Abstract
The two-neutron unbound systems of 16Be, 13Li, 10He, and 26O have been measured using the Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet setup. The correlations of the 3-body decay for the 6Be and 3Li were extracted and demonstrated a strong correlated enhancement between the two neutrons. The measurement of the 10He ground state resonance from a 14Be(-2p2n) reaction provided insight into previous predictions that wavefunction of the entrance channel, projectile, can influence the observed decay energy spectrum for the unbound system. Lastly, the decay-in-target (DiT) technique was utilized to extract the lifetime of the 26O ground state. The measured lifetime of 4.5+1.1−1.5(stat.)±3(sys.) ps provides the first indication of two-neutron radioactivity.
Highlights
The addition or removal of neutrons from stable isotopes has been shown in many cases to drastically alter the structure and properties of the nucleus [1,2,3,4,5,6]
Goldansky was the first to propose that the simultaneous emission of two protons could be observed given a scenario in which the intermediate state was positioned above the initial state [7]
The recent two-neutron decay studies of the Modular Neutron Array (MoNA) collaboration have examined the 3-body decay correlations resulting from the two-neutron emission from the ground states of 16Be and 13Li, the predicted entrance-channel effects of populating neutron unbound systems from halo nuclei in population of 10He from 14Be, and the possibility for two-neutron radioactivity within the 26O system
Summary
The addition or removal of neutrons from stable isotopes has been shown in many cases to drastically alter the structure and properties of the nucleus [1,2,3,4,5,6]. The measurement of the 10He ground state resonance from a 14Be(−2p2n) reaction provided insight into previous predictions that wavefunction of the entrance channel, projectile, can influence the observed decay energy spectrum for the unbound system.
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