Structure and decay correlations of two-neutron systems beyond the dripline

[摘要] The two-neutron unbound systems of16Be,13Li,10He, and26O have been measured using the Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet setup. The correlations of the 3-body decay for the6Be and3Li were extracted and demonstrated a strong correlated enhancement between the two neutrons. The measurement of the10He ground state resonance from a14Be(-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 the26O ground state. The measured lifetime of 4.5+1.1-1.5(stat.)±3(sys.) ps provides the first indication of two-neutron radioactivity.

[发布机构] National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing; MI; 48824, United States^1;Department of Chemistry, Michigan State University, East Lansing; MI; 48824, United States^2;Department of Physics and Astronomy, Michigan State University, East Lansing; MI; 48824, United States^3;Department of Physics, Hope College, Holland; MI; 49423, United States^4;Department of Physics, Central Michigan University, Mt. Pleasant; MI; 48859, United States^5;Department of Physics and Astronomy, Ohio Wesleyan University, Delaware; OH; 43015, United States^6;Department of Physics and Astronomy, Indiana University at South Bend, South Bend; IN; 46634, United States^7;Department of Physics and Astronomy, Augustana College, Rock Island; IL; 61201, United States^8;Department of Physics, Concordia College, Moorhead; MN; 56562, United States; (10) Department of Physics, Gettysburg College, Gettysburg; PA; 17325, United States; (11) Department of Physics, Florida State University, Tallahasee; FL; 32306, United States^9

[关键词] Decay energy;Sweeper magnets