Measured Ground-State Γ_cm(T_1/2) for ⁴n

Adopted value: 1.75(37) MeV (2022Du08)

1952SU10: ¹⁰³Rh, ²⁰⁹Bi(n, 4n), E ≈ 18 MeV; measured reaction products. ⁴n; deduced tetraneutron yield upper limit.

1965CI01: ⁴n; measured not abstracted; deduced nuclear properties; non existence.

1968BA48: ⁴n deduced mass.

1977BA47: ⁷Li(π^-, ³He), E = 0 MeV; measured σ for production of neutron nuclei ⁴n.

1984UN02: ⁴He(π^-, π⁺), E = 165 MeV; measured σ(θ) vs pion momentum; deduced bound tetraneutron production σ upper limit.

1985DO19: ⁶Li(π^-, np), E at rest; measured (particle)(particle)-coin; deduced reaction mechanism.

1986BE44: ⁷Li(¹¹B, ¹⁴O), E = 88 MeV; measured product spectra. ⁴n deduced unbound levels, T_1/2, Γ.

1987BO40: ⁷Li(¹¹B, ¹⁴O), E(cm) = 34.2 MeV; measured energy spectra, σ(θ). ⁴n deduced unbound states.

1988BE02: ⁷Li(⁹Be, ¹²N), E = 58 - 85 MeV; deduced ⁴n production σ upper limit.

1989GO17: ⁴He(π^-, π⁺), E = 80 MeV; deduced tetraneutron production σ upper limit.

2002MA21: C(¹⁴Be, nX), E = 35 MeV/nucleon; C(¹¹Li, nX), E = 30 MeV/nucleon; C(¹⁵B, X), E = 48 MeV/nucleon; measured E_n, (charged particle)n-, nn-coin, angular distributions; deduced possible neutron cluster formation.

2003OR05: A new approach to the production and detection of bound neutron clusters is described, and the observation of events with the characteristics expected for tetraneutrons (4n) liberated in the breakup of ¹⁴Be is also discussed.

2004BEZT: ²H(⁸He, ⁶Li), E = 15.8 MeV; measured missing mass spectrum. ⁴n deduced possible resonance.

2005AL15: ⁷Li(⁷Li, ¹⁰C), E = 82 MeV; measured particle spectra; deduced resonance formation σ upper limits.

2005MAZZ: C(¹⁴Be, X), E ≈ 30 - 50 MeV; analyzed data; deduced evidence for ⁴n. Possible bound-state and resonance contributions discussed.

2010NI10: ²H(⁸He, ³He)⁷H, E = 42 MeV/nucleon; measured ³He spectra; deduced missing-mass spectra of ⁷H. Search for ⁷H.

2010NIZT: ²H(⁸He, ³Het), E = 42 MeV/nucleon; measured E(particle), I(particle), (particle)(particle)-coin. ⁷H deduced σ(E), ⁷He missing mass spectra.

2016KI01: ⁴He(⁸He, ⁸Be); E = 186 MeV/nucleon; measured missing-mass spectrum; deduced the tetraneutron system energy of the state with uncertainties, Q-value.

2021MA23: ⁴He(π^-, π⁺), E = 165 MeV; ⁷Li(⁷Li, ¹⁰C), E < 65 MeV; analyzed available data. ⁴n; deduced miltineutron systems.

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Last modified: 23 February 2022