Speaker
Description
Collinear laser spectroscopy (CLS) is a powerful technique to probe the structure information of the ground and long-lived isomeric states by measuring their nuclear spins, moments and charge radii [1, 2, 3]. Over the last decade, this technique has been intensively employed for the study of the exotic isotopes of the Ni region, namely around the major proton shell closure at Z = 28 and between two major neutron shell closures, N = 28 and N = 50 [4, 5]. Nuclear moments measured in this region have been used to systematically investigate the structure evolution information, such as the (sub-shell) effect of N = 40 and N = 50，and also act as an important input for the large-scale shell-model interaction. [6]. In addition, observed nuclear charge radii led to the discovery of previously unknown phenomena for the region, such as the inverted odd-even staggering in the Zn (Z = 30) and Ga (Z = 31) isotopic chains [7, 8], which however does not appear in the Ni (Z = 28) and Cu (Z = 29) isotopic chains. Thus, with more protons added beyond the Z = 28 closed shell, the study of the Ge isotopic chain (Z = 32) is interesting for the study of the nuclear shell evolution, the onset of the collectivity and triaxiality effects [9], and the nature of the inverted odd-even staggering effect.
By taking the advantages of the frequency mixing technique, the $4s^24p^2$ $^3P_1$ - $4s^24p5s$ $^3P_1$ (269 nm) atomic transition of Ge atom could be probed for the first time with high-resolution laser spectroscopy technique, resulting in the hyperfine structure measurement of Ge isotopes around N = 40. Detail information related to the experiment will be presented, together with the preliminary results.
[1] P. Campbell et al., Progress in Particle and Nuclear Physics 86, 127-180 (2016)
[2] M. J. G. Borge and K. Blaum, J. Phys. G: Nucl. Part. Phys., 45 010301 (2018)
[3] R. Neugart et al., J. Phys. G: Nucl. Part. Phys., 44 064002 (2017)
[4] M. L. Bissell et al., Phys. Rev. C 93, 064318 (2016)
[5] K. T. Flanagan et al., Phys. Rev. Lett. 103, 142501 (2009)
[6] X. F. Yang et al., Phys. Rev. Lett. 116, 182502 (2016)
[7] T. J. Procter et al., Phys. Rev. C 86, 034329 (2012)
[8] L. Xie et al., in preparation
[9] X.F. Yang et al., Phys. Rev. C 97, 044324 (2018)
