Carbon-13 Neutron Total Cross Section

The total neutron cross section of carbon-13 was measured for neutron energies from 110 kev to 9 Mev and from 16 Mev to 23 Mev. Four narrow resonances were observed as well as broad resonance structure above 3 Mev. The most probable spin assignments based on the resonance heights and widths are as follows: $E_R=153\mathrm{}\pm 5$ kev, $\Gamma =13\mathrm{}$ kev, $J=1^{+}$; $E_R=1751\mathrm{}\pm 8$ kev, $\Gamma =20\mathrm{}$ kev, $J=1\mathrm{}$; $E_R=2432\mathrm{}\pm 10$ kev, $\Gamma =17\mathrm{}$ kev, $J=2\mathrm{}$; $E_R=2454\mathrm{}\pm 10$ kev, $\Gamma =10\mathrm{}$ kev, $J>~1$.