1304.4901 (L. V. Grigorenko et al.)

Lifetime and fragment correlations for the two-neutron decay of $^{26}$O
ground state    [PDF]

L. V. Grigorenko, I. G. Mukha, M. V. Zhukov

The structure and decay of $^{26}$O are studied in a three-body $^{24}$O+$n+n$ model. We have found extremely strong effect of the subbarrier configuration mixing on the width of true $2n$ emitters due to core recoil and neutron-neutron final state interaction. This effect is far exceeding analogous effect in the true $2p$ emitters. Our calculations provide reasonably narrow boundaries for the lifetime vs.\ decay energy dependence for the true $2n$ emission. An upper limit of $\sim 1$ keV for the decay energy of the unbound $^{26}$O is inferred basing on the recent experimental lifetime value.

View original: http://arxiv.org/abs/1304.4901