Extending the low-<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Z</mi></math> “border” of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>A</mi><mo>=</mo><mn>100</mn></mrow></math> region of deformation with precision mass spectrometry of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Kr</mi><mprescripts></mprescripts><none></none><mrow><mn>96</mn><mo>−</mo><mn>98</mn></mrow></mmultiscripts></math>

D. Lunney; V. Manea; M. Mougeot; L. Nies; N. A. Althubiti; D. Atanasov; K. Blaum; A. Herlert; W.-J. Huang; J. Karthein; I. Kulikov; Yu. A. Litvinov; D. Neidherr; T. R. Rodríguez; M. Rosenbusch; L. Schweikhard; T. Steinsberger; A. Welker; F. Wienholtz; R. N. Wolf

doi:10.1103/dhbh-12sc

Extending the low- $Z$ “border” of the $A = 100$ region of deformation with precision mass spectrometry of ${}^{96 - 98}{Kr}$

D. Lunney ^1,*, V. Manea ^1,2,3,†, M. Mougeot^1,2,3, L. Nies ^3,4, N. A. Althubiti^5,6, D. Atanasov ^2,‡, K. Blaum ², A. Herlert ⁷, W.-J. Huang ^1,§ et al.

J. Karthein ^2,3,∥, I. Kulikov ⁸, Yu. A. Litvinov ^8,9, D. Neidherr ⁸, T. R. Rodríguez ^10,¶, M. Rosenbusch ^4,**, L. Schweikhard ⁴, T. Steinsberger ², A. Welker ^3,11, F. Wienholtz ^4,††, and R. N. Wolf ^2,12

¹Université Paris-Saclay, IN2P3/CNRS, IJCLab, 91405 Orsay, France
²Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
³CERN, 1211 Geneva, Switzerland
⁴Universität Greifswald, Institut für Physik, 17487 Greifswald, Germany
⁵Physics Department, College of Science, Jouf University, Sakaka, Kingdom of Saudi Arabia
⁶The University of Manchester, School of Physics and Astronomy, Oxford Road, Manchester M13 9PL, United Kingdom
⁷FAIR GmbH, Planckstraße 1, 64291 Darmstadt, Germany
⁸GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
⁹Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
¹⁰Departamento de Estructura de la Materia, Física Térmica y Electrónica and IPARCOS, Universidad Complutense de Madrid, E-28040 Madrid, Spain
¹¹Technische Universität Dresden, 01069 Dresden, Germany
¹²ARC Centre of Excellence for Engineered Quantum Systems,The University of Sydney, New South Wales 2006, Australia

^*Contact author: david.lunney@cnrs.fr; Present address: CNRS International Research Laboratory for Nuclear Physics, Nuclear Astrophysics and Accelerator Technologies, TRIUMF, Vancouver, BC, Canada.
^†Contact author: vladimir.manea@ijclab.in2p3.fr
^‡Present address: Belgian Nuclear Research Centre SCK CEN, Boeretang 200, 2400 Mol, Belgium.
^§Present address: Advanced Energy Science and Technology Guangdong Laboratory, 516007, Huizhou, China.
^∥Present address: Cyclotron Institute, Department of Physics, Texas A&M University, TX 77840, USA.
^¶Present address: Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, E-41012 Sevilla, Spain.
^**Present address: RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
^††Present address: Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.

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Phys. Rev. C 112, 034307 – Published 5 September, 2025

DOI: https://doi.org/10.1103/dhbh-12sc

Abstract

The onset of collective nuclear behavior in the $N = 60$ , $A \approx 100$ region is examined through high-precision mass measurements of ${}^{96 - 98}{Kr}$ , performed with the ISOLTRAP mass spectrometer at ISOLDE, CERN. Our results for ${}^{96 - 97}{Kr}$ agree with previous measurements, with our new ${}^{97}{Kr}$ Penning-trap mass value being three times more precise. The mass value of ${}^{98}{Kr}$ is measured for the first time. The new mass surface, together with comparisons to beyond-mean-field theoretical predictions, suggests that collectivity persists for the $Z = 36$ isotopes, blurring the apparent “low- $Z$ boundary” of this deformed region.

Physical Review C

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Extending the low- $Z$ “border” of the $A = 100$ region of deformation with precision mass spectrometry of ${}^{96 - 98}{Kr}$

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Extending the low-Z “border” of the A=100 region of deformation with precision mass spectrometry of Kr96−98

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Extending the low- $Z$ “border” of the $A = 100$ region of deformation with precision mass spectrometry of ${}^{96 - 98}{Kr}$