No abstract

The internal beam of a 100-Mev proton synchrocyclotrol~ has been used in conjunction with a rapid target extraction unit to s t~~d y isomers of a few seconds' half-life. The results are tabulated below. Isomer sec 7-ray energy, I;ev h,IuItipolarity Ag103m 5.7+0.3 1 3 5 f 2 E3 InllGm22140+10, 300f10, 380+10 ' Ag103", has been assigned t o the odd-A group in the present paper. Another and smaller group of isomers belongs to the even mass, odd-odd classification (Hill 1950). The antiinoily nuclides exhibit only this type of long-lived isomerism. Once the Z = 50 shell closes, one extra proton cannot be easily excited into a higher level with large angular inonlentuln difference. However, the required spin difference can be produced by coupling to an odd neutron. Both indium (2 = 49) and silver (Z = 47) nuclides of even inass exhibit this type of isomerism, as well as the odd-A type. A previously reported isoiner of the odd-odd class, InLiGrn2 (Campbell and ICahn 1950; Kahn 1951 ;Campbell and Fettweis 1959; Alexander and Bredel 1960; Fettweis 1960), has been studied further, and a new isomer, probably also of this class, has been tentatively assigned to Sb118.

No abstract

No abstract

No abstract