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

See (TA60L, TA62F, LI64I, ST64, LO67E). See also (AR69E).

1. 15C(β-)15N

Qm = 9.773

The half-life is 2.25 ± 0.05 sec (DO56B), 2.49 ± 0.07 sec (NE64F). The β-spectrum is complex. Transitions have been observed both to the ground state and to the upper of the 5.3 MeV levels of ¹⁵N: the latter transition is clearly allowed: see Table 15.2 (in PDF or PS) (AL59F, AL66C, GA69E). The ground state transition of ¹⁵N*(5.3) has E_γ = 5.29903 ± 0.00043 MeV (CH67I); J^π for this state is 1/2⁺ (see Table 15.4 (in PDF or PS)). Thus J^π(¹⁵C) = 1/2⁺ or 3/2⁺ (AL59F, AL64K: see also (WA65B)). See also (KI63E, ZH68) and ¹⁵N.

2. 9Be(6He, α)11Be

Qm = 6.343

Eb = 19.076

⁹Be was irradiated with 14 MeV neutrons and the decay of ¹¹Be was observed [⁹Be(n, α)⁶He, followed by the above reaction]: the cross section (which is determined for a large ⁶He energy spread) is 11 ± 10 mb (ST67J).

3. 9Be(7Li, p)15C

Qm = 9.095

Observed proton groups are listed in Table 15.3 (in PDF or PS) (MU57A, CA64A). τ_m for ¹⁵C*(0.75) is (3.77 ± 0.11) nsec (ME68B: delayed coincidence technique). Angular distributions of the protons to ¹⁵C*(0, 0.75) are reported at E(⁷Li) = 5.6, 5.8, 6.0, 6.2 MeV by (SN69B).

4. 14C(d, p)15C

Qm = -1.006

Identification of ¹⁵C_g.s. with ¹⁵N*(11.62), T = 3/2, J^π = 1/2⁺, is suggested by (BA56A). At E_d = 14.9 MeV, proton groups are observed to the ground state of ¹⁵C and to the levels at 0.75, 3.09, 4.21, 5.94, 6.38 and 7.32 MeV (± 30 keV) (MO59A). The angular distribution of ground state protons implies l_n = 0, J^π = 1/2⁺ (MO59A: see also (PU61) and ref. ⁹ there, (AL64K)); for the first excited state, l_n = 2. θ² = 0.093 and 0.032 (MO59A), 0.16 and 0.063 (GL66C) for the ground state and the first excited state, respectively. See also (NE67A).

The 0.75 MeV level has a mean life of 3.73 ± 0.23 nsec (LO62); E_γ = 750 ± 7 keV. The angular distribution of the γ-rays requires J >/= 5/2. Since the l_n = 2 stripping requires J^π = 3/2⁺ or 5/2⁺, J^π = 5/2⁺ is established (CH62B). The observed lifetime excludes J > 5/2 (LO62). See also (NE64F, WA65B, AL66C, CH67I).

5. 14C(n, γ)15C

Qm = 1.218

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

6. 18O(n, α)15C

Qm = -5.009

See (BA66KK).

The following reactions leading to ¹⁵C have not been reported:

13C(t, p)15C	Qm = 0.912
14C(t, d)15C	Qm = -5.039
14C(α, 3He)15C	Qm = -19.360
15N(n, p)15C	Qm = -8.990