High-spin isomers in neutron-rich indium isotopes have smaller charge radii than their ground states, with 129In showing a three times larger reduction than 127In, a pattern no current nuclear model reproduces.
Electromagnetic Properties of Indium Isotopes Elucidate the Doubly Magic Character of $^{100}$Sn
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
Our understanding of nuclear properties in the vicinity of $^{100}$Sn, suggested to be the heaviest doubly magic nucleus with equal numbers of protons (Z=50) and neutrons (N=50), has been a long-standing challenge for experimental and theoretical nuclear physics. Contradictory experimental evidence exists on the role of nuclear collectivity in this region of the nuclear chart. Using precision laser spectroscopy, we measured the ground-state electromagnetic moments of indium (Z=49) isotopes approaching the N=50 neutron number down to 101In, and nuclear charge radii of 101-131In spanning almost the complete range between the two major neutron closed-shells at N=50 and N=82. Our results for both nuclear charge radii and quadrupole moments reveal striking parabolic trends as a function of the neutron number, with a clear reduction toward these two neutron closed-shells, thus supporting a doubly magic character of $^{100}$Sn. Two complementary nuclear many-body frameworks, density functional theory and ab initio methods, elucidate our findings. A detailed comparison with our experimental results exposes deficiencies of nuclear models, establishing a benchmark for future theoretical developments.
fields
nucl-ex 1years
2025 1verdicts
ACCEPT 1representative citing papers
citing papers explorer
-
Reduction in nuclear size and quadrupole deformation of high-spin isomers of 127,129In
High-spin isomers in neutron-rich indium isotopes have smaller charge radii than their ground states, with 129In showing a three times larger reduction than 127In, a pattern no current nuclear model reproduces.