PROTON RADIOACTIVITY FROM TM-146 - THE COMPLETION OF A SEQUENCE OF 4 ODD-ODD PROTON EMITTERS

Proton emission has been observed from the new isotope 146Tm. Two tran sitions have been identified at energies of 1119 +/- 5 keV and 1189 +/ - 5 keV corresponding to Q-values of 1127 +/- 5 keV and 1197 +/- 5 keV respectively. The measured half-lives of 2 35 +/- 27 ms and 72 +/- 2 3 ms are well reproduced by simple WKB calculations assuming proton em ission from h11/2 orbitals. The proton transitions are assigned to a 1 0+ isomeric state and a low lying 5- or 6- level.