Dineutron structure in 8He
Abstract
The ground and excited states of 8He were investigated with a method of antisymmetrized molecular dynamics(AMD). We adopted effective nuclear interactions which systematically reproduce the binding energies of 4He, 6He and 8He. The ground state of 8He has both the j-j coupling feature(p3/2 closure) and the L-S coupling feature(4He+2n+2n) with a slight tail of dineutron at the long distance region. The theoretical results give an indication of the 0+2 state with dineutron gas-like structure. The dineutron structure, 4He+2n+2n, of this state is similar to the 3α-cluster structure of the 12C(0+2) state which has been interpreted as an α condensate state. Since the 8He(0+2) state has a significant overlap with the dineutron condensate wave function where two dineutrons are moving in S wave around the α core with a dilute density, we suggest that this theoretically predicted 0+2 state is a candidate of the dineutron condensate state.
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