Abstract
The Mössbauer effect in and contained in Xe has been used to measure the ratio of electric quadrupole moments of the lowest states in the two isotopes. This is the ground state in and the first excited state in . The value is obtained. The sign of the moment in is obtained by use of a source containing oriented crystals of K which produces Xe in its beta decay. The quadrupole moment is found to be negative. The known quadrupole moment of the ground state of , -0.12b, then gives b. The large ratio of the moments is interpreted as due to the abrupt onset of a region of permanent deformation by analogy with a similar situation in the europium isotopes. Discussions of such a region appear in the literature. The linewidth observed in yields a value for the first-excited-state lifetime, nsec, in good agreement with delayed-coincidence measurements. The measured value for the ratio of the moments removes a difficulty in understanding the structure of xenon fluorides generated by an earlier assumption that the ratio was unity.
- Received 17 April 1964
DOI:https://doi.org/10.1103/PhysRev.135.B1102
©1964 American Physical Society