TY - JOUR
T1 - Dipole excitation and geometry of Borromean nuclei
AU - Hagino, K.
AU - Sagawa, H.
PY - 2007/10/2
Y1 - 2007/10/2
N2 - We analyze the Coulomb breakup cross sections of Li11 and He6 nuclei using a three-body model with a density-dependent contact interaction. We show that the concentration of the B(E1) strength near the threshold can be well reproduced with this model. With the help of the calculated B(E1) value, we extract the root-mean-square (rms) distance between the core nucleus and the center-of-mass of two valence neutrons without resorting to the sum rule, which may suffer from unphysical Pauli forbidden transitions. Together with the empirical rms distance between the neutrons obtained from the matter radius study and also from the three-body correlation study in the breakup reaction, we convert these rms distances to the mean opening angle between the valence neutrons from the core nucleus. We find that the obtained mean opening angles in Li11 and He6 agree with the three-body model predictions.
AB - We analyze the Coulomb breakup cross sections of Li11 and He6 nuclei using a three-body model with a density-dependent contact interaction. We show that the concentration of the B(E1) strength near the threshold can be well reproduced with this model. With the help of the calculated B(E1) value, we extract the root-mean-square (rms) distance between the core nucleus and the center-of-mass of two valence neutrons without resorting to the sum rule, which may suffer from unphysical Pauli forbidden transitions. Together with the empirical rms distance between the neutrons obtained from the matter radius study and also from the three-body correlation study in the breakup reaction, we convert these rms distances to the mean opening angle between the valence neutrons from the core nucleus. We find that the obtained mean opening angles in Li11 and He6 agree with the three-body model predictions.
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U2 - 10.1103/PhysRevC.76.047302
DO - 10.1103/PhysRevC.76.047302
M3 - Article
AN - SCOPUS:34948909076
VL - 76
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 4
M1 - 047302
ER -