Abstract
The cluster structures of the excited states in $^{11}$B are studied by analyzing the isoscalar monopole and quadrupole strengths in the $^{11}$B($d$,$d'$) reaction at $E_d=200$ MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the $3/2^-_3$ state at $E_x=8.56$ MeV is well described by the AMD calculation and is an evidence for a developed $2\alpha+t$ cluster structure.
Highlights
Alpha particle clustering is an important concept in nuclear physics for light nuclei
The predicted 3/2−3 state carries almost no monopole excitation strength, while the observed 3/2−3 state is dominantly excited by the ∆Jπ = 0+ transition [see Fig. 1(e)]
To examine cluster nature of excited states in 11B, the experimental results are compared with the antisymmetrized molecular-dynamics (AMD) calculation
Summary
Alpha particle clustering is an important concept in nuclear physics for light nuclei. The SM calculation reasonably well explains the experimental B(E2; IS) and B(E2) values for the low-lying states, the description for the transition properties for states at Ex ∼ 9 MeV is not reasonable. For the 5/2−2 state at Ex = 8.92 MeV, the SM calculation gives extremely small quadrupole strengths and underestimates the experimental data the spin-flip M1 strengths are well described in Ref.
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