Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.142503
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Funding
- European Union's Horizon 2020 research and innovation program [664732 nuClock, 856415 ThoriumNuclearClock, 882708 CrystalClock, 824109 European Microkelvin Platform]
- European Metrology Program For Innovation And Research (EMPIR) program
- European Union's Horizon 2020 research and innovation program
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We present a measurement of the low-energy (0-60 keV) gamma-ray spectrum produced in the a decay of U-233 using a dedicated cryogenic magnetic microcalorimeter. The energy resolution of similar to 10 eV, together with exceptional gain linearity, allows us to determine the energy of the low-lying isomeric state in Th-229 using four complementary evaluation schemes. The most precise scheme determines the Th-229 isomer energy to be 8.10(17) eV, corresponding to 153.1(32) nm, superseding in precision previous values based on. spectroscopy, and agreeing with a recent measurement based on internal conversion electrons. We also measure branching ratios of the relevant excited states to be b(29) = 9.3(6)% and b(42) < 0.7%.
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