Search

Production cross section and decay study of 243Es and 249Md

QR Code
Finna rating

Production cross section and decay study of 243Es and 249Md

In the study of the odd-Z, even-N nuclei 243Es and 249Md, performed at the University of Jyväskylä, the fusion-evaporation reactions 197Au(48Ca,2n)243Es and 203Tl(48Ca,2n)249Md have been used for the first time. Fusion-evaporation residues were selected and detected using a gas-filled separator coupled with its focal-plane spectrometer. For 243Es, the recoil decay correlation analysis yielded a half-life of 24±3s and a maximum production cross section of 37±10nb. In the same way, a half-life of 26±1s, an α-branching ratio of 75±5%, and a maximum production cross section of 300±80nb were determined for 249Md. The decay properties of 245Es, the daughter of 249Md, were also measured: an α-branching ratio of 54±7% and a half-life of 65±6s. Experimental cross sections were compared to the results of calculations performed using the kewpie2 statistical fusion-evaporation code.

Saved in: