TY - JOUR
TI - High-precision quadrupole moment reveals significant intruder component in Al20 1333 ground state
AU - Heylen, H.
AU - De Rydt, M.
AU - Neyens, G.
AU - Bissell, M.L.
AU - Caceres, L.
AU - Chevrier, R.
AU - Daugas, J.M.
AU - Ichikawa, Y.
AU - Ishibashi, Y.
AU - Kamalou, O.
AU - Mertzimekis, T.J.
AU - Morel, P.
AU - Papuga, J.
AU - Poves, A.
AU - Rajabali, M.M.
AU - Stödel, C.
AU - Thomas, J.C.
AU - Ueno, H.
AU - Utsuno, Y.
AU - Yoshida, N.
AU - Yoshimi, A.
JO - Physical Review C
PY - 2016
VL - 94
TODO - 3
SP - null
PB - American Physical Society
SN - 2469-9985, 2469-9993
TODO - 10.1103/PhysRevC.94.034312
TODO - null
TODO - The electric quadrupole moment of the Al201333 ground state, located at the border of the island of inversion, was obtained using continuous-beam β-detected nuclear quadrupole resonance (β-NQR). From the measured quadrupole coupling constant νQ=2.31(4) MHz in an α-Al2O3 crystal, a precise value for the electric quadrupole moment is extracted: QsAl33=141(3) mb. A comparison with large-scale shell model calculations shows that Al33 has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the N=20 shell gap. Al33 therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal Z≥14 isotopes. © 2016 American Physical Society.
ER -