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Reduction in Nuclear Size and Quadrupole Deformation of High-Spin Isomers of In127,129

A. R. Vernon1,2,3,*, C. L. Binnersley1, R. F. Garcia Ruiz2,4,†, K. M. Lynch1,5, T. Miyagi6,7,8,9,10, J. Billowes1, M. L. Bissell1, T. E. Cocolios3, J. P. Delaroche11,12 et al.

J. Dobaczewski13,14, M. Dupuis11,12, K. T. Flanagan1,25, W. Gins3, M. Girod11, G. Georgiev15, R. P. de Groote3,16, J. D. Holt10,17, J. Hustings3, Á. Koszorús3, D. Leimbach4, J. Libert11, W. Nazarewicz18,19, G. Neyens3, N. Pillet11, P.-G. Reinhard20, S. Rothe4, B. K. Sahoo21, S. R. Stroberg22, S. G. Wilkins2,4, X. F. Yang3,23, Z. Y. Xu3, and D. T. Yordanov24

  • *Present address: Duke University, Durham, North Carolina, USA.
  • †Contact author: rgarciar@mit.edu
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Phys. Rev. Lett. 134, 252501 – Published 26 June, 2025

DOI: https://doi.org/10.1103/m35x-mw7z

Abstract

We employed laser spectroscopy of atomic transitions to measure the nuclear charge radii and electromagnetic properties of the high-spin isomeric states in neutron-rich indium isotopes (Z=49) near the closed proton and neutron shells at Z=50 and N=82. Our data reveal a reduction in the nuclear charge radius and intrinsic quadrupole moment when protons and neutrons are fully aligned in In129(N=80), to form the high spin isomer. Such a reduction is not observed in In127(N=78), where more complex configurations can be formed by the existence of four neutron holes. These observations are not consistently described by nuclear theory.

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See Also

Variations in the charge radii of indium isotopes between N=52 and 82

A. R. Vernon et al. (CRIS-ISOLDE Collaboration)
Phys. Rev. C 111, 064325 (2025)

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Phys. Rev. Lett. 134, 252501– Published 26 June, 2025
  • Received 23 November 2024
  • Revised 12 April 2025
  • Accepted 16 May 2025
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