Measurement of the ${}^{229}$Th isomer energy with a magnetic micro-calorimeter

Tomas Sikorsky, Jeschua Geist, Daniel Hengstler +13

We present a measurement of the low-energy (0--60keV) $\gamma$ ray spectrum produced in the $\alpha$-decay of ${}^{233}$U using a dedicated cryogenic magnetic micro-calorimeter. The energy…