Journal article Open Access

An excited state of Th 229 at 3.5 eV

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


MARC21 XML Export

<?xml version='1.0' encoding='UTF-8'?>
<record xmlns="http://www.loc.gov/MARC21/slim">
  <leader>00000nam##2200000uu#4500</leader>
  <datafield tag="540" ind1=" " ind2=" ">
    <subfield code="u">https://creativecommons.org/publicdomain/zero/1.0/legalcode</subfield>
    <subfield code="a">Creative Commons Zero v1.0 Universal</subfield>
  </datafield>
  <datafield tag="260" ind1=" " ind2=" ">
    <subfield code="c">1994-04-01</subfield>
  </datafield>
  <controlfield tag="005">20200120173414.0</controlfield>
  <controlfield tag="001">1233767</controlfield>
  <datafield tag="909" ind1="C" ind2="O">
    <subfield code="p">openaire</subfield>
    <subfield code="o">oai:zenodo.org:1233767</subfield>
  </datafield>
  <datafield tag="520" ind1=" " ind2=" ">
    <subfield code="a">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.</subfield>
  </datafield>
  <datafield tag="700" ind1=" " ind2=" ">
    <subfield code="a">Reich, C. W.</subfield>
  </datafield>
  <datafield tag="856" ind1="4" ind2=" ">
    <subfield code="s">639899</subfield>
    <subfield code="z">md5:115a9c08350f2486e6de0cda0e4c4448</subfield>
    <subfield code="u">https://zenodo.org/record/1233767/files/article.pdf</subfield>
  </datafield>
  <datafield tag="542" ind1=" " ind2=" ">
    <subfield code="l">open</subfield>
  </datafield>
  <datafield tag="980" ind1=" " ind2=" ">
    <subfield code="a">publication</subfield>
    <subfield code="b">article</subfield>
  </datafield>
  <datafield tag="100" ind1=" " ind2=" ">
    <subfield code="a">Helmer, R. G.</subfield>
  </datafield>
  <datafield tag="024" ind1=" " ind2=" ">
    <subfield code="a">10.1103/physrevc.49.1845</subfield>
    <subfield code="2">doi</subfield>
  </datafield>
  <datafield tag="245" ind1=" " ind2=" ">
    <subfield code="a">An excited state of Th 229 at 3.5 eV</subfield>
  </datafield>
  <datafield tag="650" ind1="1" ind2="7">
    <subfield code="a">cc-by</subfield>
    <subfield code="2">opendefinition.org</subfield>
  </datafield>
</record>
125
87
views
downloads
Views 125
Downloads 87
Data volume 55.7 MB
Unique views 122
Unique downloads 87

Share

Cite as