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5H (1959AJ76)

(Not illustrated)

The possible existence of a particle-stable 5H is discussed by (1957BL1A) 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 (1957BL1A). A search for delayed neutrons from 7Li(γ, 2p)5H with 320-MeV bremsstrahlung yielded no evidence of formation of 5H (1958TA1A). It is concluded that less than 1% of the expected yield of 7Li(γ, 2p)5H leads to a particle-stable product (1958TA1A); see also (1958CE1A). A reaction yielding 5H might be 3H(t, p)5H with Q ≈ -8.1 MeV, assuming the mass of 5H given by (1957BL1A).