11B

Thermal Neutron Capture Evaluated Data



Measurements
1967RA24: 10B(n, γ), E = thermal; measured Eγ; deduced Q.
1969WE07: 10B(n, γ), E = thermal; measured Eγ, Doppler shift attenuation. 11B levels deduced T1/2.
1970MEZS: 10B(n, γ), E = thermal; measured σ.
1986KO19: 10B(n, γ), E = thermal; measured Eγ, Iγ; deduced σ. 11B deduced neutron binding energy, transition energies.
2001AC04: 10B(n, γ), E = thermal; measured Eγ, Iγ; deduced k0 factors.
2002RE13: 10B(n, γ), E = thermal; compiled, analyzed prompt Eγ, Iγ.
2003CHZX: 10B(n, γ); measured Eγ, Iγ; deduced prompt k0-factors, partial σ.
2003MOZU: 10B(n, γ), E = thermal; compiled, analyzed k0 factors.
2004MA76: 10B(n, γ), E = thermal; analyzed data; deduced k0 factors, γ-emission probabilities.
2008FIZZ: 10B(n, γ), E = thermal; measured cross sections; deduced cross section balance.
2011SL01: 10B(n, γ), E = thermal; compiled, evaluated σ, σ(Eγ), γ decay schemes, levels, J, π using ENDF, DICEBOX.
2016FI06: 10B(n, γ), E = thermal; measured Eγ, Iγ, σγ; 11B deduced levels, J, π, absolute transition probabilities, γ-ray cross sections.
2015RUZZ: 10B(n, γ), E = slow; measured Eγ, γ, gγ-coin at DANCE.
Measured total cross section for 10B(n, γ)11B

Recommended value: 0.29 ± 0.04 b
Measured values: 0.390 ± 0.011 b (2008FIZZ); 0.303 ± 0.020 b (EGAF)
0.305 ± 0.016 b (2006MUZX)
0.5 ± 0.1 b (2003MUZZ)
0.29 ± 0.04 b (1986KO19)
0.5 ± 0.2 b (1973MU14, 1957BA18)

Recommended Values

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

 

Eγ (keV) Ei (keV) Ef (keV) σγ Iγ a
4444.03 ± 0.11 4445.00 0 (1.96 ± 0.17) x 10 -1 64.6 ± 7.0  
2296.63 ± 0.13 6741.88 4445.00 (2.71 ± 0.61) x 10 -2 8.95 ± 2.10
6739.67 ± 0.17 0 (5.67 ± 0.54) x 10 -2 18.7 ± 2.2  
(4474.5 ± 0.3) 8920.48 4445.00 (2.26 ± 0.36) x 10 -3 0.746 ± 0.129
8916.60 ± 0.19 0 (3.87 ± 0.43) x 10 -2 12.8 ± 1.6  
2533.35 ± 0.18 Capture State 8920.48 (4.17 ± 0.62) x 10 -2 13.8 ± 2.2  
4711.18 ± 0.10 6741.88 (7.78 ± 0.66) x 10 -2 25.7 ± 2.8  
7006.75 ± 0.09 4445.00 (1.64 ± 0.13) x 10 -1 54.2 ± 5.7  
11447.75 ± 0.14   0 (1.41 ± 0.16) x 10 -2 4.64 ± 0.61
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 (%)
4444.03 ± 0.11 4445.00 0 100
2296.63 ± 0.13 6741.88 4445.00      32.3
6739.67 ± 0.17 0      67.7
(4474.5 ± 0.3) 8920.48 4445.00        (5.5)
8916.60 ± 0.19 0      94.5
2533.35 ± 0.18 Capture State 8920.48      14.0
4711.18 ± 0.10 6741.88      26.1
7006.75 ± 0.09 4445.00      55.1
11447.75 ± 0.14   0        4.7

Previous Measurements

 

Eγ (keV) a Assignment Iγ (%)
(1986KO19) (1967TH05) weighted mean of
(1967TH05, 1986KO19)
weighted mean of (1967TH05, 1986KO19)
and references cited in (2008FIZZ)
(1957BA18,
1958BA52)
2533.40 ± 0.14        cap. → 8920 12 ± 4 15 ± 2 14.4 ± 1.8 14.1 ± 1.4  
4711.18 ± 0.07        cap. → 6740 28 ± 2 25 ± 1 25.6 ± 0.9 25.6 ± 0.9 30
7006.75 ± 0.07        cap. → 4445 56 ± 2 54 ± 3 55.4 ± 1.7 55.3 ± 1.6 18
11447.72 ± 0.13    cap. → 0   4.6 ± 0.3   6 ± 1   4.7 ± 0.3   4.70 ± 0.26      0.8
8916.67 ± 0.16 8920 → 0 13 ± 1 15 ± 2 13.4 ± 0.9 13.3 ± 0.8   6
4474.5 ± 0.3       8920 → 4445         0.74 ± 0.13  
2296.63 ± 0.13       6740 → 4445   7 ± 4 10 ± 3   8.9 ± 2.4   8.9 ± 1.6  
6739.53 ± 0.16 6740 → 0 19 ± 2 19 ± 1 19.0 ± 0.9 19.0 ± 0.8 10
5019 ± 5 5020 → 0   < 2   < 2  
4444.03 ± 0.08 4445 → 0 67 ± 4 65 ± 3 65.7 ± 2.4 65.6 ± 2.3 80
2120 ± 5 2120 → 0   < 3   < 3  
a) From the weighted average of (1986KO19) and references cited in (2008FIZZ).

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Last modified: 12 June 2019