No abstract

PHYSICAL REVIEW LETTERS 22 SEPTEMBER 1975 X Y 0 Akimov et al., "Proton-Deuteron Elastic Scattering at Small Momentum Transfer from 50 to 400 GeV/c" (to be published). 2 Y. Akimov et al 0i preceding Letter [Phys. Rev. Lett. 3J5, 763 (1975)]. 3 This is justified by the near factorization of the form factor in elastic scattering (Ref. 1) and by the factorization of the diffractive vertex in the low-mass region (Ref. 2). In a fit of our inelastic data where c was treated as a free parameter, we obtained c = 64 0 3± 11.4 (GeV/c)~4 in agreement with the (more accurate) value of 62.3 ± 1.1 given by the deuteron form factor.

No abstract

We have measured the cross section, the angular distribution, and the A polarization for the reaction ir~p-+ Aif°. A spark-chamber spectrometer was used to collect 8400 AK° events at fourteen beam momenta near ZK threshold. Our data do not show the prominent cross-section enhancement suggested by some previous experiments. However, detailed structure in the cross section and the angular distribution agrees well with a simple model which includes a cusp effect at Z;K threshold.

We present results of measurements on photoproduction of p mesons. Analysis of 10 6 measured p events in a four-dimensional data matrix da(A,m ,p 9 t ± )/d$ldm with dimensions 14x20x10x20 yields precise information on nuclear density distributions for p production. We obtain for the Woods-Saxon radii R{A) = (1.12 ± 0.02)A l/3 and, using the vector dominance model, a N = 26.7 ±2.0 mb and y 2 /47r = 0.57 ±0.10. tion per nucleon |/ 0 | 2 . This yields a pJv and y p 2 / 477 = (a/6477)(a p7V 2 /|/ 0 | 2 ) in a self-consistent manner. Since the original work of Lanzerotti et al., 1 I. several experiments have been done 2,3 to investi-71

No abstract

We have measured the longitudinal shift of a microwave beam at total internal reflection. Good agreement with the prediction of classical electromagnetic theory is provided. The magnitude of the effect at microwave frequencies is conveniently large and the experimental setup used is sufficiently straightforward to allow this experiment to be repeated in an undergraduate laboratory program.

No abstract