Levels inBi203,Bi205, and

Philip K. Hopke

¹

,

R.A. Naumann

²

,

E.H. Spejewski

³

Abstract

The decay of the odd-mass isotopes of polonium to levels in Bi 203 , Bi 205 , and Bi 207 have been studied. Isotopically separated sources have been produced in the Princeton-Pennsylvania accelerator and massdispersed by means of the Princeton electromagnetic isotope separator. 7-ray and conversion-electron spectra have been observed. With the aid of 7-7 coincidences, level schemes have been constructed for these three bismuth isotopes.

Spin of207mPo(2.79s); conversion measurement in207gPo decay

“…Because of this situation the present measurement on 2~ was started but no indication of an isomeric decay having a half-life in the range 2 < T1/2 < 60 s was traced. In 2~ decay large discrepancies have been reported [11,12] in earlier 7-ray data and a series of new 7-rays have also been suggested in a more recent measurement [13]. Because of these inconsistencies the present measurement was started.…”

“…Because of large inconsistencies in the earlier data [11][12][13] a remeasurement of v-ray and conversion electron intensities seemed to be indicated.…”