Abstract
The Christiansen-filter technique was used to measure the coherent scattering lengthsb for the bound atoms of the chlorine isotopes35C1 and37Cl. The results areb(Cl-35)=11.70 ±0.09 fm/atom andb(Cl-37)=3.08±0.06 fm/atom. Furthermore, the total cross section of natural chlorine for neutron energies 1.2 eV and 5.2 eV was determined by means of transmission measurements with rotating resonance detectors. From these data the spin state scattering lengthsa +(J=2) anda −(J=1) were obtained for the free nuclei of the isotopes. The derived values of the spin- and isotopically incoherent scattering cross section and the total scattering cross section at “zero energy” are well consistent with previously published resonance data. The present results combined with the resonance parameters make possible a complete description of the interaction of slow neutrons with the chlorine nuclei.
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