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2α+t cluster structure in ¹¹B

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arxiv nucl-ex/0512040 v5 pith:4KVBMWV5 submitted 2005-12-25 nucl-ex nucl-th

2α+t cluster structure in ¹¹B

classification nucl-ex nucl-th
keywords clusteralphamonopolestrengthsstructureanalyzingantisymmetrizedcalculation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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