Decay studies of new isomeric states in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>No</mi><mprescripts></mprescripts><none></none><mn>255</mn></mmultiscripts></math>

A. Bronis; F. P. Heßberger; S. Antalic; B. Andel; D. Ackermann; S. Heinz; S. Hofmann; J. Khuyagbaatar; B. Kindler; I. Kojouharov; P. Kuusiniemi; M. Leino; B. Lommel; R. Mann; K. Nishio; A. G. Popeko; B. Streicher; B. Sulignano; J. Uusitalo; M. Venhart; A. V. Yeremin

doi:10.1103/PhysRevC.106.014602

Decay studies of new isomeric states in ${}^{255}{No}$

A. Bronis ^1,*, F. P. Heßberger ^2,3, S. Antalic ¹, B. Andel ¹, D. Ackermann ⁴, S. Heinz², S. Hofmann², J. Khuyagbaatar^2,3, B. Kindler ² et al.

I. Kojouharov², P. Kuusiniemi ⁵, M. Leino ⁵, B. Lommel ², R. Mann², K. Nishio ⁶, A. G. Popeko ⁷, B. Streicher², B. Sulignano ⁸, J. Uusitalo⁵, M. Venhart ⁹, and A. V. Yeremin ⁷

¹Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, Slovakia
²GSI Helmholtzzentrum für Schwerionenforschung, GmbH, 64291 Darmstadt, Germany
³Helmholtz Institut Mainz, Johann-Joachim-Becherweg, 55128 Mainz, Germany
⁴GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France
⁵Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
⁶Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan
⁷Joint Institute for Nuclear Research, 141980 Dubna, Russia
⁸Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
⁹Institute of Physics, Slovak Academy of Sciences, 84511 Bratislava, Slovakia

^*adam.bronis@fmph.uniba.sk

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Phys. Rev. C 106, 014602 – Published 5 July, 2022

DOI: https://doi.org/10.1103/PhysRevC.106.014602

Abstract

The decay of excited states in ${}^{255}{No}$ was investigated by applying the evaporation-residue–conversion-electron correlation technique. Two new isomeric states were observed in ${}^{255}{No}$ together with the previously known one. Excitation energies of the isomeric states were estimated based on the energies of conversion electrons and $γ$ rays from correlation chains. These results were in accord with theoretical calculations based on the mean-field models. A tentative decay scheme of isomeric states in ${}^{255}{No}$ is proposed, and their Nilsson configurations are discussed. The energy decrease of the $11 / 2^{-}$ [725] Nilsson level for heavy $N = 153$ isotones as a function of increasing proton number is confirmed.

Physical Review C

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Decay studies of new isomeric states in ${}^{255}{No}$

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Decay studies of new isomeric states in No255

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Decay studies of new isomeric states in ${}^{255}{No}$