Two-dimensional extrapolation procedure for an <i>ab initio</i> study of nuclear size parameters and the properties of the halo nucleus <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>6</mml:mn></mml:mmultiscripts></mml:math>

A new two-dimensional procedure for extrapolation of the values matter, neutron, and proton radii obtained in no-core shell model (NCSM) calculations to infinite size its basis is proposed. relationship between used as an additional test. Together with JISP16 potential, which frequently NCSM radii, Daejeon16 potential applied these purposes first time. Halo nucleus 6He object studies. The small spread values, successful testing using three reasonable agreement results experimental data well other advanced ab initio demonstrate high efficiency developed approach and, therefore, good prospects application. performed investigations analysis studies indicate that halo has a large 0.7 - 0.8 fm.