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USNDP

5H (1979AJ01)


(See the Isobar Diagram for 5H)

From the work of (1967AD05) on the 3He(3He, n)5Be reaction (see 5Be) it follows that 5H is unstable by more than 2.1 MeV to decay into 3H + 2n (using Coulomb corrections based on the 16.7 MeV states in 5He - 5Li). A study of 9Be(α, 8B)5H at Eα = 129 MeV shows no evidence for sharp 5H states for several MeV above 3H + 2n (1968MC02). In 3H(t, p)5H, at Et = 22.25 MeV, a broad peak appears in the proton spectrum which may correspond to a 5H state at 3H + 2n + 1.8 MeV, but which could also result from a four-body breakup (1968YO06). A recent study of the 7Li(6Li, 8B)5H reaction at E(6Li) = 93.3 MeV shows no evidence for the formation of a narrow 5H ground state: at θlab = 14.7° the yield near the predicted location of the 5Hg.s., above the phase-space curve, is ≈ 100 nb/sr. MeV compared to an order of magnitude greater yield for the final state interaction in 4H (1977WE03, 1977WE1B). Attempts to observe 5H formation in 7Li + π- have also been unsuccessful: see (1974AJ01). See also (1975BE31; theor.).