Information on mass chains and nuclides

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GENERAL: See (1955AJ61, 1956SW77, 1964GR1J, 1964WI1B, 1965JA1C, 1965WO01).

Mass of ⁹C: The atomic mass excess of ⁹C is 28.99 ± 0.07 MeV: see ¹²C(³He, ⁶He)⁹C (1965CE1A).

1. 9C(β+)9B → 8Be + p

Qm = 16.76

Two groups of delayed protons are observed, indicating a component of the β⁺ decay to a level of ⁹B at 12.05 ± 0.2 MeV with Γ = 800 ± 100 keV which then decays to p + ⁸Be(0) and ⁸Be*(2.9). The half-life is 127 ± 3 msec. The allowed character of the decay suggests J^π = 1/2^-, 3/2^- or 5/2^- for the ⁹B state, assuming the ⁹C(0) has J^π = 3/2^-. The near equality of intensity of the two proton groups to ⁸Be(0) and ⁸Be*(2.9) favors J^π = 1/2^- for ⁹B*(12.1) (1965HA09). See also (1961DA14).

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

Qm = -6.36

Not reported.

3. 12C(3He, 6He)9C

Qm = -31.66

At E(³He) = 65 MeV, the transition to the ground state of ⁹C has been observed with a differential cross section of ≈ 1.5 μb/sr for θ = 16° - 26° (1964CE04). The mass excess of ⁹C is 28.99 ± 0.07 MeV (1965CE1A).

4. 10B(p, 2n)9C

Qm = -25.79

The threshold energy is ≈ 29 MeV (1965RO1G). See also (1965HA09).

5. 11B(p, 3n)9C

Qm = -37.25

See (1965HA09).

6. 12C(p, d2n)9C

Qm = -50.98

The threshold energy is 52 ± 3 MeV (1965HA09).