Proton superfluidity and charge radii in proton-rich calcium isotopes

Laser Spectroscopy of Neutron-Rich Tin Isotopes: A Discontinuity in Charge Radii across the N=82 Shell Closure

“…[25]. The resulting model was found not only to reproduce the charge radii in the calcium isotopes but also to provide an excellent prediction for the iron radii at the N ¼ 28 shell closure [41], the very light calcium isotopes down to 36 Ca [42] and, remarkably, also for the much heavier Cd isotopes from 100 Cd to 130 Cd [28]. Motivated by the recent experimental and theoretical developments, we present here new data on charge radii for the even-even 108−134 Sn isotopes based on high-precision laser spectroscopic measurements, crossing for the first time the doubly magic N ¼ 82 shell closure in the tin isotopic chain.…”

“…Theoretical analysis.-To understand the experimental findings, we employed nuclear DFT [50] at a spherical Hartree-Fock-Bogoliubov (HFB) level as in Ref. [42]. Calculations were carried out using two different energy functionals.…”

Beyond the charge radius: The information content of the fourth radial moment

“…Measurements of the corresponding frequencies, typically of the order of MHz, allow changes in the root-mean-squared (rms) nuclear charge radii to be extracted [5,6]. Extending these measurements for isotopes away from stability is of marked and growing interest for low-energy nuclear physics, as the data on the nuclear size are essential for our understanding of the nuclear many-body problem [5,[7][8][9][10]. In recent years, the interest in precision isotope shift measurements has increased significantly.…”

Swelling of Doubly Magic Ca48 Core in Ca Isotopes beyond N=28

“…Recently, unexpectedly large charge radii were observed in neutron-rich Ca isotopes beyond N = 28 [7]. This sudden growth in charge radii from 48 Ca (N = 28) to 52 Ca represents a challenging problem; it has not been quan-titatively explained by any theoretical calculations other than the Hartree-Fock-Bogolyubov calculation with the Fayans energy density functional [8]. This anomalous phenomenon observed in Ca isotopes is stimulating further studies of nuclear charge radii in a wide mass region [8][9][10][11][12].In contrast, information on the evolution of the size of the neutron density distribution has not been obtained across N = 28.…”

“…This sudden growth in charge radii from 48 Ca (N = 28) to 52 Ca represents a challenging problem; it has not been quan-titatively explained by any theoretical calculations other than the Hartree-Fock-Bogolyubov calculation with the Fayans energy density functional [8]. This anomalous phenomenon observed in Ca isotopes is stimulating further studies of nuclear charge radii in a wide mass region [8][9][10][11][12].In contrast, information on the evolution of the size of the neutron density distribution has not been obtained across N = 28. For example, nucleon density distributions ρ m (r) or point-neutron density distributions ρ n (r) for Ca isotopes have been deduced only for stable nuclei, 40,42,44,48 Ca, through the hadron elastic scattering [13][14][15][16][17][18][19][20][21][22][23].The experimental data for root-mean-square (RMS) radii of ρ m (r) or ρ n (r) for Ca isotopes beyond N = 28…”