Symmetric, plate-impact experiments were performed to validate photon Doppler velocimetry (PDV) with established shock wave diagnostics. Impact velocity measurements using shorting pins demonstrated that the velocity accuracy of PDV can be 0.1% or better. Shock velocities and refractive indices were also measured with PDV (at 1550 nm) and velocity interferometer system for any reflector (VISAR) (at 532 nm) to obtain window corrections for single crystal LiF (100), c-cut sapphire, and z-cut quartz. Time-dependent, free-surface velocity histories for shocked LiF(100) provide a direct comparison between PDV and VISAR diagnostics and illustrate the benefits and shortcomings of the new diagnostic. Further implications of these results are presented.
Improved agreement between calculation and ^ elastic-scattering data across the (3,3) resonance is obtained by assuming the 7r~nucleon collision energy, u> f to be ^ 30 MeV less than the incident pion energy. This effect has been observed for nuclei ranging from 9 Be to 208 Pb.Yrast states with spins up to about 22h~ have been identified in 176 Os, 178 Os, 180 Os, and 182 Os. In each case anomalies are observed in the yrast sequence. The yrare extensions of the ground-state and Stockholm bands in 178 Os and 180 Os are also observed and the magnitude of the yrast-yrare interaction matrix elements extracted and discussed.
7r-4 He inelastic cross sections have been measured at r ff =180 MeV. In the region of the J w = 1" states (£* -23 to 30 MeV) the 7r + /7r~ cross-section ratio R n was found to be 1.05 ±0.08 at ^lab^O 0 . Such a small deviation from 1.0 implies that isospin mixing between the T = 0 and T-\ states in 4 He is quite weak, in striking contrast to the strong isospin mixing deduced from the large ratio of photonucleon cross sections, R y =
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