Abstract
The atomic-beam method has been applied to the measurement of isotope shifts in the line of five radioactive isotopes including the isomeric pair -. The shifts in these lines, relative to the energy in the line of are as follows: , +5.9(1.5) mK; , +2.8(1.5) mK; , +1.8(1.0) mK; , -2.2(1.2) mK; and , -6.0(1.5) mK. Here a positive sign means that the frequency of the line for the indicated isotope is greater than that for . Evidence is presented which indicates that the observed shifts arise almost completely from nuclear effects. These shifts must therefore be compared with a calculated shift arising from the normal volume effect of 10 mK/neutron.
- Received 31 July 1968
DOI:https://doi.org/10.1103/PhysRev.177.122
©1969 American Physical Society