A new search for conversion of muonium to antimuonium

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To search for conversion of muonium (M {identical to} {mu}{sup +}e{sup {minus}}) to antimuonium ({anti M} {identical to} {mu}{sup {minus}}e{sup +}) with very low background, a new signature was implemented that required the time-coincident detection of the decay e{sup {minus}}({le} 53 MeV) with the atomic e{sup +}({approximately} 13 eV) from decay of an {anti M} atom. A 20 MeV/c {mu}{sup +} beam was stopped in a 9 mg/cm{sup 2} SiO{sub 2} powder target. Muonium, formed in the powder, diffused into a vacuum region at thermal velocities and was observed for a coincidence of {anti M} decay products. Any decay e{sup ... continued below

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Pages: (231 p)

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Matthias, B.E. October 1, 1991.

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Description

To search for conversion of muonium (M {identical to} {mu}{sup +}e{sup {minus}}) to antimuonium ({anti M} {identical to} {mu}{sup {minus}}e{sup +}) with very low background, a new signature was implemented that required the time-coincident detection of the decay e{sup {minus}}({le} 53 MeV) with the atomic e{sup +}({approximately} 13 eV) from decay of an {anti M} atom. A 20 MeV/c {mu}{sup +} beam was stopped in a 9 mg/cm{sup 2} SiO{sub 2} powder target. Muonium, formed in the powder, diffused into a vacuum region at thermal velocities and was observed for a coincidence of {anti M} decay products. Any decay e{sup {minus}} was charge and momentum analyzed in a dipole magnet and tracked by an array of MWPCs; any atomic e{sup +} was electrostatically collected, accelerated to 5.7 keV, and magnetically transported to a microchannel plate detector. To calibrate the signature, M was observed for the first time by coincidence of its decay e{sup +} and its atomic e{sup {minus}}. A maximum likelihood analysis of the position distribution of decay origins finds no {anti M} events and less than 2 at 90% confidence. This places an upper limit on the conversion probability per atom of S{anti M} < 6.5 {times} 10{sup {minus}7} (90% C.L.), which corresponds to an upper limit of G{sub M}{anti M} < 0.16 G{sub F} (90% C.L.) on the effective coupling constant for a (V - A) conversion coupling. In a class of left-right symmetric models, the value of G{sub M}{anti M} may be in this range. 116 refs., 45 figs., 10 tabs.

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Pages: (231 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Other Information: Thesis (Ph.D). Thesis submitted to Yale Univ., New Haven, CT

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  • Other: DE92002129
  • Report No.: LA-12202-T
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5131986 | External Link
  • Office of Scientific & Technical Information Report Number: 5131986
  • Archival Resource Key: ark:/67531/metadc1059361

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  • October 1, 1991

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:04 p.m.

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Matthias, B.E. A new search for conversion of muonium to antimuonium, report, October 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1059361/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.