Speaker
Description
Antimony (Sb) contains 51 protons, one proton above the magic Z = 50 proton shell closure. Therefore, its magnetic moments serve as an ideal candidate to probe the proton single particle behavior along the Sb isotopic chain, while its quadrupole moments shed light on collectivity and core polarization effects as a function of neutron number towards the shell closure at N = 82. Furthermore, the change in charge radii across N = 82 can provide a stringent test on nuclear structure theories. For instance, the recent result from the Sn isotopes clearly prefers density function theory of Fayans type over the conventional Skyrme functional [1]. It is therefore of great interest to investigate the influence on the nuclear charge radii from the single proton outside the Z = 50 core.
So far, only scarce data on Sb is available in literature, especially on quadrupole moments and charge radii [2]. Hence, at the COLLAPS experimental beam line (ISOLDE-CERN), hyperfine spectra of 112-134Sb (N = 61 – 83), including many isomers, were measured by the means of high-resolution collinear laser spectroscopy [3] for the first time using the atomic transition 5s25p3 4S3/2 5s25p26s 4P3/2 (transition wavelength 217 nm). From the obtained hyperfine structure nuclear observables such as nuclear spins, magnetic dipole moments, electric quadrupole moments and charge radii are extracted.
This contribution will present these results, providing new insights into the nuclear structure in this mass region and pinning down the nuclear spins of several isotopes, which are currently only tentatively assigned [4]. Additionally, shell-model calculations within the 50-82 major shell (for both proton and neutron) are compared to the trend of the quadrupole moments.
