THE $lambda$-HYPERON MASS AND ENERGY SPECTRUM FROM THE NUCLEAR CAPTURE OF NEGATIVE K MESONS (thesis)
Technical Report
·
OSTI ID:4137910
In two emulsion stacks exposed to K/sup -/-meson beams, a total of 128 LAMBDA -like decays in which the secondaries came to rest were found by area scanning in the region of stopping K mesons. All these events were analyzed and 116 proved to be hyperons. The range-measurement techniques employed were essentially those used by Barkas and coworkers in determining the range-energy relation for emulsion. The emulsion densities and shrinkage factors were precisely determined in order to obtain reliable results. The LAMBDA -hyperon mass as obtained from the analysis of the events in the first stack is 1115.30 plus or minus 0.11 Mev (29 events); in the second, it is 1115.46 plus or minus 0.09 Mev (87 events). The errors include the statistical and systematic errors associated with each stack. The two mass values are not inconsistent. The weighted mean mass is 1115.40 plus or minus 0.14 Mev, where the total error arises from the statistical errors of the two determinations and from an 0.12-Mev error associated with systematic effects, i.e., the error in the range-energy relation and the uncertainties in the rest masses of the secondaries. The correspending Q value for the decay via the charged mode is 37.56 plus or minus 0.13 Mev. The LAMBDA -hyperon production spectrum from the capture of K/sup -/ mesons is presented. A description of a microscope equipped with automatic coordinate-readout devices is appended. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-14-026200
- OSTI ID:
- 4137910
- Report Number(s):
- UCRL-9297
- Country of Publication:
- United States
- Language:
- English
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