Need for Upward Revision ofλgλsand its Consequences

Degenerate Bose System. III. Dilute Gas of Hard Spheres

“…This is particularly * Part of this work was done while the author was at the Tata 2518 (1963), has given a review of the imperfect Bose gas problem, as well as an independent derivation of the Lee, Huang, Yang ground-state energy expression for the hard-sphere Bose gas. 6 true of a new and difficult theory, such as the one which we are using.…”

“…correcting Tyren's concave grating measurements for the Lamb shift, 6 DuMond and Kirkpatrick's 7 difficulties in repeating Tyren's measurements, theoretical questions, 8 and the experimental problems involved in attempting to improve the plane grating measurements by the use of crystals for separating the ai, 0:2 lines, emphasize the importance of establishing the x-ray wavelength scale by other methods. Actually only one set of plane grating measurements 1 is free of serious errors, and this has a probable error of 30 ppm.…”