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An attempt is made to verify the presence of effects due to vacuum polarization in available experimental data on proton-proton scattering. In spite of the smallness of these effects and relatively large errors in the data, it appears that the data substantiates the predicted effects of vacuum...
An improved optical model is used to study the scattering of mesons by light nuclei, C 12 in particular. It is found that the differential cross section can be fit reasonably well if a nucleus is used which has a diffuse edge; the Gaussian shape seems to work well for C 12 .
It is shown that in field theory the structure of the scattering matrix for a certain variety of processes, such as those between a meson and a nucleon, a photon and a charged particle, etc., can be analyzed making use of relativistic invariance and microscopic causality. General formulas have...
Lifetime measurements in the 10 - 9 sec range have been made for E 2 or M 1 + E 2 transitions in the following nuclei: Sm 152 , Gd 154 , Hf 180 , W 182 , Os 188 , Ir 191 , Au 197 , and Po 210 . Upper limits for lifetimes have been established for E 2 or M 1 + E 2 transitions in Ir 191 , Pb 204 ,...
New measurements of the total cross section of Be 9 (resolution 4 kev) give maxima of 7.75±0.20 barns ( Γ = 25 kev) and 5.25±0.20 barns ( Γ = 8 kev) for the 0.62 Mev and 0.81 Mev resonances, consistent with J = 3 and J = 2 for the respective compound state spin values. Elastic scattering...
Deuteron-helium elastic scattering cross sections have been measured from E d = 0.28 to 4.62 Mev. A resonance at E d = 1.070 Mev and Γ ∼ 35 kev was observed at 9 angles from 90° to 173.6° c.m. This resonance corresponds to the previously observed 2.187-Mev state of Li 6 . No scattering...
A search for gamma emitters in the millisecond range of half-life was conducted, using the 32-Mev Berkeley proton linear accelerator. Foil targets of eighteen common elements were bombarded, and the activity made in them was followed between beam pulses with a gated scintillation counter. The...
The thick-target method for the measurement of the ratio of total to scattering cross section for low-energy neutrons as a function of energy has been extended to include semi-thick targets. A family of calibration curves has been developed by means of which the measured scattered count may be...
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