Q_EC value and Gamow-Teller strength of the¹⁰²CdEC/gb⁺ decay

Within the framework of a systematic study of 0⁺→1⁺Β-transitions in the¹⁰⁰Sn region, the decay of the neutrondeficient isotope¹⁰²Cd was investigated. This isotope was produced in¹⁶O+⁹²Mo and⁵⁸Ni+⁵⁰Cr heavy-ion reactions and in proton-induced spallation of^natSn, and mass-separated samples were prepared by means of the GSI and the ISOLDE on-line mass separators, respectively. Observations of X-rays, γ-rays, and conversion-electrons studies have led to an improved¹⁰²Cd→¹⁰²Ag decay scheme which includes six 0⁺→1⁺ Gamow-Teller transitions. The half-life of¹⁰²Cd was redetermined with higher accuracy to be 345±8 s. Using a Si(Li)-BGO-Ge spectrometer, the Β⁺ endpoint energy of the main decay component was measured, yielding a Q_EC value of 2587±8 keV. This very small uncertainty of Q_EC, combined with the improved knowledge of half-life and decay scheme, allows an accurate determination of the observed Gamow-Teller decay strength B_Σ(GT)=1.513±0.055 for¹⁰²Cd. This result is discussed in comparison with predictions from model calculations.