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USNDP

5Be (1974AJ01)


(See the Isobar Diagram for 5Be)

The absence of any group structure in the neutron spectrum in the reaction 3He(3He, n)5Be at E(3He) = 18.0 to 26.0 MeV indicates that 5Be(0) is at least 4.2 MeV unstable with respect to 3He + 2p [(M - A) > 33.7 MeV]. With Coulomb corrections adjusted to match the 16.7 MeV states of 5He - 5Li, this observation places the first T = 3/2 level in these nuclei above Ex = 21.4 MeV (1967AD05). [With the "conventional" correction (please refer to the Introduction in (1966LA04)) Ex > 20.3 MeV].

See also (1968CE1A, 1970WA1G).