Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

Abstract

Absolute γ-ray emission probabilities in the β − decay of 67 Cu were measured by means of γ-ray and β − -decay singles and β − − γ coincidences. The new results, together with the known decay scheme of 67 Cu, were used to determine absolute β − -decay branching intensities. The present data differ significantly from previously published values. In addition, the half-life of the I π =1/2 − isomer in 67 Zn was measured as T 1/2 =9.37(4) µs, in a good agreement with earlier measurements. From the analysis of the Fermi-Kurie plots, Q β − (g.s.)=560.3(10) keV was deduced, which differs from the previously measured value of 577(8) keV, but it is in a good agreement with Q β − (g.s.)=561.3(15) keV recommended in the latest Atomic Mass Evaluation.

Summary Report of the Technical Meeting on Nuclear Data for Medical Applications

“…-67 Cu 100% βdecay → four well-defined βemissions and six gamma rays [41] measured and re-evaluated decay scheme to be incorporated into recommended international/national databases; -114 In m , 1γ, (1β -, 2γ); 117 Sn m , 3γ; 193 Pt m , 3γ; and 195 Au m , 5γ IT decay -measurement/reassessment of internal-conversion electron probabilities for radiotherapy; -131 Cs and 135 La 100% EC decay -potential sources of X-rays and Auger electrons for microdosimetry. Auger-electron and X-ray decay data calculated in both spectral and tabulated forms (BrIccEmis code, NS_RadList v1.0);…”