High-precision quadrupole moment reveals significant intruder component in $^{33}_{13}$Al$_{20}$ ground state

Abstract : The electric quadrupole moment of the 33Al20 ground state, located at the border of the island of inversion, was obtained using continuous-beam beta-detected nuclear quadrupole resonance (beta-NQR). From the measured quadrupole coupling constant Q = 2.31(4) MHz in an alpha-Al2O3 crystal, a precise value for the electric quadrupole moment is extracted: Qs= 141(3) mb. A comparison with large-scale shell model calculations shows that 33Al has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the N = 20 shell gap. 33Al therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal Z>14 isotopes.
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Submitted on : Tuesday, August 30, 2016 - 8:47:35 AM
Last modification on : Thursday, February 21, 2019 - 10:31:47 AM

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H. Heylen, M. de Rydt, G. Neyens, M.L. Bissell, L. Caceres, et al.. High-precision quadrupole moment reveals significant intruder component in $^{33}_{13}$Al$_{20}$ ground state. Physical Review C, American Physical Society, 2016, 94, pp.034312. ⟨10.1103/PhysRevC.94.034312⟩. ⟨in2p3-01357517⟩

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