PHYSICS DIVISION SUMMARY REPORT FOR JULY-AUGUST 1960

In a study of nuclear resonance absorption of gamma rays. calculations were carried out to determine the effect on Zeeman lines of applying a resonant r- f field. Thirty-two gamma rays from Er/sup 161/, produced by (n,2n) and ( gamma .n) reactions. were measured and fitted into a decay scheme. Spin and parity assignments of some levels are indicated. Results from molecular beam studies are presented for Ho/sup 166/ and Ge/sup 71/. In the program for Ar/sup 40/-K/sup 40/ dating of meteorites, a method was developed for pumping down atmospheric cutoffs, Toepler pumps, and other apparatus without carefully matching pumping rates. (For preceding period see ANL6l69. For subsequent period see ANL-62l4.) (W.D.M.