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22 August 2017

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YN scattering data: SE68

Authors: B. Sechi-Zorn, B. Kehoe, J. Twitty, R.A. Burnstein
Reference: Phys. Rev. 175 (1968), 1735.
Group: Maryland

The experiment:

In the Saclay 81 cm Hydrogen Bubble Chamber which was exposed to a beam of K- mesons (about 230 MeV/c) from the Proton-Synchroton at CERN. 100000 pictures were scanned. 336 events were recorded of which 224 are used in the analyses.
Preliminary results were published in SE64.

The data:

Λ p → Λ p total elastic cross section (SGT)
momentum range      number of    SGT [mb]
    [MeV/c]          events

  120 - 150            14     209 +/- 58
  150 - 180            28     177 +/- 38
  180 - 210            49     153 +/- 27
  210 - 240            54     111 +/- 18
  240 - 270            59      87 +/- 13
  270 - 330            20      46 +/- 11
angular distribution
averaged over the range 180 - 248 MeV/c

   cos(theta)          number of
                        events

 -1.0  -  -0.75     20.0 +/- 4.0
 -0.75 -  -0.5      25.0 +/- 5.0
 -0.5  -  -0.25     32.0 +/- 6.0
 -0.25 -   0.0      23.4 +/- 5.0
  0.0  -   0.25     22.0 +/- 4.0
  0.25 -   0.5      25.5 +/- 4.6
angular distribution
averaged over the range 248 - 330 MeV/c

   cos(theta)          number of
                        events

 -1.0  -  -0.75      7.8 +/- 3.3
 -0.75 -  -0.5       9.3 +/- 3.3
 -0.5  -  -0.25      7.5 +/- 3.1
 -0.25 -   0.0      11.1 +/- 3.5
  0.0  -   0.25     23.4 +/- 4.0
  0.25 -   0.5      22.0 +/- 4.0
  0.5  -   0.75     25.0 +/- 6.6
F/B ratio
momentum range      number of      F/B
    [MeV/c]          events

 180 - 248                      0.9 +/- 0.2
 248 - 330                      1.8 +/- 0.4

Notes:


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