The construction and optical properties of a MgF(2) double Rochon prism are described. The prism is useful as a polarizer or analyzer in the vacuum uv wavelengths longer than 1300 A. Measurements of MgF(2) transmission and of polarizer angular beam deviation from 1150 AS to 2900 A are presented.
Differential cross sections have been measured for the reactions C 12 (Li 6 ,a)N 14 and C 12 (Li 7 ,a=)N 15 with the residual nuclei in their ground or first few excited states. The total cross section for the 2.31-Mev T= 1 state of N 14 is 0.1 mb at 4.0 Mev, compared to a cross section of 2.9 mb for the ground state; this violation of the isotopic spin selection rule is probably due to mixing of different isotopic spin states in the compound nucleus F 18 . The differential cross sections for the other levels have general features suggestive of a direct interaction.
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