Speaker
Prof.
Toshio Suzuki
(Department of Physics, College of Humanities and Sciences, Nihon University)
Description
The formation of two-neutron halo is described using the neutron-neutron ($nn$) interaction fixed at the low-energy $nn$ scattering limit [1]. This method is tested for loosely-bound two neutrons in $^{24}$O, where a good agreement with experimental data is found. It is applied to halo neutrons in $^{22}$C in two ways: with the $^{20}$C core being closed or correlated due to excitations from the closed core. This $nn$ interaction is shown to be strong enough to produce a two-neutron halo in both cases, locating $^{22}$C on the drip line, while $^{21}$C remains unbound. A unique relation between the two neutron separation energy, $S_{2n}$ and the radius of neutron halo is presented. New predictions for $S_{2n}$ and the radius of neutron halo are given for $^{22}$C. The appearance of Efimov states is also discussed. Spectra of excited states in $^{22}$C are predicted.
[1] T. Suzuki, T. Otsuka, C. Yuan and N. Alahari, Phys. Lett. B 753, 199 (2016).
Primary author
Prof.
Toshio Suzuki
(Department of Physics, College of Humanities and Sciences, Nihon University)
Co-authors
Dr
Cenxi Yuan
(Sino-French Institute of Nuclear Engneering and Technology)
Prof.
Navin Alahari
(GANIL, CEA/DSM-CNRS/IN2P3)
Prof.
Takaharu Otsuka
(Department of Physics, University of Tokyo)
