Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-08-22
Phys.Lett.B670:49-54,2008
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
10.1016/j.physletb.2008.10.030
The low-energy neutron$-^{19}$C scattering in a neutron-neutron-core model is studied with large scattering lengths near the conditions for the appearance of an Efimov state. We show that the real part of the elastic $s-$wave phase-shift ($\delta_0^R$) presents a zero, or a pole in $ k\cot\delta_0^{R}$, when the system has an Efimov excited or virtual state. More precisely the pole scales with the energy of the Efimov state (bound or virtual). We perform calculations in the limit of large scattering lengths, disregarding the interaction range, within a renormalized zero-range approach using subtracted equations. It is also presented a brief discussion of these findings in the context of ultracold atom physics with tunable scattering lengths.
Frederico Tobias
Tomio Lauro
Yamashita M. T.
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