Reduction in Nuclear Size and Quadrupole Deformation of High-Spin Isomers of ^{127,129}In

A R Vernon^{1

2

3}, C L Binnersley¹, R F Garcia Ruiz^{2

4}, K M Lynch^{1

5}, T Miyagi^{6

7

8

9

10}, J Billowes¹, M L Bissell¹, T E Cocolios³, J P Delaroche^{11

12}, J Dobaczewski^{13

14}, M Dupuis^{11

12}, K T Flanagan^{1

15}, W Gins³, M Girod¹¹, G Georgiev¹⁶, R P de Groote^{3

17}, J D Holt^{10

18}, J Hustings³, Á Koszorús³, D Leimbach⁴, J Libert¹¹, W Nazarewicz^{19

20}, G Neyens³, N Pillet¹¹, P-G Reinhard²¹, S Rothe⁴, B K Sahoo²², S R Stroberg²³, S G Wilkins^{2

4}, X F Yang^{3

24}, Z Y Xu³, D T Yordanov²⁵

Affiliations

¹ The University of Manchester, Department of Physics and Astronomy, Manchester M13 9PL, United Kingdom.
² Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
³ KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium.
⁴ CERN, CH-1211 Geneva 23, Switzerland.
⁵ CERN, EP Department, CH-1211 Geneva 23, Switzerland.
⁶ University of Tsukuba, Center for Computational Sciences, Ibaraki, 305-8577, Japan.
⁷ Technische Universität Darmstadt, Department of Physics, 64289 Darmstadt, Germany.
⁸ GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute EMMI, 64291 Darmstadt, Germany.
⁹ Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
¹⁰ TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
¹¹ CEA, DAM, DIF, F-91297 Arpajon, France.
¹² Université Paris-Saclay, CEA, LMCE, 91680 Bruyères-le-Châtel, France.
¹³ University of York, School of Physics, Engineering and Technology, Heslington, York YO10 5DD, United Kingdom.
¹⁴ University of Warsaw, Institute of Theoretical Physics, Faculty of Physics, ul. Pasteura 5, PL-02-093 Warsaw, Poland.
¹⁵ The University of Manchester, Photon Science Institute, Manchester, United Kingdom.
¹⁶ Université Paris-Saclay, IJCLab, CNRS-IN2P3, Université Paris-Sud, Orsay, France.
¹⁷ University of Jyväskylä, Department of Physics, Survontie 9, Jyväskylä, FI-40014, Finland.
¹⁸ McGill University, Department of Physics, Montréal, Quebec City H3A 2T8, Canada.
¹⁹ Michigan State University, Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA.
²⁰ Michigan State University, Department of Physics and Astronomy, East Lansing, Michigan 48824, USA.
²¹ Universität Erlangen-Nürnberg, Institut für Theoretische Physik II, 91058 Erlangen, Germany.
²² Physical Research Laboratory, Atomic, Molecular and Optical Physics Division, Navrangpura, Ahmedabad 380009, India.
²³ University of Notre Dame, Department of Physics and Astronomy, Notre Dame, Indiana 46556, USA.
²⁴ Peking University, School of Physics and State Key Laboratory of Nuclear Physics and Technology, Beijing 100871, China.
²⁵ Université Paris-Saclay, IJCLab, Université Paris-Sud, Orsay, France.

PMID: 40743026
DOI: 10.1103/m35x-mw7z

Reduction in Nuclear Size and Quadrupole Deformation of High-Spin Isomers of ^{127,129}In

A R Vernon et al. Phys Rev Lett. 2025.

. 2025 Jun 27;134(25):252501.

doi: 10.1103/m35x-mw7z.

Authors

Affiliations

¹ The University of Manchester, Department of Physics and Astronomy, Manchester M13 9PL, United Kingdom.
² Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
³ KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium.
⁴ CERN, CH-1211 Geneva 23, Switzerland.
⁵ CERN, EP Department, CH-1211 Geneva 23, Switzerland.
⁶ University of Tsukuba, Center for Computational Sciences, Ibaraki, 305-8577, Japan.
⁷ Technische Universität Darmstadt, Department of Physics, 64289 Darmstadt, Germany.
⁸ GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute EMMI, 64291 Darmstadt, Germany.
⁹ Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
¹⁰ TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
¹¹ CEA, DAM, DIF, F-91297 Arpajon, France.
¹² Université Paris-Saclay, CEA, LMCE, 91680 Bruyères-le-Châtel, France.
¹³ University of York, School of Physics, Engineering and Technology, Heslington, York YO10 5DD, United Kingdom.
¹⁴ University of Warsaw, Institute of Theoretical Physics, Faculty of Physics, ul. Pasteura 5, PL-02-093 Warsaw, Poland.
¹⁵ The University of Manchester, Photon Science Institute, Manchester, United Kingdom.
¹⁶ Université Paris-Saclay, IJCLab, CNRS-IN2P3, Université Paris-Sud, Orsay, France.
¹⁷ University of Jyväskylä, Department of Physics, Survontie 9, Jyväskylä, FI-40014, Finland.
¹⁸ McGill University, Department of Physics, Montréal, Quebec City H3A 2T8, Canada.
¹⁹ Michigan State University, Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA.
²⁰ Michigan State University, Department of Physics and Astronomy, East Lansing, Michigan 48824, USA.
²¹ Universität Erlangen-Nürnberg, Institut für Theoretische Physik II, 91058 Erlangen, Germany.
²² Physical Research Laboratory, Atomic, Molecular and Optical Physics Division, Navrangpura, Ahmedabad 380009, India.
²³ University of Notre Dame, Department of Physics and Astronomy, Notre Dame, Indiana 46556, USA.
²⁴ Peking University, School of Physics and State Key Laboratory of Nuclear Physics and Technology, Beijing 100871, China.
²⁵ Université Paris-Saclay, IJCLab, Université Paris-Sud, Orsay, France.

PMID: 40743026
DOI: 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 ^{129}In(N=80), to form the high spin isomer. Such a reduction is not observed in ^{127}In(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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Reduction in Nuclear Size and Quadrupole Deformation of High-Spin Isomers of ^{127,129}In

Affiliations

Reduction in Nuclear Size and Quadrupole Deformation of High-Spin Isomers of ^{127,129}In

Authors

Affiliations

Abstract