11B

¹¹B

Thermal Neutron Capture Evaluated Data

Measurements

1967RA24: ¹⁰B(n, γ), E = thermal; measured E_γ; deduced Q.
1969WE07: ¹⁰B(n, γ), E = thermal; measured E_γ, Doppler shift attenuation. ¹¹B levels deduced T_1/2.
1970MEZS: ¹⁰B(n, γ), E = thermal; measured σ.
1986KO19: ¹⁰B(n, γ), E = thermal; measured E_γ, I_γ; deduced σ. ¹¹B deduced neutron binding energy, transition energies.
2001AC04: ¹⁰B(n, γ), E = thermal; measured E_γ, I_γ; deduced k₀ factors.
2002RE13: ¹⁰B(n, γ), E = thermal; compiled, analyzed prompt E_γ, I_γ.
2003CHZX: ¹⁰B(n, γ); measured E_γ, I_γ; 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(E_γ), γ decay schemes, levels, J, π using ENDF, DICEBOX.
2016FI06: ¹⁰B(n, γ), E = thermal; measured E_γ, I_γ, σ_γ; ¹¹B deduced levels, J, π, absolute transition probabilities, γ-ray cross sections.
2015RUZZ: ¹⁰B(n, γ), E = slow; measured E_γ, 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**
E_γ (keV)	E_i (keV)	E_f (keV)	σ_γ	I_γ ^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	6741.88	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	8920.48	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) I_γ: Intensity per 100 neutron captures.

Branching Ratios deduced from
Thermal Neutron Capture γ-decay (EGAF)
E_γ (keV)	E_i (keV)	E_f (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	6741.88	0	67.7
(4474.5 ± 0.3)	8920.48	4445.00	(5.5)
8916.60 ± 0.19	8920.48	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**
E_γ (keV) ^a	Assignment	I_γ (%)
E_γ (keV) ^a	Assignment	(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: 23 June 2021