Ground-State Decay Evaluated Data

Measured Ground-State Γcm(T1/2) for 9He

Adopted value: 7 ± 4 zs (2003AU02)
Measured Mass Excess for 9He

Adopted value: 40939 ± 29 keV (2003AU02)

1980SEZX: 9Be(π-, π+), E = 194 MeV. measured 9He mass excess.
1980SEZZ: 9Be(π-, π+), E = 194 MeV; measured breakup σ. 9He deduced mass, neutron decay, B(n).
1987BEYI: 9Be(14C, 14O), E = 158 MeV; measured σ(E(14O)). 9He deduced levels, Γ.
1987BO40: 9Be(14C, 14O), Ecm = 61.83 MeV; measured energy spectra, σ(θ). 9He deduced levels, Γ.
1987SE05: 9Be(π-, π+), E at 180 MeV/c; measured missing-mass spectrum. 9He deduced mass excess, neutron binding energy, levels.
1987SEZS: 9Be(π-, π+), E = 194 MeV; measured missing mass spectra. 9He deduced levels, possible J, π.
1988BE34: 9Be(14C, 14O), E = 152.6, 158 MeV; measured ejectile spectra. 9He deduced levels, parameters.
1988BEYJ: 9Be(14C, 14O), E not given; measured reaction σ. 9He deduced levels, Γ.
1988BO20: 9Be(13C, 13O), E = 380 MeV; measured σ(E(13O)). 9He deduced levels, mass excess.
1990BEYY: 9Be(18O, 18Ne), E = 260.5 MeV; measured σ. 9He deduced mass excess.
1994PEZZ: 9He; measured not abstracted; deduced levels, Γ, J. Data on (14C, 14O) reviewed.
1995OSZX: 9Be(14C, 14O), E ≈ 25 MeV/nucleon; measured recoil spectra.
1995VO05: 9Be(14C, 14O), E = 337 MeV; measured residual nucleus spectra.
1999BO26: 9Be(14C, 14O), E ≈ 335 MeV; measured residual nuclei spectra. 9He deduced levels, possible J, π.
2001CH31: 9Be(11Be, X)9He, E = 28 MeV/nucleon; measured (fragment)(neutron)-coin, relative velocities. 9He deduced ground-state L.
2001PE27: 9Be(14C, 14O), E = 337 MeV; measured particle spectra. 2H, C(11Li, 2n8He), E = 61 MeV/nucleon; measured invariant mass spectrum.
2004BA67: 9He; analyzed resonance widths.
2004RO42: 1H(8He, 8He), E* ≈ 15 - 20 MeV; measured σ(θ), excitation functions. 9He deduced IAS features.
2005RO37: 1H(8He, 8He), E not given; measured recoil proton spectrum; deduced excitation function. 9He deduced analog states features.
2006GOZY: 2H(8He, p), E = 25 MeV/nucleon; measured particle spectra. 9He deduced excited states energies, widths.
2007FOZY: 2H(8He, p), E = 15.3 MeV/nucleon; measured charged particle energies and yields.
2007GO24: 2H(8He, p), E = 25 MeV/nucleon; measured particle energy and missing mass spectra.
2007GO41: 2H(8He, p), E = 25 MeV/nucleon; measured proton and 8He energies. 9He; deduced resonance parameters.
2010JO06: 1H(11Li, n2p), E = 280 MeV/nucleon; measured (fragment)(neutron)-coin, relative energy spectra; deduced resonance state parameters.
2012MAZZ: 9Be(18O, 18Ne), E = 1432 MeV; measured E(particle), I(particle).
2013AL14: 2H(8He, p), E = 15 MeV/nucleon; measured proton spectra, kinetic energies and angles of recoiling protons, σ(θ). 9He; deduced levels from experimental missing mass spectra, J, π, widths, l-transfers, configurations, spectroscopic factors, parity inversion in 9He. DWBA and CCBA analyses of σ(θ) data.
2016UB01: 1H(8He, 8He), Ecm < 4.5 MeV; measured reaction products. 9He; deduced energy levels, J, π.
2020GU20: 14C(π-, pα), (π-, d3He), E = 30 MeV; analyzed missing mass spectra. 9He; deduced ground state parameters, J, π, resonance parameters.
2020VO08: 9Be(11Be, 8He + n), E = 44 MeV/nucleon; 9Be(12B, 8He + n), E = 45 MeV/nucleon, measured E(n), I(n), charged-particles, (particle)n-coin; deduced decay energy spectra of 9He and neutron-unbound states. 9He; deduced levels, resonances, widths, J, π, l-values of neutrons from the resonances in 9He.

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Last modified: 29 June 2021