteura 7, 02-093, Warsaw, Poland

    M. Kowal & J. Skalski

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Corresponding author

Correspondence to Ch. Theisen.

Additional information

Communicated by Navin Alahari.

J. Rubert: Deceased.

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Goigoux, T., Theisen, C., Sulignano, B. et al. First observation of high-K isomeric states in \(^{249}\)Md and \(^{251}\)Md. Eur. Phys. J. A 57, 321 (2021). https://doi.org/10.1140/epja/s10050-021-00631-4

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