Hyperfine anomaly in Be isotopes and the neutron spatial distribution: A three-cluster model for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Be</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>9</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

The study of the hyperfine (hfs) anomaly in neutron rich nuclei can give a very specific and unique way to study the neutron distribution and the clustering structure. We study the sensitivity of the hfs anomaly to the clustering effects in the $^{9}\mathrm{Be}$ isotope using two different nuclear wave functions obtained in the three-cluster ($\ensuremath{\alpha}+\ensuremath{\alpha}+n$) model. The results are compared to those obtained for $^{9,11}\mathrm{Be}$ in a two-body core+neutron model to examine whether the hfs anomaly is sensitive to a halo structure in $^{11}\mathrm{Be}$.

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