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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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  <identifier identifierType="URL"></identifier>
      <creatorName>Beck, B. R.</creatorName>
      <givenName>B. R.</givenName>
      <creatorName>Becker, J. A.</creatorName>
      <givenName>J. A.</givenName>
      <creatorName>Beiersdorfer, P.</creatorName>
      <creatorName>Brown, G. V.</creatorName>
      <givenName>G. V.</givenName>
      <creatorName>Moody, K. J.</creatorName>
      <givenName>K. J.</givenName>
      <creatorName>Wilhelmy, J. B.</creatorName>
      <givenName>J. B.</givenName>
      <creatorName>Porter, F. S.</creatorName>
      <givenName>F. S.</givenName>
      <creatorName>Kilbourne, C. A.</creatorName>
      <givenName>C. A.</givenName>
      <creatorName>Kelley, R. L.</creatorName>
      <givenName>R. L.</givenName>
    <title>Energy Splitting of the Ground-State Doublet in the Nucleus Th 229</title>
    <date dateType="Issued">2007-04-01</date>
  <resourceType resourceTypeGeneral="JournalArticle"/>
    <alternateIdentifier alternateIdentifierType="url"></alternateIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1103/physrevlett.98.142501</relatedIdentifier>
    <rights rightsURI="">Creative Commons Zero v1.0 Universal</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
    <description descriptionType="Abstract">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--&amp;gt;0 keV).</description>
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