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14B (1986AJ01)
(See Energy Level Diagrams for 14B)
GENERAL: See also (1981AJ01) and Table 14.1 [Table of Energy Levels] (in PDF or PS) here.
Nuclear models: (1981SE06, 1984VA06).
Complex reactions involving 14B: (1983WI1A, 1984HI1A).
Pion capture and reactions: (1983TR1J).
Hypernuclei: (1981WA1J, 1982KA1D, 1983FE07).
Other topics: (1984PO11).
Ground state of 14B: (1983ANZQ).
Mass of 14B: We adopt the Wapstra atomic mass excess for 14B: 23664 ± 21 keV. See also (1981NAZQ).
| 1. 14B(β-)14C | Qm = 20.64 |
14B has a half-life of 16.1 ± 1.2 msec. The β- decay is primarily to 14C*(6.09, 6.73): see Table 14.2 (in PDF or PS). The nature of the decay fixes the Jπ of 14B to be 2-.
| 2. 14C(π-, γ)14B | Qm = 118.92 |
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).
| 3. 14C(7Li, 7Be)14B | Qm = -21.51 |
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). See also (1982AL1G, 1984GL1G).
| 4. 14C(14C, 14N)14B | Qm = -20.49 |
At E(14C) = 87.4 MeV the ground state of 14B is observed: the atomic mass excess is 23.67 ± 0.03 MeV. The differential cross section (θ = 4° - 8°) is 7 μb/sr. The previously reported excited state at 0.74 MeV is not observed (1981NAZQ).