MEETING XVII -- BEVATRON RESEARCH CONFERENCE -- BEVATRON OPERATION

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Bevatron operation has been stopped temporarily due to a generator fault. While repairs are being instituted the tank will be down to air for repairs and target installation. Operation on one generator is scheduled for May 3. It has been previously proposed that one could investigate the {pi}{sub 0} lifetime by measuring the converted electron yield from {pi}{sub 0} decay photons as a function of the thickness of a thin target in which both the {pi}{sub 0} production and photon conversion occur. If the lifetime were effectively zero the electron yield should depend quadratically upon thickness; whereas if the lifetime ... continued below

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Lofgren, E.J. April 20, 1954.

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Bevatron operation has been stopped temporarily due to a generator fault. While repairs are being instituted the tank will be down to air for repairs and target installation. Operation on one generator is scheduled for May 3. It has been previously proposed that one could investigate the {pi}{sub 0} lifetime by measuring the converted electron yield from {pi}{sub 0} decay photons as a function of the thickness of a thin target in which both the {pi}{sub 0} production and photon conversion occur. If the lifetime were effectively zero the electron yield should depend quadratically upon thickness; whereas if the lifetime is sufficiently great, this quadratic rise will be delayed as the thickness is increased, due to the distance travelled by the {pi}{sub 0} before decay. In fact, the beginning of the yield dependence is cubic rather than quadratic in character. It is estimated that a lifetime of 10{sup -15} seconds should provide a distinctly detectable effect. The investigation may be considered practical at the Bevatron providing: (a) the production cross section for {pi}{sub 0}'s at 6 Bev is about 100 times that at 340 Mev, (b) a Bevatron pulse of 10{sup 8} protons, with a recirculation of 1000 times thru the thin target can be achieved. Thin foils of Au or of U would be used as targets, with thicknesses of the order of 10{sup -4} cm. Some assumptions about the meson momentum spectrum are implicit in these plans. It has been assumed that tho pion kinetic energy spectrum in the nucleon-nucleon C.M. frame peaks at 0.3 Bev. This gives at 0{sup o} in the laboratory T{sub {pi}} = 1.5 Bev, or a time dilation of {gamma} = 12. Techniques have been evolved for utilization of 6 x 6-inch Ilford G-5 plates of 600{micro}-thickness. A typical operating schedule and some pertinent remarks with respect to processing are discussed. Some general remarks with respect to heavy meson experiments are included.

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  • Report No.: UCRL-2576
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/993537 | External Link
  • Office of Scientific & Technical Information Report Number: 993537
  • Archival Resource Key: ark:/67531/metadc1013706

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  • April 20, 1954

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 18, 2017, 10:34 a.m.

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Lofgren, E.J. MEETING XVII -- BEVATRON RESEARCH CONFERENCE -- BEVATRON OPERATION, report, April 20, 1954; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1013706/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.