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GENERAL: See also Table 15.1 [Table of Energy Levels] (in PDF or PS).

Mass of ¹⁵C: From the Q of the ¹⁴C(d, p)¹⁵C reaction given by (DO56C) (Q₀ = -1.007 ± 0.001 MeV), and using the Wapstra masses for ¹⁴C, d and ¹H, the mass excess of ¹⁵C is 14.305 ± 0.005 MeV. Application of Coulomb corrections indicates an excitation of 11.72 to 11.87 MeV for the first T = 3/2 state of ¹⁵N (BA56A, DO56B, MU57A).

1. 15C(β-)15N

Qm = 9.777

The half-life is 2.25 ± 0.05 sec. The β-spectrum is complex, with 32 ± 2 % of transitions (log ft = 6.0) to the ¹⁵N ground state (E_β(max) = 9.82 ± 0.04 MeV) and 68% (log ft = 4.1) to the upper of the 5.3 MeV levels of ¹⁵N. A 5.299 ± 0.006 MeV γ-ray is observed (AL59): no other γ-rays with E_γ > 5.3 MeV are observed with intensities > 5%, and the intensity of a 1.9 MeV γ-ray (expected if the ¹⁵N*(7.16) level were involved) is < 10% (DO56B). The internal pair conversion coefficient of the 5.30 MeV γ-ray is consistent with E1. All data are consistent with J = 1/2⁺ for the 5.305 MeV state in ¹⁵N and J = 1/2⁺ for ¹⁵C (AL59). See also (55AJ61, BA56A, DO56B).

2. 9Be(7Li, p)15C

Qm = 9.098

At E(⁷Li) = 2.0 MeV (θ = 90°) proton groups are observed corresponding to the ground state of ¹⁵C and to excited states at 0.62 ± 0.06, 2.48 ± 0.05, 3.08 ± 0.04, 4.26 ± 0.04, 5.93 ± 0.04, 6.58 ± 0.04, and 8.16 ± 0.06 MeV. The ground state Q is 9.04 ± 0.05 MeV (MU57A). In an earlier experiment, (NO57) found Q₀ = 9.05 ± 0.05 and Q₁ = 8.35 ± 0.05 MeV (E_x = 0.70 ± 0.05 MeV). Calculation of Coulomb and (n - ¹H) energy difference places the analogue state of ¹⁵N at 11.72 to 11.87 MeV. Identification with the known J = 1/2⁺; T = 3/2 level of ¹⁵N at 11.61 MeV supports J = 1/2⁺ for ¹⁵C_g.s. (BA56A, MU57A, NO57).

3. 14C(d, p)15C	Qm = -1.007
	Q0 = -1.007 ± 0.001 (DO56C).

Identification of ¹⁵C_g.s. with ¹⁵N*(11.62), J^π = 1/2⁺; T = 3/2, is suggested by (BA56A). Proton groups corresponding to the ground state and to levels at 0.7 ± 0.1 and 6.2 ± 0.15 MeV are reported by (MO58A). The weak activity previously reported at E_d < 1.3 MeV, indicating a Q ~ 0.1 MeV (see (55AJ61)), is now attributed to contamination (BO56B). See also ¹⁶N.

4. 14C(n, γ)15C

Qm = 1.220

The capture cross section is < 1 μb (YA51, HU55C, HU58).

The following reactions leading to ¹⁵C are not reported: ¹³C(t, p)¹⁵C (Q_m = 0.909), ¹⁴C(t, d)¹⁵C (Q_m = -5.039), ¹⁴C(α, ³He)¹⁵C (Q_m = -19.358), ¹⁵N(n, p)¹⁵C (Q_m = -8.994), ¹⁸O(n, α)¹⁵C (Q_m = -5.024).