Nuclear moments of indium isotopes reveal abrupt change at magic number 82
ORAL
Abstract
In this contribution, we present measurements of the nuclear magnetic dipole moments and nuclear electric quadrupole moments of the 113-131In isotope chain, performed using the Collinear Resonance Laser Spectroscopy experiment at ISOLDE, CERN.
We show that the electromagnetic properties of the neutron-rich indium isotopes significantly differ at N = 82 compared to N < 82, despite the single unpaired proton dominating the behaviour of this complex many-body system. This challenges our previous understanding of these isotopes, which were considered a textbook example for the dominance of single-particle properties in nuclei [1, 2].
To investigate the microscopic origin of our experimental results, we performed a combined effort with developments in two complementary nuclear many-body methods: ab-initio valence space in-medium similarity normalization group [3,4] and density functional theory [5].
When compared with our experimental results, contributions from previously poorly constrained time-odd channels [6,7], and many-body currents [8] are found to be important, demonstrating electromagnetic properties of ‘proton-hole’ isotopes around magic shell closures at extreme proton-to-neutron ratios can give us crucial insights.
[1] - K. Heyde. The Nuclear Shell Model. Springer Series in Nuclear and Particle Physics. Springer Berlin Heidelberg, Berlin, Heidelberg, 1990.
[2] - J. Eberz et al. Nuclear Physics A, 464(1):9–28, 1987
[3] - R. Stroberg et al. Annual Review of Nuclear and Particle Science, 69(1), 2019.
[4] - P. Gysbers et al. Nature Physics, 15(5):428–431, 2019.
[5] - J. Dobaczewski et al. J. Phys. G: Nucl. Part. Phys., 48(10):102001, 2021.
[6] – J.Engel and J. Menéndez. Reports on Progress in Physics, 80(4):046301, 2017
[7] – J. Dobaczewski et al. Phys. Rev. Lett., 121:232501, 2018.
[8] - S. Pastore et al. Phys. Rev. C, 87:035503, 2013.
We show that the electromagnetic properties of the neutron-rich indium isotopes significantly differ at N = 82 compared to N < 82, despite the single unpaired proton dominating the behaviour of this complex many-body system. This challenges our previous understanding of these isotopes, which were considered a textbook example for the dominance of single-particle properties in nuclei [1, 2].
To investigate the microscopic origin of our experimental results, we performed a combined effort with developments in two complementary nuclear many-body methods: ab-initio valence space in-medium similarity normalization group [3,4] and density functional theory [5].
When compared with our experimental results, contributions from previously poorly constrained time-odd channels [6,7], and many-body currents [8] are found to be important, demonstrating electromagnetic properties of ‘proton-hole’ isotopes around magic shell closures at extreme proton-to-neutron ratios can give us crucial insights.
[1] - K. Heyde. The Nuclear Shell Model. Springer Series in Nuclear and Particle Physics. Springer Berlin Heidelberg, Berlin, Heidelberg, 1990.
[2] - J. Eberz et al. Nuclear Physics A, 464(1):9–28, 1987
[3] - R. Stroberg et al. Annual Review of Nuclear and Particle Science, 69(1), 2019.
[4] - P. Gysbers et al. Nature Physics, 15(5):428–431, 2019.
[5] - J. Dobaczewski et al. J. Phys. G: Nucl. Part. Phys., 48(10):102001, 2021.
[6] – J.Engel and J. Menéndez. Reports on Progress in Physics, 80(4):046301, 2017
[7] – J. Dobaczewski et al. Phys. Rev. Lett., 121:232501, 2018.
[8] - S. Pastore et al. Phys. Rev. C, 87:035503, 2013.
*This work was funded, in part, by the Department of Energy.
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Publication: Accepted as a Nature article to be published July 14th
Preprint doi: https://www.researchsquare.com/article/rs-611360/v1
Presenters
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Adam R Vernon
- Massachusetts Institute of Technology MI