Studies of Z = 81 transitional nuclei II: 193Pb and 195Pb decay

Levels in 193195Tl were studied by the radioactive decay of mass-separated 193195Pb. The decay of the 15.8-min high spin isomer (presumably 13/2+) in 195Pb populates 24 states in Tl while decay of the 195Pb ground state to 6 low-spin levels is observed. The decay of 193Pb is studied in detail for the first time. The high spin isomer is found to have a half life of 5.57 +- 0.12 min and to decay to 15 states in 193Tl. In addition, 5 low spin levels are observed, indicating a half-life of 4.0 +- 0.7 min for the ground-state of 193Pb. In both nuclei, the s/sub 1/2/, d/sub 3/2/, and h/sub 11/2/ hole states are observed and the structure of levels built upon them is suggestive of weak coupling to Pb cores, as is also the case for 197Tl (previous paper). The structure of levels built upon the h/sub 9/2/ particle state in these two nuclei are also quite similar to the strongly coupled bands seen in 197Tl. Population of the i/sub 13/2/ particle state in 193Tl is observed; this is the only isotope of the three studied where the i/sub 13/2 excitation can be definitely observed and assigned. 13 references