Journal article Open Access

# An excited state of Th 229 at 3.5 eV

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

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<identifier identifierType="URL">https://zenodo.org/record/1233767</identifier>
<creators>
<creator>
<creatorName>Helmer, R. G.</creatorName>
<givenName>R. G.</givenName>
<familyName>Helmer</familyName>
</creator>
<creator>
<creatorName>Reich, C. W.</creatorName>
<givenName>C. W.</givenName>
<familyName>Reich</familyName>
</creator>
</creators>
<titles>
<title>An excited state of Th 229 at 3.5 eV</title>
</titles>
<publisher>Zenodo</publisher>
<publicationYear>1994</publicationYear>
<dates>
<date dateType="Issued">1994-04-01</date>
</dates>
<resourceType resourceTypeGeneral="Text">Journal article</resourceType>
<alternateIdentifiers>
<alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/1233767</alternateIdentifier>
</alternateIdentifiers>
<relatedIdentifiers>
<relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1103/physrevc.49.1845</relatedIdentifier>
</relatedIdentifiers>
<rightsList>
<rights rightsURI="https://creativecommons.org/publicdomain/zero/1.0/legalcode">Creative Commons Zero v1.0 Universal</rights>
<rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
</rightsList>
<descriptions>
<description descriptionType="Abstract">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.</description>
</descriptions>
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