Measurement of the Λ→<i>n</i>+γ branching ratio

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

doi:10.1103/PhysRevLett.69.414

Measurement of the Λ→n+γ branching ratio

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

Phys. Rev. Lett. 69, 414 – Published 20 July 1992

Abstract

The branching ratio for the Λ weak radiative decay has been measured to be B(Λ→n+γ)/(Λ→anything) =[1.78±0.24(stat) $\pm_{0.16}^{0.14}$ (syst)]× $10^{- 3}$ . A low-energy kaon beam was used to produce the Λ hyperons via the reaction $K^{-}$ +p→Λ+ $π^{0}$ at rest. Photons from the signal channel and $π^{0}$ 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.

Received 14 November 1991

DOI:https://doi.org/10.1103/PhysRevLett.69.414

Authors & Affiliations

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

University of Birmingham, Birmingham, B15 2TT, United Kingdom
Boston University, Boston, Massachusetts 02215
University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
Brookhaven National Laboratory, Upton, New York 11973
Case Western Reserve University, Cleveland, Ohio 44106
Central Research Institute for Physics of the Hungarian Academy of Sciences (KFKI), Budapest, H-1525 Hungary
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
University of New Mexico, Albuquerque, New Mexico 87131
Princeton University, Princeton, New Jersey 08544
TRIUMF, Vancouver, British Columbia, Canada V6T 2A3