Coulomb excitation of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Sr</mi><mprescripts></mprescripts><none></none><mn>80</mn></mmultiscripts></math> and the limits of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mo>≈</mo><mi>Z</mi><mo>≈</mo><mn>40</mn></mrow></math> island of deformation

R. Russell; J. Heery; J. Henderson; R. Wadsworth; K. Kaneko; N. Shimizu; T. Mizusaki; Y. Sun; C. Andreoiu; D. W. Annen; A. A. Avaa; G. C. Ball; V. Bildstein; S. Buck; C. Cousins; A. B. Garnsworthy; S. A. Gillespie; B. Greaves; A. Grimes; G. Hackman; R. O. Hughes; D. G. Jenkins; T. M. Kowalewski; M. S. Martin; C. Müller-Gatermann; J. R. Murias; S. Murillo Morales; S. Pascu; D. M. Rhodes; J. Smallcombe; P. Spagnoletti; C. E. Svensson; B. Wallis; J. Williams; C. Y. Wu; D. Yates

doi:10.1103/t91y-l6rf

Coulomb excitation of ${}^{80}{Sr}$ and the limits of the $N \approx Z \approx 40$ island of deformation

R. Russell ¹, J. Heery ¹, J. Henderson ^1,*, R. Wadsworth ², K. Kaneko ³, N. Shimizu ⁴, T. Mizusaki⁵, Y. Sun⁶, C. Andreoiu ⁷ et al.

D. W. Annen ⁷, A. A. Avaa ⁸, G. C. Ball⁸, V. Bildstein ⁹, S. Buck⁹, C. Cousins¹, A. B. Garnsworthy⁸, S. A. Gillespie ¹⁰, B. Greaves ⁹, A. Grimes⁸, G. Hackman ⁸, R. O. Hughes¹¹, D. G. Jenkins ², T. M. Kowalewski ^12,13, M. S. Martin ^14,†, C. Müller-Gatermann ¹⁵, J. R. Murias ⁸, S. Murillo Morales ⁸, S. Pascu ^1,16, D. M. Rhodes^8,11, J. Smallcombe ¹⁷, P. Spagnoletti ⁷, C. E. Svensson^8,9, B. Wallis ², J. Williams ⁸, C. Y. Wu¹¹, and D. Yates ^8,18

¹School of Maths and Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
²School of Physics, Engineering and Technology, University of York, York, North Yorkshire YO10 5DD, United Kingdom
³Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503, Japan
⁴Center for Computational Sciences, University of Tsukuba, Tennodai, Tsukuba 305-8577, Japan
⁵Institute of Natural Sciences, Senshu University, Tokyo 101-8425, Japan
⁶School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
⁷Department of Chemistry, Simon Fraser University, Burnaby, British ColumbiaV5A 1S6, Canada
⁸TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
⁹Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
¹⁰Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
¹¹Lawrence Livermore National Laboratory, Livermore, California 94550, USA
¹²Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA
¹³Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA
¹⁴Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
¹⁵Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
¹⁶National Institute for Physics and Nuclear Engineering, Bucharest-Magurele R-77125, Romania
¹⁷Japan Atomic Energy Agency, Naka-gun, Ibaraki 319-1184, Japan
¹⁸Department of Physics and Astronomy, University of British Columbia, Vancouver, British ColumbiaV6T 1Z4, Canada

^*Contact author: jack.henderson@surrey.ac.uk
^†Present address: Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.

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Phys. Rev. C 112, 014309 – Published 7 July, 2025

DOI: https://doi.org/10.1103/t91y-l6rf

Abstract

The region of $N \approx Z \approx 40$ has long been associated with strongly deformed nuclear configurations. The presence of this strong deformation was recently confirmed through lifetime measurements in $N \approx Z$ Sr and Zr nuclei. Theoretically, however, these nuclei present a challenge due to the vast valence space required to incorporate all necessary orbitals. Recent state-of-the-art predictions indicate a near axial prolate deformation for $N = Z$ and $N = Z + 2$ nuclei between $N = Z = 36$ and $N = Z = 40$ . In this work we investigate the shores of this island of deformation through a sub-barrier Coulomb excitation study of the $N = Z + 4$ nucleus, ${}^{80}{Sr}$ . Extracting a spectroscopic quadrupole moment of $Q_{s} (2_{1}^{+}) = 0 . 5_{- 0.9}^{+ 0.8} e b$ , we find that ${}^{80}{Sr}$ is inconsistent with significant axial prolate deformation with a significance of $1.5 σ$ . This result, albeit with a large uncertainty, indicates that the predicted region of strong prolate deformation around $N = Z = 40$ is tightly constrained to the quartet of nuclei: ${}^{76, 78}{Sr}$ and ${}^{78, 80}{Zr}$ .

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Coulomb excitation of ${}^{80}{Sr}$ and the limits of the $N \approx Z \approx 40$ island of deformation

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Coulomb excitation of Sr80 and the limits of the N≈Z≈40 island of deformation

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Coulomb excitation of ${}^{80}{Sr}$ and the limits of the $N \approx Z \approx 40$ island of deformation