Correlated two-neutron emission in the decay of unbound nucleus 26O

Abstract

The particle unbound ${}^{26}$O nucleus is located outside the neutron drip line, and spontaneously decays by emitting two neutrons with a relatively long life time due to the centrifugal barrier. We study the decay of this nucleus with a three-body model assuming an inert ${}^{24}$O core and two valence neutrons. We first point out the importance of the neutron-neutron final state interaction in the observed decay energy spectrum. We also show that the energy and and angular distributions for the two emitted neutrons manifest a clear evidence for the strong neutron-neutron correlation in the three-body resonance state. In particular, we find an enhancement of two-neutron emission in back-to-back directions. This is interpreted as a consequence of {\it dineutron correlation}, with which the two neutrons are spatially localized before the emission.

5 pages, 4 figures

References in corpus (10)

• Spin-orbit splitting and the tensor component of the Skyrme interaction
• Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O
• Generic strong coupling behavior of Cooper pairs in the surface of superfluid nuclei
• Study of two-neutron radioactivity in the decay of 26O
• Three-body decay of ${}^6$Be
• Geometry of Borromean Halo Nuclei
• Lifetime and fragment correlations for the two-neutron decay of ${}^{26}$O ground state
• Dipole excitation and geometry of borromean nuclei
• First observation of ${}^{13}$Li ground state
• Two-particle correlations in continuum dipole transitions in Borromean nuclei

Cited by in corpus (22)

• Recent Progress in Two-proton Radioactivity
• The observation of long-range three-body Coloumb effects in the decay of 16Ne
• Two-proton emission and related phenomena
• Fermion Pair Dynamics in Open Quantum Systems
• Continuum effects in neutron-drip-line oxygen isotopes
• Dependence of two-proton radioactivity on nuclear pairing models
• Single-particle and collective motion in unbound deformed ${}^{39}\text{Mg}$
• Decay dynamics of the unbound ${}^{25}$O and ${}^{26}$O nuclei
• Three-body correlations in the ground-state decay of 26O
• Three-body model for the two-neutron decay of ${}^{16}$Be
• Nucleon-nucleon correlations in the extreme oxygen isotopes
• Exploring manifestation and nature of a dineutron in two-neutron emission using a dynamical dineutron model
• Search for excited states in ${}^{25}$O
• Searching for universality of dineutron correlation at the surface of Borromean nuclei
• Three-body model calculation of the 2${}^{+}$ state in ${}^{26}$O
• Magnetic dipole excitation and its sum rule in nuclei with two valence nucleons
• An artificial boundary approach for short-ranged interactions
• Collapse of N$=$28 magicity in exotic ${}^{40}$Mg -- Probe of deformed halo and 2n-radioactivity at Mg neutron drip-line
• Dineutron in the $2_1^{+}$ state of ${}^6$He
• Description of continuum structures in a discrete basis: Three-body resonances and two-nucleon decays
• Beyond the neutron-drip line: two-neutron decay of unbound nuclei
• Neutron-pair structure in the continuum spectrum of ${}^{26}$O