(See Energy Level Diagrams for 14B)
14B has a half-life of 16.1 ± 1.2 ms (1974AL11), 12.8 ± 0.8 ms (1986CU01): the weighted mean is 13.8 ± 1.0 ms and we adopt it. The nature of the decay [see Table 14.2 (in PDF or PS)] fixes Jπ of 14B to be 2- (1974AL11). See also (1989PO1K; theor.).
A single strong transition is observed in this pion capture cross section to a state in 14B at Ex = 2.15 ± 0.17 MeV, Γ = 1.0 ± 0.5 MeV, with Jπ = 2-. The relative branching ratio of the ground state [2-] to this second 2- state is < 0.1. The data are also suggestive of the population of 2- and 1- states in the Ex = 5 - 7 MeV region (1983BA36).
14B states with 0 < Ex < 3 MeV have been populated in this reaction at E(7Li) = 52 MeV: see Table 14.1 (in PDF or PS). Similarities in the relative intensities of 14B*(0, 0.74, 1.38, 1.82, 2.08) and of 12B*(1.67, 2.62, 3.39, 4.30, 4.52) [populated in 12C(7Li, 7Be)12B], and the similarity in the ΔEx of these 12B states with the Ex of the 14B states suggest that they have the same Jπ (1973BA34).
The work quoted in (1986AJ01) has not been published.