Surface localization of the dineutron in ${}^{11}$Li

Abstract

The formation of a dineutron in the nucleus ${}^{11}$Li is found to be localized to the surface region. The experiment measured the intrinsic momentum of the struck neutron in ${}^{11}$Li via the $(p,pn)$ knockout reaction at 246 MeV/nucleon. The correlation angle between the two neutrons is, for the first time, measured as a function of the intrinsic neutron momentum. A comparison with reaction calculations reveals the localization of the dineutron at $r\sim 3.6$ fm. The results also support the density dependence of dineutron formation as deduced from Hartree-Fock-Bogoliubov calculations for nuclear matter.

arXiv comment19 pages, 4 figures. Accepted for Physical Review Letters

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• Opening angle and dineutron correlations in knockout reactions with Borromean two-neutron halo nuclei
• Drastic change in inelastic scattering depending on the development of dineutron correlation in ${}^{10}$Be
• A Vision for the Science of Rare Isotopes
• Search for a bound di-neutron by comparing ${}^3$He(e,e'p)d and ${}^3$H(e,e'p)X measurements
• Inclusive Breakup Cross Sections in Reactions Induced by the Nuclides ${}^6$He and ${}^{6,7}$Li in the Two-Body Cluster Model
• Effective polarization in proton-induced $\alpha$ knockout reactions
• Dineutron in the $2_1^{+}$ state of ${}^6$He
• Spin-triplet proton-neutron pair in spin-dipole excitations
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