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GENERAL: See also (1974AJ01) and Table 9.12 [Table of Energy Levels] (in PDF or PS).

Model calculations: (1974IR04, 1976IR1B).

Pion reactions: (1974KA07, 1976HEZU, 1978SE1D).

Other topics: (1974IR04, 1975BE56, 1976IR1B, 1977CE05).

Ground state properties: (1975BE31).

Mass of ⁹C: The atomic mass excess of ⁹C is 28912 ± 3 keV (1975KA18) based on the Q-value of the ¹²C(³He, ⁶He)⁹C reaction (1971TR03) and the threshold energy of the ⁷Be(³He, n)⁹C reaction (1971MO01).

1. 9C(β+)9B → 8Be + p	Qm = 16.681
→ 5Li + α	Qm = 14.81

The half-life of ⁹C is 126.5 ± 1.0 msec (1971HA05, 1972ES05), 126.5 ± 2 msec (1971MO01). 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 (1974KU06, 1975WI1E; theor.).

2. 7Be(3He, n)9C

Qm = -6.282

E_thresh. = 8980 ± 5 keV (1971MO01).

3. 12C(3He, 6He)9C	Qm = -31.575
	Q0 = -31.578 ± 0.008 (1971TR03).

At E(³He) = 74.1 MeV a ⁶He group is observed to the first excited state whose atomic mass excess is measured to be 31.131 ± 0.011 MeV, Γ = 100 ± 20 keV. Based on the adopted AME for the ground state of ⁹C of 28.912 ± 0.003 MeV, E_x = 2.219 ± 0.011 MeV (1971BE66).

4. 14N(3He, 8Li)9C

Qm = -32.064

See 8Li (1976RO04).