Abstract
Sources of and have been produced and mass separated on line. Multiscaled spectra of γ rays, x rays, and conversion electrons, and γ-γ and γ-x-ray coincidences were measured. The M4 isomeric transition of the state of , with a half-life of 4.17 min, was observed for the first time, permitting the placement of the and levels above the ground state. Also, the placement of the state in Po together with previously reported α-decay Q values made possible the location of the isomeric state in . From an analysis of γ-γ-t coincidence data and energy sums, 26 transitions were placed in a decay scheme between 23 levels in . On the basis of systematics the population of a isomeric state in was deduced. The isomeric (M4) transition to the ground state was not observable in the present data; its rate is at least 390 times less than the Weisskopf single particle estimate.
- Received 20 August 1984
DOI:https://doi.org/10.1103/PhysRevC.31.582
©1985 American Physical Society