YN scattering data: SE64
The experiment:
75 elastic Λ p events have been recorded in an exposure
of the Saclay 81 cm hydrogen bubble chamber at CERN to a beam of
stopping K- mesons.
These results were preliminary;
final results are published in SE68.
The data:
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Λ p → Λ p
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total elastic cross section (SGT)
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momentum range effective mean number of SGT [mb]
[MeV/c] momentum [MeV/c] events
120 - 170 144 10 130 +/- 50
170 - 200 186 11 105 +/- 34
200 - 230 216 18 195 +/- 55
230 - 260 248 13 66 +/- 22
260 - 400 291 6 52 +/- 23
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Notes:
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Errors are combined statistical (from counting events) as well as a
15% overall uncertainty.
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It is noticed that the angular distribution of events around 260 MeV/c
is strongly peaked in the
forward direction. This was predicted:
B. Ram and B.W. Downs, Phys.Rev. 137(1964)B420
