The cluster structures of the excited states in 11B are studied by analyzing the isoscalar monopole and quadrupole strengths in the 11B(d, d′) reaction at Ed 200 MeV. The excitation strengths are compared with the theoretical predictions by the antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/2-3 state at Ex 8.56 MeV is well described by the AMD wave function with a dilute 2α + tcluster structure.
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