All of this data was taken from the Special Feature section of neutron scattering lengths and cross sections of the elements and their isotopes in Neutron News, Vol. 3, No. 3, 1992, pp. 29-37.

The contents of the columns are as follows:

Column	Unit	Quantity
1	---	Isotope
2	---	Natural abundance (For radioisotopes the half-life is given instead)
3	fm	bound coherent scattering length
4	fm	bound incoherent scattering length
5	barn	bound coherent scattering cross section
6	barn	bound incoherent scattering cross section
7	barn	total bound scattering cross section
8	barn	absorption cross section for 2200 m/s neutrons

Note: 1fm=1E-15 m, 1barn=1E-24 cm^2, scattering lengths and cross sections in parenthesis are uncertainties.

Neutron scattering lengths and cross sections
Isotope	conc	Coh b	Inc b	Coh xs	Inc xs	Scatt xs	Abs xs
C	---	6.6460	---	5.551	0.001	5.551	0.0035
12C	98.9	6.6511	0	5.559	0	5.559	0.00353
13C	1.1	6.19	-0.52	4.81	0.034	4.84	0.00137

Back up to the periodic table.

These data were entered by hand from the above cited paper. As such some errors may exist. Report errors or make inquiries to Alan Munter, <alan.munter@nist.gov>