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Energy Splitting of the Ground-State Doublet in the Nucleus Th 229

Beck, B. R.; Becker, J. A.; Beiersdorfer, P.; Brown, G. V.; Moody, K. J.; Wilhelmy, J. B.; Porter, F. S.; Kilbourne, C. A.; Kelley, R. L.

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Beck, B. R.</dc:creator>
  <dc:creator>Becker, J. A.</dc:creator>
  <dc:creator>Beiersdorfer, P.</dc:creator>
  <dc:creator>Brown, G. V.</dc:creator>
  <dc:creator>Moody, K. J.</dc:creator>
  <dc:creator>Wilhelmy, J. B.</dc:creator>
  <dc:creator>Porter, F. S.</dc:creator>
  <dc:creator>Kilbourne, C. A.</dc:creator>
  <dc:creator>Kelley, R. L.</dc:creator>
  <dc:description>The energy splitting of the 229Th 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 233U (105 muCi) 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--&gt;0 keV).</dc:description>
  <dc:title>Energy Splitting of the Ground-State Doublet in the Nucleus Th 229</dc:title>
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