Journal
PHYSICAL REVIEW LETTERS
Volume 98, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.142501
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The energy splitting of the Th-229 ground-state doublet is measured to be 7.6 +/- 0.5 eV, significantly greater than earlier measurements. Gamma rays produced following the alpha decay of U-233 (105 mu Ci) were counted in the NASA/electron beam ion trap x-ray microcalorimeter spectrometer with an experimental energy resolution of 26 eV (FWHM). A difference technique was applied to the gamma-ray decay of the 71.82 keV level that populates both members of the doublet. A positive correction amounting to 0.6 eV was made for the unobserved interband decay of the 29.19 keV state (29.19 -> 0 keV).
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