Abstract
We study the two-neutron decay of the unbound nucleus with a three-body model assuming an inert core and two valence neutrons. We first discuss the importance of the neutron-neutron final state interaction in the observed decay energy spectrum. We then 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 dineutron correlation, with which the two neutrons are spatially localized before the emission.
- Received 21 July 2013
- Revised 30 October 2013
DOI:https://doi.org/10.1103/PhysRevC.89.014331
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