Two-Neutron Sequential Decay of ${}^{24}$O

Abstract

A two-neutron unbound excited state of ${}^{24}$O was populated through a (d,d') reaction at 83.4 MeV/nucleon. A state at $E=715\pm 110$ (stat) $\pm 45$ (sys) keV with a width of $\Gamma <2$ MeV was observed above the two-neutron separation energy placing it at 7.65 $\pm$ 0.2 MeV with respect to the ground state. Three-body correlations for the decay of ${}^{24}$O $\to$ ${}^{22}$O + $2n$ show clear evidence for a sequential decay through an intermediate state in ${}^{23}$O. Neither a di-neutron nor phase-space model for the three-body breakup were able to describe these correlations.

References in corpus (4)

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• Reconstruction of nuclear charged fragment trajectories from a large gap sweeper magnet
• Neutron occupancy of the 0d5/2 orbital and the N=16 shell closure in 24O

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• Chronology of the three-body dissociation of ${}^8$He
• The Gamow-state description of the decay energy spectrum of neutron-unbound ${}^{25}$O
• Nuclear ground states in a consistent implementation of the time-dependent density matrix approach