Journal article Open Access

An excited state of Th 229 at 3.5 eV

Helmer, R. G.; Reich, C. W.

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        <foaf:name>Helmer, R. G.</foaf:name>
        <foaf:givenName>R. G.</foaf:givenName>
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        <foaf:name>Reich, C. W.</foaf:name>
        <foaf:givenName>C. W.</foaf:givenName>
    <dct:title>An excited state of Th 229 at 3.5 eV</dct:title>
    <dct:issued rdf:datatype="">1994</dct:issued>
    <dct:issued rdf:datatype="">1994-04-01</dct:issued>
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    <dct:description>It has been known for many years that the first excited state of Th229 lies close to the ground state. Originally this energy was given as &amp;lt;0.1 keV; later, the authors reported a value of -1±4 eV. In an attempt to improve the value for this level energy, we have remeasured the energies of a number of γ rays from U223 whose positions in the Th229 level scheme can be used to establish it. Compared with our earlier study, we have considered more γ rays in Th229, used more well-measured energy calibration and reference lines, used more detectors, used detectors with better low-energy resolution, more closely matched the counting rates in the γ-ray peaks whose relative energy is measured, and specifically considered certain systematic errors. More than 111 γ-ray spectra have been measured. From this large set of measurements we have deduced a value of 3.5±1.0 eV for the energy of this level.</dct:description>
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