Study of Two-Neutron Radioactivity in the Decay of O-26
A new technique was developed to measure the lifetimes of neutron unbound nuclei in the picosecond range. The decay of 26O→24O+n+n was examined as it had been predicted to have an appreciable lifetime due to the unique structure of the neutron-rich oxygen isotopes. The half-life of 26O was extracted as 4.5-1.5+1.1(stat)±3(syst) ps. This corresponds to 26O having a finite lifetime at an 82% confidence level and, thus, suggests the possibility of two-neutron radioactivity.
Kohley, Z, T Baumann, D Bazin, G Christian, Paul A. DeYoung, J E. Finck, N Frank, M Jones, E Lunderberg, B Luther, S Mosby, T Nagi, J K. Smith, J Snyder, A Spyrou and M Thoennessen. "Study of Two-Neutron Radioactivity in the Decay of O-26." Physical Review Letters 110, no. 15 (2013). http://dx.doi.org/10.1103/PhysRevLett.110.152501