Trajectory of neutron$-$neutron$-^{18}C$ excited three-body state

Details Trajectory of neutron$-$neutron$-^{18}C$ excited three-body state Trajectory of neutron$-$neutron$-^{18}C$ excited three-body state

2007-04-11

arxiv.org/abs/0704.1461v4

Phys.Lett.B660:339-344,2008

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1016/j.physletb.2008.01.008

The trajectory of the first excited Efimov state is investigated by using a renormalized zero-range three-body model for a system with two bound and one virtual two-body subsystems. The approach is applied to $n-n-^{18}$C, where the $n-n$ virtual energy and the three-body ground state are kept fixed. It is shown that such three-body excited state goes from a bound to a virtual state when the $n-^{18}$C binding energy is increased. Results obtained for the $n-^{19}$C elastic cross-section at low energies also show dominance of an $S-$matrix pole corresponding to a bound or virtual Efimov state. It is also presented a brief discussion of these findings in the context of ultracold atom physics with tunable scattering lengths.

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