Data from AR_93034_6.ens

The ⁹Be(¹¹B,¹⁵O) reaction at E(¹¹B)=52-76 MeV shows no evidence for the formation of ⁵H (1986Be35,1987Bo40). For the earlier work see 1984Aj01,1987Ko47 and 1988SeZJ. There is some evidence in the ⁹Be(π^-,p+t) reaction for the formation of a very broad, 8 MeV 3, resonance in ⁵H that is 7.4 MeV above the ground state resonance (see 1987Go25 and 1991Go19). Measurements of ⁶Li(π^-,p) reported in 1990Am04 provide evidence for a resonance 11.8 MeV 7, above the ground state, Γ=5.6 MeV 9. A resonance 9.1 MeV 7 above the ground state, Γ=7.4 MeV 6, was reported in ⁷Li(π^-,d) also by 1990Am04. References cited in 2002Ti10 report work on ⁶Li(π^-,p) that included a broad, Γ=14 MeV, resonance 11.1 MeV 15 above the ground state. Work on ⁷Li(⁶Li,⁸B)⁵H described in 1995AlZU reported evidence for an unstable ⁵H nucleus at 5.2 MeV 4 above the ³H + 2n threshold. A resonance 1.1 MeV 0.4 above the ³H + 2n threshold is reported in 1997Ko07. A dineutron-containing breakup channel is reported in 1991Se06.

⁵H is calculated to have Jπ=1/2+, to be unstable with respect to two-neutron emission and to have excited states at E(x)=2.44, 4.29 and 7.39 MeV with Jπ=5/2+, 3/2+ and 3/2+ in (0+1) h\ℓω model space, while (0+2) h\ℓω model space yields E(x)=2.85, 3.46 and 6.02 MeV with Jπ=3/2+, 5/2+ and 3/2+ (1985Po10). See also 1982Sm09, 1986Be44 and 1983AnZQ.