After a short introduction in ยง 1, ยง 2 deals with some changes made in the experimental arrangement and a thorough discussion of various corrections. ยง 3 gives the measuremeatsand ยง 4 their discussion. They include :
A. self-absorption curves for Cu (5 rain period), Ag (2.3 min), Ag (22 sec), A1. B. boron absorption measurements from which resonance energies could be calculated. C. Doppler-effect for Ag (22 sec) and Cu (5 min). In the latter case, where the resonance energy is rather high (110 eV), a very definite effect has really been found. D. Activabilities both for resonance and thermal neutrons for the same elements. E. gives for the same elements and moreover for Zn (dealt with in a former paper), the different methods of calculation of the effective level width I~el!; they are : 1. from the 13 r e i t-W i g n e r one level formula; 2. from the activability; 3. from scattering experiments. This is a new method, a ~uller account of which will be given in a following paper, part III. In this paper only the results are used. 4. from Doppler-width. It is shown that methods 1 and 2 in many cases give too high values, as more than one resonance level plays its part. ยง 5 From a thorough discussion of all results it follows that the effective width re1 ! does not increase at higher resonance energy, while the neutron width does not seem to depend upon the resonance energy and the atomic weight. The average distance between resonance levels for neutron capture is about 15 eV for Ag (A = 100) and about 150 eVforCu(A = 65) in agreement with Bethe's theory. ยง I. Introduction. In a former report 2) here quoted as part I a short theoretical introduction has been given. Here we will only summarise some quantities which will be determined in the following.
It has been assumed, that the B r e i t-W i g n e r formula 3) for --281 --*) This value has been put equal to that of row I.