Observation of a dip-bump structure in differential cross section for pp --> nn in the 700-760 MeV/c momentum range
Abstract
Based on a sample of about 3500 events, we have measured the total and differential cross sections of pp --> nn in the 700-760 MeV/c incident momentum region. It is found that σCE = 10.7 +/- 0.2 mb at the average momentum of 730 MeV/c. The differential angular distribution is characterised by a sharp peak and a dip in the forward direction followed by a secondary maximum. The position of the dip corresponds to t ~ mπ2. These results are compared with the predictions of the model of Bryan-Phillips. On the other hand, this dip-bump structure can be well understood on a simple picture involving a π exchange and a constant background (for t <~ 3 mπ2).
- Publication:
-
Physics Letters B
- Pub Date:
- May 1976
- DOI:
- 10.1016/0370-2693(76)90064-2
- Bibcode:
- 1976PhLB...62..117B