Measured Ground-State Γ_cm for ¹²O

Adopted value: < 72 keV (2012JA11)

Measured Mass Excess for ¹²O

Adopted value: 31915 ± 14 keV (2017WA10)

1978KE06: ¹⁶O(α, ⁸He), E = 117 MeV; measured σ(θ); deduced Q. ¹²O deduced mass excess, Γ_cm, diproton decay.

1980BU15: ¹²C(π⁺, π^-), E = 180 MeV; measured σ(θ), Q. ¹²O deduced masses.

1980MOZX: ¹²C(π⁺, π^-), E = 180 MeV; measured mass spectra, θ = 5°. ¹²O deduced masses.

1986FAZY: ¹²C(π⁺, π^-), E = 50, 60, 80, 100, 120 MeV; measured σ(θ = 35°). ¹²O deduced double IAS excitation.

1995KR03: ¹²O(2p) [from ⁹Be(¹³O, ¹²O), secondary beam from ⁹Be(¹⁶O, X), projectile fragmentation]; measured (2p)(¹²C)-coin decay energy; deduced ²He emission upper limit, branching ratio.

1995KR24: ⁹Be(¹³O, ¹²O), E = 33.4 MeV/nucleon; measured (¹⁰C)(2p)-coin events relative energy, (¹⁰C)(2p)(θ) following ejectile breakup; deduced ejectile breakup mechanism related features. ¹²O deduced no ²He emission evidence.

1995THZZ: ⁹Be(¹³O, ¹²O), E not given; measured (fragment)(2p)-coin. ¹²O(2p) [from ⁹Be(¹³O, ¹²O)]; measured decay energy spectrum; deduced sequential decay.

1998AZ03: ¹²O(2p); analyzed two-proton decay data; deduced sequential proton emission.

2002LE16: ¹²C(¹⁴N, ¹⁴B), E = 30 MeV/nucleon; measured particle spectra.

2006ANZV: ^{1, 2}H(¹⁰C, p), E = 25.5 MeV; measured E_p, σ(θ). ¹²O deduced upper limit for two-proton decay width.

2006CA05: ¹H(¹⁰C, p), E = 25.5, 32 MeV; measured recoil E_p, elastic σ(θ). ¹²O deduced two-proton decay width.

2009SU14: ¹⁴O(p, t), E = 51 MeV/nucleon; measured E_t, I_t; deduced an excited state, σ, breakdown of Z = 8 shell closure.

2010SUZZ: ¹H(¹⁴O, t), E = 51 MeV/nucleon; measured triton E, I. ¹²O deduced new excited unbound state using missing-mass spectroscopy.

2012JA11: ¹²O(2p), E = 30.3 MeV/nucleon; measured total excitation energy spectra for decay of g.s. of ¹²O; deduced mass excesses using the invariant mass method.

2012SU21: ¹H(¹⁴O, ¹²O), E = 51 MeV/nucleon; ¹²O deduced levels, J, π, spectroscopic factor.

2016SU05: ¹H(¹⁴O, t), E = 51 MeV/nucleon; measured E(t), I(t), σ(θ), ¹²O; deduced levels, J, π, L-transfers, two-proton decay width.

2019WE03: ¹²O(2p); measured decay products, E_p, I_p; deduced an invariant-mass spectrum, resonant state widths, two-nucleon density distributions.

2019WE11: ⁹Be(¹³O, ¹²O), E = 69.5 MeV/nucleon; measured charged particles, (particle)(particle)-coin, cross sections. ¹²O; deduced levels, J, π, 2p-, 1p- and 2p + α-decay branches, 2p + ¹⁰C invariance mass spectra, widths, total decay energy spectrum and invariant-mass spectra from coincident 4p + 2α events.

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Last modified: 30 June 2021