Abstract
The total neutron cross section of chlorine has been measured with the Materials Testing Reactor crystal spectrometer (0.03-70 ev) and fast chopper (16-15 000 ev). The chlorine cross section drops from 45 barns at 0.03 ev to a low of 1.3 barns at 5 kev. A sharp resonance is observed in at 405±6 ev. A two-sample-area analysis of this resonance gives the limiting values; ev and barns. For these limits, ev. Another level was observed at 8.7±0.5 kev. A good fit to the cross-section data is given by a single-level Breit-Wigner formula for a negative-energy resonance in with spin 2 and the following parameters; ev, ev, ev, cm, and barns. From these parameters, one would obtain barns and barns.
The carbon cross section was also measured and appears flat with an average value of barns.
- Received 15 June 1956
DOI:https://doi.org/10.1103/PhysRev.104.1054
©1956 American Physical Society