ISOMERIC TRANSITIONS IN Pb$sup 20$$sup 5$
From measurements with electromagnetically isotopeseparated samples in a double-focusing beta spectrometer, a 26.22 plus or minus 0.01-kev transition in Pb/sup 205/ was identified from its internal L/sub I/, L/sub II/, L/sub III/ M/ sub I/, M/sub II/, M/sub III/, M/ sub IV/, N/sub I/, N/sub III/, and O/sub I/ conversion lines. The multipolarity was proved to be M2. There is strong evidence that this transition takes place from a 4.0 msec i/sub 13/2/ state of 1013.8 kev to the 987.6-kev state in Pb/sup 205/, thus causing the latter state to appear metaatable, as was earlier reported. This suggestion is also supported by the identification of a 310.5-kev E3 transition which probably takes place between the isomeric state and the 703.3-kev state. Furthermore, there is reason to believe that the expected M4 transition to the ground state is seen as part of a radiation of 1014.0 kev observed in the decay of Bi/sup 205/. The separation between the i/sub 13/2/ and f/sub 5/2/ levels is found to fit well into the systematics of the cdd lead isotopes. The electromagnetically separated sources were used also for a conclusive establishnnent of a 262.8-kev Ml transition in Pb/sup 205/ (cf. the 262.8-kev Ml transition in Pb/sup 206/). The possibility that this transition is associated with the first excited state is discussed. Some further conversion lines were also studied in the double- focusing spectrometer. In addition, the relative intensities of the KLL Auger lines in lead were measured and found to be in fairly good agreement with theoretical relativistic calculations. (auth)
- Research Organization:
- Nobel Inst. of Physics, Stockholm
- NSA Number:
- NSA-14-022369
- OSTI ID:
- 4157500
- Journal Information:
- Arkiv Fysik, Journal Name: Arkiv Fysik Vol. Vol: 17
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
Tb$sup 160$ AND Ho$sup 160$ DECAY AND Dy$sup 160$ LEVEL SCHEMES
THE MULTIPOLARITIES OF THE 208 AND 532 kev $gamma$-TRANSITIONS IN Er$sup 16$$sup 7$