Lambda polarization at 90 degrees in (positive kaon, lambda-hyperon) photoproduction

Citation

Groom, Donald Eugene (1965) Lambda polarization at 90 degrees in (positive kaon, lambda-hyperon) photoproduction. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/0N2W-SD31. https://resolver.caltech.edu/CaltechETD:etd-05162003-104732

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.

The polarization of [lambda] hyperons in the reaction [lambda] + p [...]K[superscript +] + [lambda] has been measured, using the Caltech synchrotron. The measurements were made at 90[degrees] in the c. m. system, at laboratory photon energies of 1100 MeV, 1200 MeV, and 1300 MeV. Protons from the asymmetric decay of the [lambda] were detected by counters placed, symmetrically above and below the plane defined by the photon beam and the mean kaon momentum. Kaons were detected in a 16 to 18 counter range telescope. If preliminary logic was satisfied, all pulse heights from counters in the telescope were digitized and recorded on paper tape, along with relevant coincidence information. A detailed fit to the Bragg curve was made in a digital computer to establish the kaon identification. The results were P[lambda] = +0.34 [...] 0.09 at 1100 MeV, + 0.30 [...] 0.07 at 1200 MeV, and + 0.08 [...] 0.07 at 1300 MeV, where P[lambda] is measured in the [...] direction. These data, together with those of other groups, add support to the suggestion that the effects of the third [pi]N resonance are evident in K[lambda] photoproduction.

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