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


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.


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.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Walker, Robert Lee (advisor)
  • Sands, Matthew L. (co-advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:25 May 1965
Record Number:CaltechETD:etd-05162003-104732
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1832
Deposited By: Imported from ETD-db
Deposited On:16 May 2003
Last Modified:21 Dec 2019 04:24

Thesis Files

PDF (Groom_de_1965.pdf) - Final Version
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