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5H (59AJ76)(Not illustrated)
The possible existence of a particle-stable 5H is discussed by
(BL57B) who point out that a T = 3/2 level of
5He - 5Li might plausibly be formed by combination of 3H or
3He and a deuteron in the singlet (T = 1) state at an energy ~ 2.3 MeV higher than the known
16.7 - 16.8 MeV level. If such a level exists, calculation of Coulomb corrections and n - 1H
mass difference suggests a mass excess of 32.22 MeV for 5H, which would be 0.35 MeV stable
against 3H + 2n. Presumably 5H would then decay by β-emission (~ 19 MeV) followed by
neutron emission (BL57B). A search for delayed neutrons
from 7Li(γ, 2p)5H with 320-MeV bremsstrahlung yielded no
evidence of formation of 5H (TA58C). It
is concluded that less than 1% of the expected yield of 7Li(γ,
2p)5H leads to a particle-stable product (TA58C); see also (CE58). A reaction yielding 5H might be
3H(t, p)5H with Q ~ -8.1 MeV, assuming the mass of 5H given by (BL57B).
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