title: How Many-Body Correlations and α Clustering Shape ^{6}He.
abstract: The Borromean ^{6}He nucleus is an exotic system characterized by two halo neutrons orbiting around a compact ^{4}He (or α) core, in which the binary subsystems are unbound. The simultaneous reproduction of its small binding energy and extended matter and point-proton radii has been a challenge for ab initio theoretical calculations based on traditional bound-state methods. Using soft nucleon-nucleon interactions based on chiral effective field theory potentials, we show that supplementing the model space with ^{4}He+n+n cluster degrees of freedom largely solves this issue. We analyze the role played by α clustering and many-body correlations, and study the dependence of the energy spectrum on the resolution scale of the interaction.
authors.affiliation: Lawrence Livermore National Laboratory, P.O. Box 808, L-414, Livermore, California 94551, USA.
authors.forename: Carolina
authors.initials: C
authors.lastname: Romero-Redondo
authors.affiliation: Lawrence Livermore National Laboratory, P.O. Box 808, L-414, Livermore, California 94551, USA.
authors.forename: Sofia
authors.initials: S
authors.lastname: Quaglioni
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: Petr
authors.initials: P
authors.lastname: Navrátil
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Hupin