Measured Ground-State Γ_cm(T_1/2) 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), E_cm = 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), E_cm < 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