Two-nucleon Correlations in the Decay of Unbound Nuclei beyond the Drip Lines

Abstract

We discuss the two-neutron emission decay of ${}^{26}$O nucleus from a viewpoint of dineutron correlations between the valence neutrons. We first discuss how the dineutron correlation is realized both in the coordinate space and in the momentum space by employing a three-body model. We then discuss the decay energy spectrum as well as the angular distribution of emitted neutrons. We show that an emission of two neutrons in back-to-back directions is enhanced, which we interpret as a clear manifestation of the dineutron correlation between the valence neutrons.

Comments: 6 pages, 5 eps figures. A talk given at 2nd conference on Advances in Radioactive Isotope Science (ARIS2014), June 1-6, 2014, Tokyo, Japan