April 1, 2007 Journal article Open Access

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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{
  "DOI": "10.1103/physrevlett.98.142501", 
  "author": [
    {
      "family": "Beck, B. R."
    }, 
    {
      "family": "Becker, J. A."
    }, 
    {
      "family": "Beiersdorfer, P."
    }, 
    {
      "family": "Brown, G. V."
    }, 
    {
      "family": "Moody, K. J."
    }, 
    {
      "family": "Wilhelmy, J. B."
    }, 
    {
      "family": "Porter, F. S."
    }, 
    {
      "family": "Kilbourne, C. A."
    }, 
    {
      "family": "Kelley, R. L."
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2007, 
        4, 
        1
      ]
    ]
  }, 
  "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-->0 keV).", 
  "title": "Energy Splitting of the Ground-State Doublet in the Nucleus Th 229", 
  "type": "article-journal", 
  "id": "1233955"
}