Dipole excitation and geometry of Borromean nuclei

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.047302· OSTI ID:21067851

Hagino, K ^[1]; Sagawa, H ^[2]

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1. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
2. 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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BREAKUP REACTIONS
CORRELATIONS
COULOMB EXCITATION
CROSS SECTIONS
DIPOLES
E1-TRANSITIONS
FORBIDDEN TRANSITIONS
HELIUM 6
LITHIUM 11
NEUTRONS
STRENGTH FUNCTIONS
SUM RULES
THREE-BODY PROBLEM
VALENCE