4He

Thermal Neutron Capture Evaluated Data



Measurements
1964IM03: 3He(n, γ), E = thermal; deduced σ limits.
1973BOWJ: 3He(n, γ); measured σ(Eγ).
1975SM02: 3He(n, γ); measured atomic mass.
1979ALZS: 3He(n, γ), E = thermal; measured σ. 4He level deduced admixture of symmetry; calculated σ(E), M1 transitions, Gaussian wave functions for 3,4He.
1979SU05: 3He(n, γ), E = thermal; measured σ for double-photon emission.
1980AL05: 3He(n, γ), E = thermal; measured σ. 4He deduced mixed symmetry level.
1989ABZZ: 3He(n, γ), E = thermal; calculated radiative capture σ; deduced single photon 3He(n, γ) σ.
1989WO10, 1989WOZY: 3He(n, γ), E = thermal; measured capture σ.
1991WE06: 3He(n, γ), E = thermal; measured capture σ. Shell model calculations for 3He(n, γ), meson exchange currents.
2003MOZU: 3He(n, γ); compiled, analyzed capture σ, neutron binding energies.
Measured total cross section for 3He(n, γ)4He

Recommended value: 0.031 ± 0.009 mb (2003MUZZ)
Measured value: 0.031 ± 0.009 mb (2003MUZZ)
0.055 ± 0.003 mb (1991WE06)
0.054 ± 0.006 mb (1989WO10)
0.027 ± 0.009 mb (1980AL05)
0.060 ± 0.012 mb (1979SU05)
0.060 ± 0.030 mb (1973BO34)

Recommended Values

taken from the Evaluated Gamma-ray Activation File (EGAF) evaluation

 

Eγ (keV) Ei (keV) Ef (keV) σγ Iγ a
20520.46 20577.62 0 (3.070 ± 0.879) x 10-5 100
a) Iγ: Intensity per 100 neutron captures.

Branching Ratios deduced from

Thermal Neutron Capture γ-decay (EGAF)

 

Eγ (keV) Ei (keV) Ef (keV) Branching Ratio (%)
20520.46 20577.62 0 100

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Last modified: 12 June 2019