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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">izmertech-605</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Ядерные часы на основе тория-229. Ч. 2. Перспективы стандарта частоты</article-title><trans-title-group xml:lang="en"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Von Der Wense</surname><given-names>L. .</given-names></name></name-alternatives><email xlink:type="simple">L.Wense@physik.uni-muenchen.de</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Seiferle</surname><given-names>B. .</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Thirolf</surname><given-names>P. G.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="ru" id="aff-1"><institution>Университет Людвига-Максимилиана</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>07</day><month>02</month><year>2023</year></pub-date><volume>0</volume><issue>12</issue><fpage>17</fpage><lpage>22</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ФГУП "ВНИИФТРИ", 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">ФГУП "ВНИИФТРИ"</copyright-holder><copyright-holder xml:lang="en">ФГУП "ВНИИФТРИ"</copyright-holder><license xlink:href="https://www.izmt.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.izmt.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/605">https://www.izmt.ru/jour/article/view/605</self-uri><abstract><p>Представлен проект ядерных часов на основе изомера тория-229m (229mТh). Предложены и описаны потенциально перспективные методы исследований и проведения экспериментов по поиску радиационного распада и обнаружения229mТh, а также непрямые эксперименты по определению энергии изомера. Рассмотрены перспективы стандарта частоты на основе229mТh. Предложены другие элементы, на основе которых могут быть созданы ядерные часы.</p></abstract><trans-abstract xml:lang="en"><p>The article presents the project of Th-229m nuclear clock. The experiments searching for a radiative decay and the detection of the isomer of thorium-229m, as well as indirect experiments to determine the energy of the isomer are described. Potentially promising research methods and experiments for detection of the isomer of thorium-229m are offered. The prospects for frequency standard based on thorium-229m are presented. Other elements for nuclear clock are proposed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>ядерные часы</kwd><kwd>торий-229</kwd><kwd>nuclear clock</kwd><kwd>229Th</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Kroger L. A., Reich C. W. Features of the low energy level scheme of 229Th as observed in the α decay of 233U // Nucl. Phys. A. 1976. V. 259. P. 29-60.</mixed-citation><mixed-citation xml:lang="en">Kroger L. A., Reich C. W. Features of the low energy level scheme of 229Th as observed in the α decay of 233U // Nucl. Phys. A. 1976. V. 259. P. 29-60.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Helmer R., Reich C. W. An excited state of 229Th at 3.5 eV // Phys. Rev. C. 1994. V. 49. P. 1845-1858.</mixed-citation><mixed-citation xml:lang="en">Helmer R., Reich C. W. An excited state of 229Th at 3.5 eV // Phys. Rev. C. 1994. V. 49. P. 1845-1858.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Beck B. R., Becker J. A., Beiersdorfer P. e. a. Energy splitting of the ground-state doublet in the nucleus 229Th // Phys. Rev. Lett. 2007. V.109. P. 142501.</mixed-citation><mixed-citation xml:lang="en">Beck B. R., Becker J. A., Beiersdorfer P. e. a. Energy splitting of the ground-state doublet in the nucleus 229Th // Phys. Rev. Lett. 2007. V.109. P. 142501.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Beck B. R., Wu C.Y., Beiersdorfer P. e. a. Improved value for the energy splitting of the ground-state doublet in the nucleus 229mTh // Proc. 12th International Conference on Nuclear Reaction Mechanisms Varenna. Italy, 2009. LLNL-PROC-415170. [Электрон. версия] https://e-reports-ext.llnl.gov/pdf/375773.pdf (дата обращения: 16.11.2017).</mixed-citation><mixed-citation xml:lang="en">Beck B. R., Wu C.Y., Beiersdorfer P. e. a. Improved value for the energy splitting of the ground-state doublet in the nucleus 229mTh // Proc. 12th International Conference on Nuclear Reaction Mechanisms Varenna. Italy, 2009. LLNL-PROC-415170. [Электрон. версия] https://e-reports-ext.llnl.gov/pdf/375773.pdf (дата обращения: 16.11.2017).</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Karpeshin F. F., Trzhaskovskaya M. B. Impact of the electron environment on the lifetime of the 229Thm low-lying isomer // Phys. Rev. C. 2007. V. 76. P. 054313.</mixed-citation><mixed-citation xml:lang="en">Karpeshin F. F., Trzhaskovskaya M. B. Impact of the electron environment on the lifetime of the 229Thm low-lying isomer // Phys. Rev. C. 2007. V. 76. P. 054313.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">L. von der Wense. On the direct detection of 229mTh: Ph.D. thesis, Ludwig-Maximilians-Universitat at Munchen, Germany (2016). [Электрон. версия] https://edoc.ub.unimuenchen.de/20492/7/ Wense Lars von der.pdf (дата обращения: 16.11.2017).</mixed-citation><mixed-citation xml:lang="en">L. von der Wense. On the direct detection of 229mTh: Ph.D. thesis, Ludwig-Maximilians-Universitat at Munchen, Germany (2016). [Электрон. версия] https://edoc.ub.unimuenchen.de/20492/7/ Wense Lars von der.pdf (дата обращения: 16.11.2017).</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Vorykhalov O. V., Koltsov V.V. Search for an isomeric transition of energy below 5 eV in 229Th nucleus // Bull. Russ. Acad. Sci.: Physics. 1995. V. 59. P. 20-24.</mixed-citation><mixed-citation xml:lang="en">Vorykhalov O. V., Koltsov V.V. Search for an isomeric transition of energy below 5 eV in 229Th nucleus // Bull. Russ. Acad. Sci.: Physics. 1995. V. 59. P. 20-24.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Strizhov V. F., Tkalya E. V. Decay channel of low-lying isomer state of the 229Th nucleus. Possibilities of experimental investigation // Sov. Phys. JETP. 1991. V. 72. P. 387-390.</mixed-citation><mixed-citation xml:lang="en">Strizhov V. F., Tkalya E. V. Decay channel of low-lying isomer state of the 229Th nucleus. Possibilities of experimental investigation // Sov. Phys. JETP. 1991. V. 72. P. 387-390.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Tkalya E. V., Varlamov V. O., Lomonosov V. V., Nikulin S. A. Processes of the nuclear isomer 229mTh(3/2+, 3.5 ∙ 1.0 eV) resonant excitation by optical photons // Phys. Scripta. 1996. V. 53. P. 296-299.</mixed-citation><mixed-citation xml:lang="en">Tkalya E. V., Varlamov V. O., Lomonosov V. V., Nikulin S. A. Processes of the nuclear isomer 229mTh(3/2+, 3.5 ∙ 1.0 eV) resonant excitation by optical photons // Phys. Scripta. 1996. V. 53. P. 296-299.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Tkalya E. V., Zherikin A. N., Zhudov V. I. Decay of the low-energy nuclear isomer 229Thm(3/2+,3.5 ∙ 1.0 eV) in solids (dielectrics and metals): a new scheme of experimental research // Phys. Rev. C. 2000. V. 61. P. 064308.</mixed-citation><mixed-citation xml:lang="en">Tkalya E. V., Zherikin A. N., Zhudov V. I. Decay of the low-energy nuclear isomer 229Thm(3/2+,3.5 ∙ 1.0 eV) in solids (dielectrics and metals): a new scheme of experimental research // Phys. Rev. C. 2000. V. 61. P. 064308.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Peik E., Tamm C. Nuclear laser spectroscopy of the 3.5 eV transition in 229Th // Europhys. Lett. 2003. V.1. P. 181-186.</mixed-citation><mixed-citation xml:lang="en">Peik E., Tamm C. Nuclear laser spectroscopy of the 3.5 eV transition in 229Th // Europhys. Lett. 2003. V.1. P. 181-186.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Minkov N., Paly A. Reduced transition probabilities for the gamma decay of the 7:8 eV isomer in 229Th // Phys. Rev. Lett. 2017. V. 118. P. 212501.</mixed-citation><mixed-citation xml:lang="en">Minkov N., Paly A. Reduced transition probabilities for the gamma decay of the 7:8 eV isomer in 229Th // Phys. Rev. Lett. 2017. V. 118. P. 212501.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Tkalya E. V., Schneider C., Jeet J., Hudson E. R. Radiative lifetime and energy of the low-energy isomeric level in 229Th // Phys. Rev. C 2015. V. 92. P. 054324.</mixed-citation><mixed-citation xml:lang="en">Tkalya E. V., Schneider C., Jeet J., Hudson E. R. Radiative lifetime and energy of the low-energy isomeric level in 229Th // Phys. Rev. C 2015. V. 92. P. 054324.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Campbell C. J., Radnaev A. G., Kuzmich A., Dzuba V. A., Flambaum V. V., Derevianko A. Single-ion nuclear clock for metrology at the 19th decimal place // Phys. Rev. Lett. 2012. V.108. P. 120802.</mixed-citation><mixed-citation xml:lang="en">Campbell C. J., Radnaev A. G., Kuzmich A., Dzuba V. A., Flambaum V. V., Derevianko A. Single-ion nuclear clock for metrology at the 19th decimal place // Phys. Rev. Lett. 2012. V.108. P. 120802.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Campbell C. J., Radnaev A. G., Kuzmich A. Wigner crystals of 229Th for optical excitation of the nuclear isomer // Phys. Rev. Lett. 2011. V.106. P. 223001.</mixed-citation><mixed-citation xml:lang="en">Campbell C. J., Radnaev A. G., Kuzmich A. Wigner crystals of 229Th for optical excitation of the nuclear isomer // Phys. Rev. Lett. 2011. V.106. P. 223001.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Zimmermann K. Experiments towards optical nuclear spectroscopy with thorium-229: Ph.D. thesis, University of Hannover, Germany (2010).</mixed-citation><mixed-citation xml:lang="en">Zimmermann K. Experiments towards optical nuclear spectroscopy with thorium-229: Ph.D. thesis, University of Hannover, Germany (2010).</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Borisyuk P. V., Vasil'ev P. S., Derevyashkin O. P., t. a. Trapping, retention and laser cooling of Th3+ ions in a multisection linear quadrupole trap // Quantum Electronics. 2017. V. 47. P. 406-411.</mixed-citation><mixed-citation xml:lang="en">Borisyuk P. V., Vasil'ev P. S., Derevyashkin O. P., t. a. Trapping, retention and laser cooling of Th3+ ions in a multisection linear quadrupole trap // Quantum Electronics. 2017. V. 47. P. 406-411.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Rellergert W. G., DeMille D., Greco R. R., Hehlen M. P., Torgerson J. R., Hudson E. R. Constraining the evolution of the fundamental constants with a solid-state optical frequency reference based on the 229Th nucleus // Phys. Rev. Lett. 2010. V.104. P. 200802.</mixed-citation><mixed-citation xml:lang="en">Rellergert W. G., DeMille D., Greco R. R., Hehlen M. P., Torgerson J. R., Hudson E. R. Constraining the evolution of the fundamental constants with a solid-state optical frequency reference based on the 229Th nucleus // Phys. Rev. Lett. 2010. V.104. P. 200802.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Kazakov G. A., Litvinov A. N., Romanenko V. I., Yatsenko L. P., Romanenko A. V., Schreitl M., Winkler G. and Schumm T. Performance of a 229Thorium solid-state nuclear clock // New Jour. Phys. 2014. P. 083019.</mixed-citation><mixed-citation xml:lang="en">Kazakov G. A., Litvinov A. N., Romanenko V. I., Yatsenko L. P., Romanenko A. V., Schreitl M., Winkler G. and Schumm T. Performance of a 229Thorium solid-state nuclear clock // New Jour. Phys. 2014. P. 083019.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">von der Wense L., Seiferle B., Laatiaoui M., Neumayr J. B., Maier H.-J., Wirth H.-F., Mokry C., Runke J., Eberhardt K., Düllmann C. E., Trautmann N. G., Thirolf P. G. Direct detection of the 229Th nuclear clock transition // Nature. 2016. V. 533. P. 47-51.</mixed-citation><mixed-citation xml:lang="en">von der Wense L., Seiferle B., Laatiaoui M., Neumayr J. B., Maier H.-J., Wirth H.-F., Mokry C., Runke J., Eberhardt K., Düllmann C. E., Trautmann N. G., Thirolf P. G. Direct detection of the 229Th nuclear clock transition // Nature. 2016. V. 533. P. 47-51.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">B. Seiferle, L. von der Wense, P.G. Thirolf, Feasibility study of internal conversion electron spectroscopy of 229mTh // Eur. Phys. J. A. 2017. V. 53. P. 108-113.</mixed-citation><mixed-citation xml:lang="en">B. Seiferle, L. von der Wense, P.G. Thirolf, Feasibility study of internal conversion electron spectroscopy of 229mTh // Eur. Phys. J. A. 2017. V. 53. P. 108-113.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Kazakov G. A., Schauer V., Schwestka J. e. a. Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter // Nucl. Instrum. Methods A. 2014. V. 735. P. 229-239.</mixed-citation><mixed-citation xml:lang="en">Kazakov G. A., Schauer V., Schwestka J. e. a. Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter // Nucl. Instrum. Methods A. 2014. V. 735. P. 229-239.</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Schneider P. Spektroskopische Messungen an Thorium-229 mit einem Detektor-Array aus metallischen magnetischen Kalorimetern, Master thesis, Ruprecht-Karls-Universitat Heidelberg, Germany (2016).</mixed-citation><mixed-citation xml:lang="en">Schneider P. Spektroskopische Messungen an Thorium-229 mit einem Detektor-Array aus metallischen magnetischen Kalorimetern, Master thesis, Ruprecht-Karls-Universitat Heidelberg, Germany (2016).</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Ponce F. High accuracy measurement of the nuclear decay of U-235m and search for the nuclear decay of Th-229m: Ph.D. thesis, University of California, USA (2017).</mixed-citation><mixed-citation xml:lang="en">Ponce F. High accuracy measurement of the nuclear decay of U-235m and search for the nuclear decay of Th-229m: Ph.D. thesis, University of California, USA (2017).</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Safronova M. Elusive tranition spotted in thorium // Nature. 2016. V. 533. P. 44-45.</mixed-citation><mixed-citation xml:lang="en">Safronova M. Elusive tranition spotted in thorium // Nature. 2016. V. 533. P. 44-45.</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Seiferle B., L. von der Wense, Thirolf P.G. Lifetime measurement of the 229Th nuclear isomer // Phys. Rev. Lett. 2017. V. 118. P. 042501.</mixed-citation><mixed-citation xml:lang="en">Seiferle B., L. von der Wense, Thirolf P.G. Lifetime measurement of the 229Th nuclear isomer // Phys. Rev. Lett. 2017. V. 118. P. 042501.</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Flambaum V. V. Enhanced effect of temporal variation of the fine structure constant and the strong interaction in 229Th // Phys. Rev. Lett. 2006. V. 97. P. 092502.</mixed-citation><mixed-citation xml:lang="en">Flambaum V. V. Enhanced effect of temporal variation of the fine structure constant and the strong interaction in 229Th // Phys. Rev. Lett. 2006. V. 97. P. 092502.</mixed-citation></citation-alternatives></ref><ref id="cit28"><label>28</label><citation-alternatives><mixed-citation xml:lang="ru">Cingoz A., Yost D.C., Allison T.K., Ruehl A., Fermann M.E., Hartl I., Ye J. e. a. Direct frequency comb spectroscopy in the extreme ultraviolet // Nature. 2012. V. 482. P. 68-71.</mixed-citation><mixed-citation xml:lang="en">Cingoz A., Yost D.C., Allison T.K., Ruehl A., Fermann M.E., Hartl I., Ye J. e. a. Direct frequency comb spectroscopy in the extreme ultraviolet // Nature. 2012. V. 482. P. 68-71.</mixed-citation></citation-alternatives></ref><ref id="cit29"><label>29</label><citation-alternatives><mixed-citation xml:lang="ru">Cavaletto S. M., Harman Z., Ott C., Buth C., Thomas Pfeifer T., Christoph H. Keitel C. H. e. a. Broadband high-resolution x-ray frequency combs // Nature Photonics. 2014. V. 8. P. 520-523.</mixed-citation><mixed-citation xml:lang="en">Cavaletto S. M., Harman Z., Ott C., Buth C., Thomas Pfeifer T., Christoph H. Keitel C. H. e. a. Broadband high-resolution x-ray frequency combs // Nature Photonics. 2014. V. 8. P. 520-523.</mixed-citation></citation-alternatives></ref><ref id="cit30"><label>30</label><citation-alternatives><mixed-citation xml:lang="ru">NNDC interactive chart of nuclides. [Офиц. cайт] https://www.nndc.bnl.gov/chart (дата обращения: 16.11.2017).</mixed-citation><mixed-citation xml:lang="en">NNDC interactive chart of nuclides. [Офиц. cайт] https://www.nndc.bnl.gov/chart (дата обращения: 16.11.2017).</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
