Laser spectroscopy for nuclear structure physics

Abstract

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Unexpectedly large difference of the electron density at the nucleus in the $$ 4p\, ^2{\mathrm {P}}_{{1}/{2},{3}/{2}}$$ 4 p 2 P 1 / 2 , 3 / 2 fine-structure doublet of Ca $$^+$$ +

“…These reach from the extraction of nuclear properties from atomic spectra to applications in astronomy and fundamental physics. The spectrum of atoms and ions encodes information that provides a key to the ground-state properties of nuclei [2,3], small parity-violating effects caused by the weak interaction [4], for unitarity tests of the Cabibbo-Kobayashi-Maskawa (CKM) matrix [5], or for probing the Higgs coupling between electrons and quarks [6]. Light appearing on earth from stars at large distances is red shifted and can provide information about the spectra of atoms in ancient times and whether there have been changes, for example from a variation of the fine structure constant α.…”

Laser and decay spectroscopy of the short-lived isotope Fr214 in the vicinity of the N=126 shell closure

“…A first observation is that the gradient in the charge radii between the N = 125 and N = 126 isotones is smaller than the gradient between N = 126 and N = 127. The latter leads to the well-known kink in the radii values [4]. A second observation is that the change in the radii below N = 126 is more or less constant for all isotopes from Hg (Z = 80) up to Ra (Z = 88), while an increase of the slope in the kink is observed with an increasing number of protons beyond Z = 82.…”

“…1 by means of a χ 2 -minimization fitting routine [4]. The center of gravity of the hyperfine spectrum of 214 Fr was compared to the reference isotope, 221 Fr, for extraction of the isotope shift.…”

“…In this paper we focus on the charge radii in the trans-lead region and in particular, the characteristic increase in the gradient that is observed at a shell closure crossing. This is often referred to as a "kink" [4] and has already been seen at N = 126 in the neighboring isotopes from thallium to radium [5][6][7][8][9][10][11][12].…”

Development of a saturated absorption spectroscopy setup at IGISOL for characterisation of Fabry-Pérot interferometers

“…This was due to imbalances in the photodiodes and their amplifiers, and absorption differences in the probe and reference beam. The reflections of the thick beam splitter are not equal in power, so slight steering and power changes while scanning the Ti:sapphire laser frequency affect both photodiode The HFS splittings were calculated using the standard HFS equation [12] using HFS parameters from [13,14].…”