B. L. Roberts
Boston University
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Physical Review Letters | 1992
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
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
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
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
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
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
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
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
Yannis K. Semertzidis; F.J.M. Farley; D. M. Lazarus; W. M. Morse; B. L. Roberts
Physical Review Letters | 1992
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