8Li

Thermal Neutron Capture Evaluated Data



Measurements
1967RA24: 7Li(n, γ), E = thermal; measured Eγ; deduced Q.
1973JUZT, 1973JUZU: 7Li(n, γ), E = thermal; measured σ(Eγ). 7Li deduced γ-branching.
1991LY01: 7Li(n, γ), E = thermal; measured Eγ, Iγ, capture σ.
1996BL10: 7Li(n, γ), E = 1.5-1340 eV; measured Eγ, Iγ, γ yield, absolute σ(E).
1997HEZW, 1998HE35: 7Li(n, γ), E ≈ 5 meV, 54 keV; measured σ.
1999ZHZM, 2000ZHZP: 7Li(n, γ), E = thermal; compiled, evaluated prompt γ-ray data.
2002RE13: 7Li(n, γ), E = thermal; compiled, analyzed prompt Eγ, Iγ.
2003MOZU: 7Li(n, γ), E = thermal; compiled, analyzed k0 factors, capture σ, neutron binding energies.
2008FIZZ: 7Li(n, γ), E = thermal; measured cross sections; deduced cross section balance.
2011SL01: 7Li(n, γ), E = thermal; compiled, evaluated σ, σ(Eγ), γ decay schemes, levels, J, π using ENDF, DICEBOX.
2016FI06: 7Li(n, γ), E = thermal; measured Eγ, Iγ, σγ; 8Li deduced levels, J, π, absolute transition probabilities, γ-ray cross sections.
2018TI06: 7Li(n, γ), E = 0.01 - 2 MeV; calculated σ(E); deduced effects of potential nonlocality in direct radiative capture reactions.
Measured total cross section for 7Li(n, γ)8Li

Recommended value: 45.7 ± 0.9 mb (EGAF)
Measured values: 45.7 ± 0.9 mb (EGAF)
45.4 ± 3.0 mb (2003MUZZ)
40 ± 2 (stat.) ± 4 (syst.) mb (1996BL10)
45.4 ± 3.0 mb (1991LY01)
37 ± 4 mb (1964ST25)
  40 ± 12 mb (1961JA19)
40 ± 8 mb (1959IM04)
  42 ± 10 mb (1956KO1C)
33 ± 5 mb (1947HU06)

Recommended Values

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

 

Eγ (keV) Ei (keV) Ef (keV) σγ Iγ a
  980.53 ± 0.07 980.60 0 (4.490 ± 0.141) x 10-3 9.830 ± 0.364
1051.90 ± 0.07 Capture State 980.60 (4.480 ± 0.130) x 10-3 9.800 ± 0.344
2032.30 ± 0.04 0 (4.120 ± 0.087) x 10-2 90.20 ± 2.60  
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 (%)
  980.53 ± 0.07 980.60 0 100
1051.90 ± 0.07 Capture State 980.60        9.8
2032.30 ± 0.04 0      90.2

Previous Measurements

 

Eγ (keV) Ei (keV) Ef (keV) Iγ (%)
(1991LY01) (1961JA19) Preliminary Values
  980   981 0 100 100
1050 2032 981 10.6 ± 1.0   20
2030 0 89.4 ± 1.0   80

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Last modified: 12 June 2019