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GENERAL: (See also (1979AJ01) for other references in this category and for some reactions on which no new work has been done.) and Table 9.12 [Table of Energy Levels] (in PDF or PS) here.

Model calculations: (1979LA06).

Complex reactions involving ⁹C: (1981MO20).

Reactions involing pions: (1979AS01, 1979NA1E, 1980BU15, 1983HU02).

Other topics: (1979BE1H, 1979LA06, 1982NG01).

Mass of ⁹C: The recent Q₀ value for the ¹²C(³He, ⁶He)⁹C reaction (see reaction 3) has not been published. We therefore adopt the Wapstra mass excess: 28913.1 ± 2.5 keV.

1. 9C(β+)9B	→ 8Be + p		Qm = 16.682
	→ 5Li + α		Qm = 14.81

The half-life of ⁹C is 126.5 ± 0.9 msec: see (1974AJ01). Several groups of delayed protons are observed indicating the involvement of a number of ⁹B states: see Table 9.10 (in PDF or PS) (1972ES05). See also (1978RA2A).

2. 9Be(π+, π-)9C

Qm = -3.959

⁹C_g.s. has been observed at E_π⁺ = 180 MeV (1980BU15). See also (1979NA1E).

3. 12C(3He, 6He)9C	Qm = -31.574
	Q0 = -31.5762 ± 0.0032: see (1980KA1J).

At E(³He) = 74.1 MeV a ⁶He group is observed to the first excited state of ⁹C (1974BE66). Based on Q_m, E_x = 2218 ± 11 keV and Γ = 100 ± 20 keV.