Speaker
Description
The neutron-rich Al isotopes provide an excellent opportunity to investigate the evolution of nuclear structure crossing the $N=20$ shell closure and the transition into the island of inversion. Indeed, the Al isotopic chain, with $Z = 13$, is located between spherical silicon [1] ($Z = 14, N = 19$) and deformed magnesium ($Z = 12, N = 21$) [2], $^{32}$Mg being the center of the $N = 20$ island of inversion. At present, charge radii measurements of radioactive isotopes in this region are limited up to N = 20 shell closure for Mg [2] and Na [3], and N = 19 for Al[4]. The CRIS collaboration recently measured $^{26-34}$Al using laser spectroscopy, crossing the $N = 20$ shell closure, building on previous results measured at ISOLDE, CERN [4].
In this talk, a brief overview of CRIS will be introduced before presenting measurements of the change in charge radii along the isotopic chain of Al. In particular, the first charge radii measurements of $^{33, 34}$Al will be highlighted. These results will then be discussed in relation to the $N = 20$ shell closure and the implications when entering the island of inversion.
[1] R. W. Ibbotson et al. “Quadrupole Collectivity in 32,34,36,38Si and the N = 20 Shell Closure”. In:
Phys. Rev. Lett. 80 (10 Mar. 1998), pp. 2081–2084. doi: 10.1103/PhysRevLett.80.2081. url: https://link.aps.org/doi/10.1103/PhysRevLett.80.2081.
[2] D Yordanov et al. “Nuclear charge radii of (21-32)Mg.” In: Physical review letters 108 (Jan. 2012),
p. 042504. doi: 10.1103/PhysRevLett.108.042504.
[3] G. Huber et al. “Spins, magnetic moments, and isotope shifts of 21−31Na by high resolution laser
spectroscopy of the atomic D1 line”. In: Phys. Rev. C 18 (5 Nov. 1978), pp. 2342–2354. doi: 10.1103/
PhysRevC.18.2342. url: https://link.aps.org/doi/10.1103/PhysRevC.18.2342.
[4] H. Heylen et al. “High-resolution laser spectroscopy of 27−−32Al”. In: Phys. Rev. C 103 (1 Jan. 2021), p.014318. doi: 10.1103/PhysRevC.103.014318. url: https://link.aps.org/doi/10.1103/PhysRevC.103.014318.
