Abstract
Neutron-deficient isotopes of cadmium were produced in thep(600 MeV)+natSn spallation reaction. The ISOLDE facility provided mass-separated beams of these isotopes. The production yield was 103 to 104 atoms/s for100Cd and roughly two orders of magnitude less for98Cd. The properties of the100Cd→100Ag decay were studied in detail by X-ray,γ-ray and conversion electron spectroscopy. Forty nineγ-transitions were assigned to this decay, and all but five of them were placed in the decay scheme. The half-life was determined to be 49.1±0.5 s. TheQ EC value of 3890±70 keV was deduced from a comparison of experimental and theoreticalβ +/(EC+β + probability ratios. Seven 0+→1+ Gamow-Teller transitions with log ft values between 3.5 and 4.9 were identified. The total (summed) strength is about five times smaller than predicted by the shell model for the transformation of ag 9/2 proton into ag 7/2 neutron. The quenching of the Gamow-Teller strength and other questions of nuclear structure are discussed for the100Cd decay. The properties of98Cd are inferred by extrapolation of104,102,100Cd data, and some preliminary experimental results on98Cd decay are presented.
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The conversion electron spectroscopy presented in this work is part of the Ph.D. thesis of R. Barden