Measurements of the spectral content of L-and X-band radar reflections from seleral resolution cells containing wind-blown trees are examined under a wide variety of typical wind conditions. Most of the discernible energy (i.e., within 60 dB of the peak zero-Doppler level) occurs in the spectra at Doppler winly days. The rates of decay of energy with increasing Doppler velocity in the tails of the spectral distributions at spectral off-sets well removed from zero often appear to be approximately exponential. Estimates of rates of exponential decay in the spectral tails as a function of windspeed are provided in three regimes of windspeed.
A study has been made of the photoproduction of /i pairs from carbon using a 5-BeV bremsstrahlung beam at the Cambridge Electron Accelerator. We report here the initial experimental results which when compared with theory 1 ' 2 provide a test of the validity of the quantum electrodynamic (QED) description of the muon propagator at squared four-momentum transfers q m 2 up to about 8 F" 2 . The /i-pair detector was a 154-counter hodoscope arranged in two similar arrays placed symmetrically on either side of the y beam, as shown in Fig. 1. The counters nearest the target defined the polar and azimuthal angles of each member of the muon pair. The range of polar angles 9 covered was from about 4. 5° to about 11.5° and was divided into nine equal intervals. The range of azimuthal angles, cp x and
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