Abstract

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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