Evidence of a sudden increase in the nuclear size of proton-rich silver-96

M. Reponen (), R. P. de Groote, L. Al Ayoubi, O. Beliuskina, M. L. Bissell, P. Campbell, L. Cañete, B. Cheal, K. Chrysalidis, C. Delafosse, A. de Roubin, C. S. Devlin, T. Eronen, R. F. Garcia Ruiz, S. Geldhof, W. Gins, M. Hukkanen, P. Imgram, A. Kankainen, M. Kortelainen, Á. Koszorús, S. Kujanpää, R. Mathieson, D. A. Nesterenko, I. Pohjalainen, M. Vilén, A. Zadvornaya and I. D. Moore
Additional contact information
M. Reponen: University of Jyväskylä
R. P. de Groote: University of Jyväskylä
L. Al Ayoubi: University of Jyväskylä
O. Beliuskina: University of Jyväskylä
M. L. Bissell: University of Manchester
P. Campbell: University of Manchester
L. Cañete: University of Surrey
B. Cheal: University of Liverpool
K. Chrysalidis: CERN
C. Delafosse: University of Jyväskylä
A. de Roubin: University of Jyväskylä
C. S. Devlin: University of Liverpool
T. Eronen: University of Jyväskylä
R. F. Garcia Ruiz: Massachusetts Institute of Technology
S. Geldhof: University of Jyväskylä
W. Gins: University of Jyväskylä
M. Hukkanen: University of Jyväskylä
P. Imgram: Institut für Kernphysik
A. Kankainen: University of Jyväskylä
M. Kortelainen: University of Jyväskylä
Á. Koszorús: University of Liverpool
S. Kujanpää: University of Jyväskylä
R. Mathieson: University of Liverpool
D. A. Nesterenko: University of Jyväskylä
I. Pohjalainen: University of Jyväskylä
M. Vilén: University of Jyväskylä
A. Zadvornaya: University of Jyväskylä
I. D. Moore: University of Jyväskylä

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Understanding the evolution of the nuclear charge radius is one of the long-standing challenges for nuclear theory. Recently, density functional theory calculations utilizing Fayans functionals have successfully reproduced the charge radii of a variety of exotic isotopes. However, difficulties in the isotope production have hindered testing these models in the immediate region of the nuclear chart below the heaviest self-conjugate doubly-magic nucleus 100Sn, where the near-equal number of protons (Z) and neutrons (N) lead to enhanced neutron-proton pairing. Here, we present an optical excursion into this region by crossing the N = 50 magic neutron number in the silver isotopic chain with the measurement of the charge radius of 96Ag (N = 49). The results provide a challenge for nuclear theory: calculations are unable to reproduce the pronounced discontinuity in the charge radii as one moves below N = 50. The technical advancements in this work open the N = Z region below 100Sn for further optical studies, which will lead to more comprehensive input for nuclear theory development.

Date: 2021
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DOI: 10.1038/s41467-021-24888-x

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