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Featured researches published by B. L. Roberts.


Physical Review Letters | 1992

["Measurement of the Λ→n+γ branching ratio"]

A. J. Noble; K.D. Larson; Bassalleck B; W. Fickinger; Hall; A. L. Hallin; Hasinoff; D. Horváth; J. Lowe; E. K. McIntyre; D.F. Measday; J. P. Miller; B. L. Roberts; D. K. Robinson; M. Sakitt; M. Salomon; Chris Waltham; Warner Tm; David A. Whitehouse; D.M. Wolfe

The branching ratio for the {Lambda} weak radiative decay has been measured to be {ital B}({Lambda}{r arrow}{ital n}+{gamma})/({Lambda}{r arrow}anything) =(1.78{plus minus}0.24(stat){plus minus}{sub 0.16}{sup 0.14}(syst)){times}10{sup {minus}3}. A low-energy kaon beam was used to produce the {Lambda} hyperons via the reaction {ital K}{sup {minus}}+{ital p}{r arrow}{Lambda}+{pi}{sup 0} at rest. Photons from the signal channel and {pi}{sup 0} decay were detected with a NaI(Tl) array. The final spectrum contains 287 events after background subtraction, an order of magnitude more events than from the only previous measurement.


Physical Review Letters | 1992

Measurement of the. Lambda. r arrow n +. gamma. branching ratio

A. J. Noble; K.D. Larson; Bassalleck B; W. Fickinger; J.R. Hall; A. L. Hallin; Hasinoff; D. Horváth; J. Lowe; E. K. McIntyre; D.F. Measday; J. P. Miller; B. L. Roberts; D. K. Robinson; M. Sakitt; M. Salomon; Chris Waltham; Warner Tm; David A. Whitehouse; D.M. Wolfe

The branching ratio for the {Lambda} weak radiative decay has been measured to be {ital B}({Lambda}{r arrow}{ital n}+{gamma})/({Lambda}{r arrow}anything) =(1.78{plus minus}0.24(stat){plus minus}{sub 0.16}{sup 0.14}(syst)){times}10{sup {minus}3}. A low-energy kaon beam was used to produce the {Lambda} hyperons via the reaction {ital K}{sup {minus}}+{ital p}{r arrow}{Lambda}+{pi}{sup 0} at rest. Photons from the signal channel and {pi}{sup 0} decay were detected with a NaI(Tl) array. The final spectrum contains 287 events after background subtraction, an order of magnitude more events than from the only previous measurement.


Physical Review C | 1991

pi- p ---> pi0 pi0 n near threshold and chiral symmetry breaking

J. Lowe; A. J. Noble; N.W. Tanner; T. M. Warner; Hasinoff; W. Fickinger; J. R. Hall; G. Koch; D.M. Wolfe; B. Bassalleck; J. P. Miller; M. Sakitt; D. Horvath; H. Burkhardt; Chris Waltham; D. K. Robinson; B. L. Roberts; M. E. Sevior; K.D. Larson

Total cross sections, angular, and mass distributions for the reaction {pi}{sup {minus}}{ital p}{r arrow}{pi}{sup 0}{pi}{sup 0}{ital n} have been measured for {ital p}{sub {pi}}{sup {minus}}(lab)=7--140 MeV/{ital c} above threshold. The threshold amplitude was used to determine a value for the chiral-symmetry-breaking parameter, {xi}, of {minus}0.98{plus minus}0.52. The {pi}{pi} scattering lengths {ital a}{sub {ital I}} for isospin {ital I}=0 and 2 are derived from this result, together with a current-algebra sum rule. The results are {ital a}{sub 0}=(0.207{plus minus}0.028){ital m}{sub {pi}}{sup {minus}1} and {ital a}{sub 2}=({minus}0.022{plus minus}0.011){ital m}{sub {pi}}{sup {minus}1}. These values are consistent with chiral symmetry broken by the Weinberg {pi}{pi} interaction and the effects of the {ital f}{sub 0}(975) scalar meson.


Nuclear Physics B - Proceedings Supplements | 1990

Weak radiative hyperon decays

B. L. Roberts; B. Bassalleck; E. C. Booth; W. Fickinger; K. P. Gall; J. R. Hall; A.L. Hallin; M. D. Hasinoff; N. P. Hessey; D. Horváth; K. D. Larson; J. Lowe; E. K. McIntyre; D.F. Measday; J. P. Miller; A. J. Noble; D.K. Robinson; M. Sakitt; M. Salomon; Chris Waltham; David A. Whitehouse; D.M. Wolfe

New measurements of the Σ+ and Λ weak radiative decays are discussed. The hyperons were produced at rest by the reaction K−p → Yπ where Y = Σ+ or Λ. The monoenergetic pion was used to tag the hyperon production, and the branching ratios were determined from the relative amplitudes of Σ+ → pγ to Σ+ → pπ0 and Λ → nγ to Λ → nπ0. The photons from weak radiative decays and from π0 decays were detected with modular NaI arrays.


3rd Conference on the Intersections Between Particle and Nuclear Physics | 1988

Status of E811: Hyperon weak radiative decay

A. J. Noble; M. D. Hasinoff; D.F. Measday; Chris Waltham; N. P. Hessey; J. Lowe; E. C. Booth; K. P. Gall; E. K. McIntyre; J. P. Miller; B. L. Roberts; David A. Whitehouse; M. Sakitt; J. Skelly; W. Fickinger; D. K. Robinson; D. Horváth; B. Bassalleck; J. R. Hall; K. D. Larson; D.M. Wolfe; A.L. Hallin; M. Salomon

We report the status of branching ratio measurements of Σ+→p+γ and Λ→n+γ. For the Σ+ decay a preliminary result is presented.


3rd Conference on the Intersections Between Particle and Nuclear Physics | 1988

Radiative kaon capture

E. K. McIntyre; E. C. Booth; W. Fickinger; K. P. Gall; M. D. Hasinoff; N. P. Hessey; D. Horváth; J. Lowe; D.F. Measday; J. P. Miller; A. J. Noble; B. L. Roberts; D. K. Robinson; M. Sakitt; M. Salomon; J. Skelly; David A. Whitehouse

Negative kaons were stopped in liquid hydrogen and liquid deuterium targets to study radiative capture rates. Branching ratios for the radiative kaon capture reactions K−p→Λγ and K−p→Σ0γ provide information about the quark structure of the Λ(1405). In the reaction K−d→Λnγ, the shape of the photon spectrum in the endpoint region provides information on the final state Λ‐n interaction. Superior photon resolution is needed to distinguish the signal photons from the background of π0 decay photons. Such resolution is provided by the B.U. NaI detector, which has a resolution of 1.3% (FWHM) near 300 MeV. A description of the experimental technique and data reduction is presented, along with preliminary branching ratio results.


Physical Review Letters | 1989

Radiative kaon capture at rest in hydrogen

David A. Whitehouse; E. C. Booth; W. Fickinger; K. P. Gall; M. D. Hasinoff; N. P. Hessey; D. Horváth; J. Lowe; E. K. McIntyre; D.F. Measday; J. P. Miller; A. J. Noble; B. L. Roberts; D. K. Robinson; M. Sakitt; M. Salomon


Archive | 2000

An Improved Limit on the Muon Neutrino Mass from Pion Decay in Flight

Robert M. Carey; Jonathan Miller; Ofer Rind; B. L. Roberts; Hilary K. Brown; Gerry M. Bunce; J.W. Glenn; Yung-Chi Lee; W. Meng; W. M. Morse


Archive | 1996

Experiment to measure the EDM of muon

Yannis K. Semertzidis; F.J.M. Farley; D. M. Lazarus; W. M. Morse; B. L. Roberts


Physical Review Letters | 1992

Measurement of the ??n+? branching ratio

A. J. Noble; K.D. Larson; B. Bassalleck; W. Fickinger; J. R. Hall; A. L. Hallin; M. D. Hasinoff; D. Horvath; J. Lowe; E. K. McIntyre; D.F. Measday; J. P. Miller; B. L. Roberts; D. Keith Robinson; M. Sakitt; M. Salomon; Chris Waltham; T. M. Warner; David A. Whitehouse; D. M. Wolfe

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M. Sakitt

Brookhaven National Laboratory

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W. Fickinger

Case Western Reserve University

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A. J. Noble

University of British Columbia

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J. Lowe

University of Birmingham

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D.F. Measday

University of British Columbia

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Chris Waltham

University of British Columbia

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