Abstract
One of the aims of this work is to investigate a two-dineutron condensate state in 8He and to discuss the properties of two dineutrons in that state. We suggest that the excited 8He(0+) state that is the candidate for the two-dineutron condensation would exist above the α + 4n threshold energy by a few MeV and this state contains two compact dineutrons in the lowest S-wave around an α core. Different from a clusters, dineutron clusters in that state is soft in size changing, because two neutrons are not bound in free space and dineutron correlation becomes weak in the low-density structure of the dineutron condensation.
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