Dipole excitation and geometry of Borromean nuclei
- Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
- Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8560 (Japan)
We analyze the Coulomb breakup cross sections of {sup 11}Li and {sup 6}He 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 {sup 11}Li and {sup 6}He agree with the three-body model predictions.
- OSTI ID:
- 21067851
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevC.76.047302; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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