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<i>Ab initio</i> no-core solutions for <sup>6</sup>Li
Shin, Ik Jae,Kim, Youngman,Maris, Pieter,Vary, James P,Forssé,n, Christian,Rotureau, Jimmy,Michel, Nicolas IOP 2017 Journal of physics G, Nuclear and particle physics Vol.44 No.7
<P>We solve for properties of <SUP>6</SUP>Li in the <I>ab initio</I> no-core full configuration (NCFC) approach and we separately solve for its ground state and <img ALIGN='MIDDLE' ALT='${J}^{\pi }={2}_{2}^{+}$' SRC='http://ej.iop.org/images/0954-3899/44/7/075103/jpgaa6cb7ieqn1.gif'/> resonance with the Gamow shell model (GSM) in the Berggren basis. We employ both the JISP16 and chiral <img ALIGN='MIDDLE' ALT='${\mathrm{NNLO}}_{\mathrm{opt}}$' SRC='http://ej.iop.org/images/0954-3899/44/7/075103/jpgaa6cb7ieqn2.gif'/> realistic nucleon–nucleon interactions and investigate the ground state energy, excitation energies, point proton root mean square (rms) radius and a suite of electroweak observables. We also extend and test methods to extrapolate the ground state energy, point proton rms radius, and electric quadrupole moment. We attain improved estimates of these observables in the NCFC approach by using basis spaces up through <img ALIGN='MIDDLE' ALT='${N}_{\max }=18$' SRC='http://ej.iop.org/images/0954-3899/44/7/075103/jpgaa6cb7ieqn3.gif'/> that enable more definitive comparisons with experiment. Using the density matrix renormalization group approach with the JISP16 interaction, we find that we can significantly improve the convergence of the GSM treatment of the <SUP>6</SUP>Li ground state and <img ALIGN='MIDDLE' ALT='${J}^{\pi }={2}_{2}^{+}$' SRC='http://ej.iop.org/images/0954-3899/44/7/075103/jpgaa6cb7ieqn4.gif'/> resonance by adopting a natural orbital single-particle basis.</P>