Results from a detailed study using the Crystal Ball detector at SPEAR of the inclusive photon spectra from 1.8. lo6 $J' and 2.2. lo6 J/lc, decays are presented. Radiative transitions from the 9' to the x2,1,0 states are observed with photon energies of (126.0 f 0.2 f 4) MeV, (169.6 f 0.3 f 4) MeV and (258.4 f 0.4 f 4)21) MeV, respectively (90% C.L.). I m… (More)
Recent advances in parameter estimation and seismic processing have allowed incorporation of anisotropic models into a wide range of seismic methods. In particular, vertical and tilted transverse isotropy are currently treated as an integral part of velocity fields employed in prestack depth migration algorithms, especially those based on the wave equation.… (More)
1. Change DESY 85-019 to DESY 85-018 on title page. 2. Table I, footnote a on page 10: line 4-Change 1 + f cos2 8 to 1-f cos2 8; and line 5-Change 2Po to 3Po and by the Deutsche Forschungsgemeinschaft (Hamburg).
We have measured the inclusive cross section for n production in e+e-interactions near charm threshold using the Crystal Ball detector. No pronounced structure in the energy dependence is observed. By comparing cross sections above and below charm threshold we obtain the limits (90% C.L.): R(e+e-+F??X)*BR(F+nx) < 0.15-0.32 (for EC m from 4.0 to 4.5… (More)
The American Association of Physicists in Medicine (AAPM) is a nonprofit professional society whose primary purposes are to advance the science, education and professional practice of medical physics. The AAPM has more than 8,000 members and is the principal organization of medical physicists in the United States.The AAPM will periodically define new… (More)
The total cross section for e+e-annihilation into hadrons has been measured * by the Crystal Ball collaboration at the SLAC storage ring SPEAR, for center-of-mass energies 4 from 5.0 to 7.4 GeV. The data show no evidence for new thresholds or resonant structure in this energy range. The average value of R, the radiatively corrected total hadronic cross… (More)
We investigate the four-photon final state produced in yy collisions. In the TOT' channel we observe f(1270) production with predominantly helicity 2 and measure a partial width I' +.6 YY 2.gva4 + 0.6 keV (independent of assumptions on the helicity). We observe A2(1310) production in the nor\ channel and find a partial width r = 0.77 4 0.18 2 0.27 keV YY… (More)