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

K. Hagino1 and H. Sagawa2,3

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2Center for Mathematics and Physics, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8560, Japan
  • 3RIKEN Nishina Center, Wako 351-0198, Japan

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Phys. Rev. C 89, 014331 – Published 31 January, 2014

DOI: https://doi.org/10.1103/PhysRevC.89.014331

Abstract

We study the two-neutron decay of the unbound 26O nucleus with a three-body model assuming an inert 24O 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.

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Information

Phys. Rev. C 89, 014331– Published 31 January, 2014
  • Received 21 July 2013
  • Revised 30 October 2013

©2014 American Physical Society

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