14C

Thermal Neutron Capture Evaluated Data



Measurements
1975SM02: 13C(n, γ); measured atomic mass.
1981MUZU: 13C(n, γ), E = thermal; measured σ(capture), ratio. 14C level deduced spectroscopic factor.
1982MU14: 13C(n, γ), E = thermal; measured σ(Eγ), Iγ; deduced capture mechanism.
1987LY01, 1987LYZY: 13C(n, γ), E = thermal; calculated capture σ.
1990RA03: 13C(n, γ), E = resonance; measured Eγ, Iγ. 14C levels deduced partial, total Γγ. Valence capture mechanism.
1992JUZZ: 13C(n, γ); 14C deduced neutron separation energies. Capture γ-spectroscopy. Comparison with Wapstra predictions.
1999ZHZM, 2000ZHZP: 13C(n, γ), E = thermal; compiled, evaluated prompt γ-ray data.
2002RE13: 13C(n, γ), E = thermal; compiled, analyzed prompt Eγ, Iγ.
2003MOZU: 13C(n, γ), E = thermal; compiled, analyzed capture σ, neutron binding energies.
2003ZHZY: 13C(n, γ), E = thermal; analyzed Eγ, Iγ; deduced prompt γ-ray emission probabilities.
2008FIZZ: 13C(n, γ), E = thermal; measured cross sections; deduced cross section balance.
2016FI06: 13C(n, γ), E = thermal; measured Eγ, Iγ, σγ; 14C deduced levels, J, π, absolute transition probabilities, γ-ray cross sections.
Measured total cross section for 13C(n, γ)14C

Recommended value: 1.22 ± 0.06 mb (EGAF)
Measured values: 1.22 ± 0.06 mb (EGAF)
1.37 ± 0.04 mb (2003MUZZ)
1.37 ± 0.04 mb (1982MU14)
0.9 ± 0.2 mb (1973MU14, SH74M)
0.9 ± 0.2 mb (1964ST25)
1.0 ± 0.2 mb (1963MO1C)
0.9 ± 0.3 mb (1955HU1B)

Recommended Values

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

 

Eγ (keV) Ei (keV) Ef (keV) σγ Iγ a
6092.46 ± 0.17 6093.88 0 (1.98 ± 0.17) × 10-4 16.2 ± 1.6  
  495.71 ± 0.17 6589.60 6093.88 (9.72 ± 0.87) × 10-5 7.97 ± 0.81
6587.93 ± 0.22 0    
  808.82 ± 0.15 6902.73 6093.88 (4.39 ± 0.43) × 10-5 3.60 ± 0.40
1273.82 ± 0.13 Capture State 6902.73 (5.98 ± 0.95) × 10 -5 4.90 ± 0.82
1586.91 ± 0.14 6589.60 (1.03 ± 0.10) × 10 -4 8.43 ± 0.88
2082.56 ± 0.13 6093.88 (2.99 ± 0.52) × 10 -5 2.45 ± 0.44
8174.04 ± 0.18 0 (1.02 ± 0.09) × 10 -3 83.5 ± 8.8  
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 (%)
6092.46 ± 0.17 6093.88 0 100       
  495.71 ± 0.17 6589.60 6093.88  
6587.93 ± 0.22 0  
  808.82 ± 0.15 6902.73 6093.88 100       
1273.82 ± 0.13 Capture State 6902.73 4.9
1586.91 ± 0.14 6589.60 8.5
2082.56 ± 0.13 6093.88 2.5
8174.04 ± 0.18 0 84.1  

Previous Measurements

 

Eγ (keV) Ei (keV) Ef (keV) Iγ (%)
(1982MU14) (1967TH05)
6093 6094 0   13 ± 1
1274 8176 6900 4.9 ± 1     
1587 6590 8.5 ± 0.5  
2083 6090 2.5 ± 0.5  
8174 0 84.0 ± 2.3   87 ± 5

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Last modified: 12 June 2019