116422220
A Measurement of K0(L) --> pi+ pi- pi0 Decay Parameters
The decay ${K}_{L}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ has been studied in an experiment using the Argonne 12-ft hydrogen bubble chamber exposed to a ${K}_{L}^{0}$ beam of momentum 550 \ifmmode\pm\else\textpm\fi{} 35 MeV/c. After radiative corrections to the data, a fit using a matrix element of the form ${|M|}^{2}\ensuremath{\propto}1+\frac{g({s}_{3}\ensuremath{-}{s}_{0})}{{{m}_{{\ensuremath{\pi}}^{+}}}^{2}}+h{[\frac{({s}_{3} \ensuremath{-} {s}_{0})}{{{m}_{{\ensuremath{\pi}}^{+}}}^{2}}]}^{2} + k{[\frac{({s}_{1} \ensuremath{-} {s}_{2})}{{{m}_{{\ensuremath{\pi}}^{+}}}^{2}}]}^{2}$ gives $g = 0.681\ifmmode\pm\else\textpm\fi{}0.24$, $h = 0.095\ifmmode\pm\else\textpm\fi{}0.032$, and $k = 0.024\ifmmode\pm\else\textpm\fi{}0.010$. The branching ratio $\frac{\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0})}{\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}\mathrm{charged})}$ was measured to be 0.163 \ifmmode\pm\else\textpm\fi{} 0.003. These results, when compared to those obtained in other ${K}_{L}^{0}$ and ${K}^{\ifmmode\pm\else\textpm\fi{}}$ decay experiments, indicate a substantial $\ensuremath{\Delta}g\frac{1}{2}$ contribution to the ${K}_{L}^{0}$ decay amplitude.
120089999
Two-body final states in K-p interactions at 14.3 GeV/c
Event selection and weighting. In Fig. 1 a), the distribution of the square of the missing mass to the K0 in all zero-prong plus one K ~ events is displayed; a clear neutron signal is visible with a half-width of approximately 0.4 (GeV)L In the study of reaction (1) we use all events with missing mass less than the A(1236) mass. The cross-section is corrected for the few neutron events above this cut by double-counting the symmetrical region below the neutron mass. We also correct for the background reaction
118557074
Anti-p p annihilations into pi+ pi-, k+ k-, pi+ pi- pi0, and pi+ pi- neutrals near center-of-mass energy 2200 mev
122629720
K - p elastic scattering at 14.25 GeV/ c
Abstract The K − p differential and total elastic cross-sections have been measured at 14.25 GeV/ c . The results have been compared with various Regge models.
122509981
Search for direct electron production in p-p and p-Be collisions at 12 GeV/c
We have made a systematic search for direct e/sup +/ and e/sup -/ production in p-p and p-Be collisions at 12 GeV/c incident proton momentum. Data were collected at c.m. angles of 20/sup 0/, 35/sup 0/, 63/sup 0/, and 84/sup 0/. We find no evidence for the previously reported rise in the ratio e/..pi.. at low momentum transfer. The data are consistent with zero direct electron production from other than previously known sources.
107450647
Hodoscope subgroup summary microchannel plate photodetectors
A brief discussion is given of the possible uses of microchannel plate photomultipliers and multichannel or multianode photodetectors at ISABELLE.
15064784
Deep Inelastic e p Asymmetry Measurements and Comparison with the Bjorken Sum Rule and Models of Proton Spin Structure
We report new measurements of the asymmetry in the deep-inelastic scattering of longitudinally polarized electrons by longitudinally polarized protons in the kinematic range 2 < or = ..omega.. < or = 10, 1 < or = Q/sup 2/ < or = 4 (GeV/c)/sup 2/, and 2 < or = W < or = 4 GeV. We compare our results with the Bjorken sum rule and with several theoretical models of the internal spin structure of the proton.
8558006
SLC Injector Modeling
The injector for the Stanford Linear Collider is being studied using the fully electromagnetic particle-in-cell program MASK. The program takes account of cylindrically symmetrical RF fields from the external source, as well as fields produced by the beam and DC magnetic fields. It calculates the radial and longitudinal motion of electrons and plots their positions in various planes in phase space. Bunching parameters can be optimized and insights into the bunching process and emittance growth have been gained. The results of the simulations are compared to the experimental results.
50409441
Higher order correlations in computed particle distributions
The RMS emittances calculated for beam distributions using computer simulations are frequently dominated by higher-order aberrations. The possibility of defining higher-order correlations that can be removed from the distribution to result in a lower limit to the realizable emittance is explored. The purpose is to insert the correct combinations of linear lenses at the proper position so that the beam recombines in a way that cancels the effects of some higher-order forces. An example might be the nonlinear transverse space charge forces which cause a beam to spread. If the beam is then refocused so that the same nonlinear forces reverse the inward velocities, the resulting phase space distribution may reasonably approximate the original distribution. The motivation for this work comes from studies of a photocathode injector system for a linear accelerator intended to be used for a free-electron laser.<<ETX>>
139484727
ELECTRON GUN SPECIFICATIONS
115542306
Beam measurements on Argonne linac for collider injector design
The 20 MeV electron linac at Argonne produces 5 × 1010 electrons in a single bunch. This amount of charge per bunch is required for the proposed single pass collider at SLAC. For this reason the characteristics of the beam from this machine are of interest. The longitudinal charge distribution has been measured by a new technique. The technique is a variation on the deduction of bunch shape from a spectrum measurement. Under favorable conditions a resolution of about 1° of phase is possible, which is considerably better than can be achieved with streak cameras. The bunch length at 4.5 × 1010e− per bunch was measured to be 15° FWHM. The transverse emittance has also been measured using standard techniques. The emittance is 16 mm-mrad at 17. 2 MeV.