Tassos Kanellakopoulos, "Shell evolution on germanium isotopic chain"

Wednesday 4 Mar 2020, 14:00 → 15:00 Europe/Zurich

26/1-022 (CERN)

Collinear laser spectroscopy is a high precision technique to determine the nuclear ground and isomeric state properties in a model independent way [1]. The hyperfine spectra of 68-74Ge (Z = 32) were acquired at the COLLAPS experimental setup located at ISOLDE-CERN. With the use of the frequency mixing technique, the 4s24p2 3P1 - 4s24p5s 3P1 (269 nm) atomic transition of germanium was probed. The electromagnetic moments and differences in mean square charge radii for these isotopes were extracted. The extracted data will help us shed light on the interesting phenomena taking place on the N = 40 region. One such phenomenon is the inverted odd-even staggering effect recently observed in the charge radii of the zinc (Z = 30) and gallium (Z = 31) isotopic chains [2, 3]. Such an effect has also been previously observed in the charge radii of the heavier krypton (Z = 36), rubidium (Z = 37) and strontium (Z = 38) isotopic chains [4]. Measuring the radii of 68-74Ge, crossing the N = 40, allows the investigation of the evolution of the odd-even staggering effect as a function of Z as well as the appearance of a signature of the N = 40 subshell effect [5]. The measured magnetic dipole and electric quadrupole moments indicate the single particle and collective nature of the ground states of the odd germanium isotopes.

[1] R. Neugart et al., J. Phys. G: Nucl. Part. Phys. 44, 064002 (2017)
[2] L. Xie et al., Phys. Lett. B 797, 134805 (2019)
[3] T.J. Procter et al., Phys. Rev. C 86, 034329 (2012)
[4] P. Lievens et al., EPL 33 11 (1996)
[5] M.L. Bissell et al., Phys. Rev. C 93, 064318 (2016)