Nuclear moments of the neutron-rich Al isotopes at the border of the island of inversion.
by
Hanne Heylen(Max-Planck-Gesellschaft (DE))
→
Europe/Zurich
26-1-22 (CERN)
26-1-22
CERN
Description
Located above the deformed Mg isotopes, the neutron-rich Al (Z = 13) isotopes constitute the northern border of the island of inversion around N = 20 . Their structure was investigated in two beta-NMR/NQR experiments at the LISE-GANIL facility.
The quadrupole moment of 33Al is measured with a 5 times higher precision than the previous value. It is only due to this high precision, that it could be unambiguously concluded that there is a significant amount of intruder configurations in the ground state wave function, placing 33Al inside rather than outside of the island of inversion.
Furthermore, the g -factor and quadrupole moment of the recently discovered 1+ isomer in 34Al is discussed. While so far, 2p-2h (and 4p-4h) excitations are found to dominate the ground and long-lived states in the island of inversion, this low-lying 1+ isomer is proposed to have a 1p-1h configuration. Its g -factor and quadrupole moment, in comparison with the 1+ normal ground state of 32Al, enable the verification of this proposed intruder nature and offer the unique opportunity to study the increase in deformation due to these particular 1p-1h excitations.
