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GENERAL: See also (76AJ04) and Table 14.1 [Table of Energy Levels] (in PDF or PS).

See (FE75E, AR77B, KI79Q).

Mass of ¹⁴B: The atomic mass excess of ¹⁴B is 23.644 ± 0.027 MeV, based on the mean of the values reported by (BA73L) and (NA80).

T = 2 states of A = 14: On the basis of the mass of ¹⁴B, the lowest T = 2 states in ¹⁴C, ¹⁴N and ¹⁴O are estimated to lie at E_x = 22.5, 24.8 and 22.5 MeV (BA73L).

1. 14B(β-)14C

Qm = 20.62

¹⁴B has a half-life of 16.1 ± 1.2 msec. The β-decay is primarily to ¹⁴C*(6.09) [J^π = 1^-] and (6.73) [J^π = 3^-]: see Table 14.2 (in PDF or PS). The measured γ-ray intensity ratios are I_6.09/I_6.73/I_7.34 = 100/(10.0 ± 2.0)/< 2.2. The nature of the decay fixes the J^π of ¹⁴B to be 2^- (AL74).

2. 10Be(6Li, 2p)14B

Qm = -11.53

¹⁴B has been populated in this reaction at E(⁶Li) = 31 MeV (AL74).

3. 14C(7Li, 7Be)14B

Qm = -21.49

¹⁴B states with 0 < E_x < 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, 4.37, 4.52) [populated in ¹²C(⁷Li, ⁷Be)¹²B], and the similarity in the ΔE_x of these ¹²B states with the E_x of the ¹⁴B states suggest that they have the same J^π (BA73L).

4. 14C(14C, 14N)14B

Qm = -20.47

At E(¹⁴C) = 87.4 MeV, the ground state of ¹⁴B is observed: the atomic mass excess is 23.59 ± 0.06 MeV. The first excited state is not populated (NA80).