[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

[TRIUMF Seminars]

Date/Time: Tue 2012-05-15 at 13:00

Location:  Theory Room         

Speaker:   George Papadimitriou (UofA)

Title:     Gamow Shell Model as a tool to describe unbound and weakly bound nuclear states"

Abstract: Spatial correlations between halo neutrons in $^{6,8}$He are studied within  the complex-energy Gamow Shell Model (GSM). To this end, I calculate the neutron and proton radii, and  two-neutron correlations in a large shell model  space consisting of the $0p_{3/2}$ resonance and non-resonant $psd$ scattering continuum. The two-body force employed is the Minnesota interaction.
The calculated charge radii, corrected for the core polarization and spin-orbit effects,  are compared to the values extracted from measured atomic isotope shifts.
It is found that the charge radius of $^{6}$He primarily depends on the two-neutron separation energy.
It is  confirmed that the ground-state GSM wave function of $^{6}$He
is dominated by the $S$=0 component representing a di-neutron structure. On the other hand, the correlation density of the  2$^+_1$ resonance in $^6$He indicates a very weak di-neutron correlations in this state. 
Finally I apply the GSM in an ab-initio framework (all nucleons are active) in 3H, 3He, 4He and 5He using realistic two-body interactions (AV18 and Chiral N3LO) which are renormalized via a Vlowk technique.



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