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The isomeric first excited state of Th-229 exhibits the lowest nuclear excitation energy in the whole landscape of known nuclei. Due to its extremely low energy of 7.6(5) eV and its long lifetime of ca. 10(4) s, it exhibits an extremely sharp relative linewidth of Delta E/E approximate to 10(-20), thus rendering Th-229m an ideal candidate for a nuclear optical clock with very high accuracy. An experimental approach is introduced, based on a spatially decoupled population and de-excitation of the isomeric state, aiming at a first direct identification of the 163(11) nm UV fluorescence and targeting to improve on the accuracy of the transition wavelength, thus enabling an all-optical control via laser excitation. DOI:10.5506/APhysPolB.44.391

acta physica polonica. b

Towards an All-optical Access to the Lowest Nuclear Excitation in &lt;sup&gt;&lt;span class="cmr-7"&gt;229&lt;/span&gt;&lt;span class="cmmi-7"&gt;m&lt;/span&gt;&lt;/sup&gt;Th