Towards a nuclear clock with Thorium-229

Livrables

Micro-calorimeters enable high-resolution spectroscopy of gamma photons. This report summarizes the attempt to resolve the 229Th nuclear gound-state doublet structure. A successful measurement would allow for a determination of the energy of the isomeric state.

WP1 progress report 1

This first report of WP 1 will summarize technological advances in the quest of detecting the Th isomer state. The latest state of all four experimental groups (UHEI, LMU, JYU, and TU WIEN) will be described.

Progress report thorium samples

TU WIEN will fabricate 229Th samples, as required by PTB for an ion trap sputter source (tasks 2.1 and 2.2), for collision targets at JYU (task 1.3), and for crystal doping at TU WIEN (task 2.3). The chemical processing of the 229Th will be described, as well as careful investigation of the samples' radioactivity and purity.

WP2 progress report 1

This report will contain new values on the electronic level structure of 229Th+, as well as all relevant advances in the investigation of fundamental building blocks of a nuclear optical clock.

WP2 progress report 2

This report will contain results on the Th:CaF2 crystal characterization, on the spectroscopy of electronic states of 229gTh+, as well as relevant advances in the investigation of fundamental building blocks of a nuclear optical clock.

Collective effects

Collective effects might improve spectroscopy performance tremendously. Theoretical investigations on this topic will be described in this report.

Check meeting 3

Scientific report covering the third RP (M31-M48).

Data management plan

A data management plan will be developed.

WP1 progress report 3

This progress report will summarize all relevant advances on the characterization of the 229Th isomeric state.

WP1 progress report 2

This progress report will summarize all relevant advances on the characterization of the 229Th isomeric state.

Progress report uranium samples

233U samples are required by UHEI for gamma-spectroscopy (task 1.1), by LMU as ion-beam source (task 1.2), by TU WIEN for crystal doping (task 1.4), and potentially JYU as collision target. The chemical procedures developed to produce the required samples will be decribed in a report, along with quantitative measurements of radioactivity, purity, and other relevant parameters.

WP2 progress report 3

This report will contain new values on the electronic level structure of 229Th+, as well as all relevant advances in the investigation of fundamental building blocks of a nuclear optical clock.

VUV comb evaluation

MPG/MPQ will deliver a report on the design and benchmark specifications of a future VUV frequency comb dedicated for thorium, based on the existing 175 nm laser.

VUV cw laser system

The previous three deliverables covered by TOPTICA concerned the development of the three intergal sub-systems of a tunable cw VUV laser system. These subsystems are now integrated into a single transportable unit. Extensive tests of the entire system are performed and will be detailed in a report.

Portable detection unit

A portable detection unit will be developed, centered around a 229Th:CaF2 crystal to be illuminated by light sourced provided by PTB (MLS in Berlin) or TOPTICA (cw VUV solid state laser). On the detection side, either PMTs or a VUV monochromator might be employed.

Image film

Half-way through the 4-year project duration, an image film will be produced. The film will be targeted at a non-expert audience. It will cover the physics behind the research, the daily work of scientists, as well as the current status of the project. The film will be uploaded to online platforms such as the project webpage and facebook account.

International conference

An international conference will be organized, bringing together experts from the field of thorium research, as well as from adjacent research topics.

Project webpage

Brief description of the structure of the website.

Publications

Feasibility study of measuring the Th 229 nuclear isomer transition with U 233 -doped crystals

Auteurs: Simon Stellmer, Matthias Schreitl, Georgy A. Kazakov, Johannes H. Sterba, Thorsten Schumm
Publié dans: Physical Review C, Numéro 94/1, 2016, ISSN 2469-9985
Éditeur: American Physical Society
DOI: 10.1103/PhysRevC.94.014302

Towards a measurement of the nuclear clock transition in 229 Th

Auteurs: Simon Stellmer, Matthias Schreitl, Georgy Kazakov, Koji Yoshimura, Thorsten Schumm
Publié dans: Journal of Physics: Conference Series, Numéro 723, 2016, Page(s) 012059, ISSN 1742-6588
Éditeur: Institute of Physics
DOI: 10.1088/1742-6596/723/1/012059

Feasibility study of internal conversion electron spectroscopy of 229mTh

Auteurs: Benedict Seiferle, Lars von der Wense, Peter G. Thirolf
Publié dans: The European Physical Journal A, Numéro 53/5, 2017, ISSN 1434-6001
Éditeur: Springer Verlag
DOI: 10.1140/epja/i2017-12294-5

Nubis et Nuclei: A Study on Noise and Precision

Auteurs: Kerstin Ergenzinger, Thorsten Schumm, Simon Stellmer
Publié dans: Leonardo, 2017, ISSN 0024-094X
Éditeur: MIT Press
DOI: 10.1162/LEON_a_01467

Multi-pass-cell-based nonlinear pulse compression to 115 fs at 75 µJ pulse energy and 300 W average power

Auteurs: Johannes Weitenberg, Andreas Vernaleken, Jan Schulte, Akira Ozawa, Thomas Sartorius, Vladimir Pervak, Hans-Dieter Hoffmann, Thomas Udem, Peter Russbüldt, Theodor W. Hänsch
Publié dans: Optics Express, Numéro 25/17, 2017, Page(s) 20502, ISSN 1094-4087
Éditeur: Optical Society of America
DOI: 10.1364/OE.25.020502

Reduced Transition Probabilities for the Gamma Decay of the 7.8 eV Isomer in Th 229

Auteurs: Nikolay Minkov, Adriana Pálffy
Publié dans: Physical Review Letters, Numéro 118/21, 2017, ISSN 0031-9007
Éditeur: American Physical Society
DOI: 10.1103/PhysRevLett.118.212501

A Laser Excitation Scheme for Th 229 m

Auteurs: Lars von der Wense, Benedict Seiferle, Simon Stellmer, Johannes Weitenberg, Georgy Kazakov, Adriana Pálffy, Peter G. Thirolf
Publié dans: Physical Review Letters, Numéro 119/13, 2017, ISSN 0031-9007
Éditeur: American Physical Society
DOI: 10.1103/PhysRevLett.119.132503

Nonlinear Pulse Compression to Sub-40 fs at $4.5~\mu$ J Pulse Energy by Multi-Pass-Cell Spectral Broadening

Auteurs: Johannes Weitenberg, Tobias Saule, Jan Schulte, Peter Rusbuldt
Publié dans: IEEE Journal of Quantum Electronics, Numéro 53/6, 2017, Page(s) 1-4, ISSN 0018-9197
Éditeur: Institute of Electrical and Electronics Engineers
DOI: 10.1109/JQE.2017.2761883

Optomechanically induced transparency of x-rays via optical control

Auteurs: Wen-Te Liao, Adriana Pálffy
Publié dans: Scientific Reports, Numéro 7/1, 2017, ISSN 2045-2322
Éditeur: Nature Publishing Group
DOI: 10.1038/s41598-017-00428-w

Internal conversion from excited electronic states of Th 229 ions

Auteurs: Pavlo V. Bilous, Georgy A. Kazakov, Iain D. Moore, Thorsten Schumm, Adriana Pálffy
Publié dans: Physical Review A, Numéro 95/3, 2017, ISSN 2469-9926
Éditeur: American Physical Society
DOI: 10.1103/PhysRevA.95.032503

Lifetime Measurement of the Th 229 nuclear isomer

Auteurs: Benedict Seiferle, Lars von der Wense, Peter G. Thirolf
Publié dans: Physical Review Letters, Numéro 118/4, 2017, ISSN 0031-9007
Éditeur: American Physical Society
DOI: 10.1103/PhysRevLett.118.042501

Toward an energy measurement of the internal conversion electron in the deexcitation of the Th 229 isomer

Auteurs: Simon Stellmer, Yudai Shigekawa, Veronika Rosecker, Georgy A. Kazakov, Yoshitaka Kasamatsu, Yuki Yasuda, Atsushi Shinohara, Thorsten Schumm
Publié dans: Physical Review C, Numéro 98/1, 2018, ISSN 2469-9985
Éditeur: American Physical Society
DOI: 10.1103/physrevc.98.014317

Attempt to optically excite the nuclear isomer in Th 229

Auteurs: Simon Stellmer, Georgy Kazakov, Matthias Schreitl, Hendrik Kaser, Michael Kolbe, Thorsten Schumm
Publié dans: Physical Review A, Numéro 97/6, 2018, ISSN 2469-9926
Éditeur: American Physical Society
DOI: 10.1103/PhysRevA.97.062506

Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of Hg 201

Auteurs: A. Yoshimi, H. Hara, T. Hiraki, Y. Kasamatsu, S. Kitao, Y. Kobayashi, K. Konashi, R. Masuda, T. Masuda, Y. Miyamoto, K. Okai, S. Okubo, R. Ozaki, N. Sasao, O. Sato, M. Seto, T. Schumm, Y. Shigekawa, S. Stellmer, K. Suzuki, S. Uetake, M. Watanabe, A. Yamaguchi, Y. Yasuda, Y. Yoda, K. Yoshimura, M. Yoshimura
Publié dans: Physical Review C, Numéro 97/2, 2018, ISSN 2469-9985
Éditeur: American Physical Sciety
DOI: 10.1103/physrevc.97.024607

Laser spectroscopic characterization of the nuclear-clock isomer 229mTh

Auteurs: Johannes Thielking, Maxim V. Okhapkin, Przemysław Głowacki, David M. Meier, Lars von der Wense, Benedict Seiferle, Christoph E. Düllmann, Peter G. Thirolf, Ekkehard Peik
Publié dans: Nature, Numéro 556/7701, 2018, Page(s) 321-325, ISSN 0028-0836
Éditeur: Nature Publishing Group
DOI: 10.1038/s41586-018-0011-8

Non-perturbative generation of DUV/VUV harmonics from crystal surfaces at 108 MHz repetition rate

Auteurs: J. Seres, E. Seres, C. Serrat, T. Schumm
Publié dans: Optics Express, Numéro 26/17, 2018, Page(s) 21900, ISSN 1094-4087
Éditeur: Optical Society of America
DOI: 10.1364/oe.26.021900

Nuclear Charge Radii of Th 229 from Isotope and Isomer Shifts

Auteurs: M. S. Safronova, S. G. Porsev, M. G. Kozlov, J. Thielking, M. V. Okhapkin, P. Głowacki, D. M. Meier, E. Peik
Publié dans: Physical Review Letters, Numéro 121/21, 2018, ISSN 0031-9007
Éditeur: American Physical Society
DOI: 10.1103/physrevlett.121.213001

Collective effects in Th 229 -doped crystals

Auteurs: Brenden S. Nickerson, Wen-Te Liao, Adriana Pálffy
Publié dans: Physical Review A, Numéro 98/6, 2018, ISSN 2469-9926
Éditeur: American Physical Society
DOI: 10.1103/physreva.98.062520

All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity

Auteurs: J. Seres, E. Seres, C. Serrat, E. C. Young, J. S. Speck, T. Schumm
Publié dans: Optics Express, Numéro 27/5, 2019, Page(s) 6618, ISSN 1094-4087
Éditeur: Optical Society of America
DOI: 10.1364/oe.27.006618

Electronic level structure of Th + in the range of the Th 229 m

Auteurs: D.-M. Meier, J. Thielking, P. Głowacki, M. V. Okhapkin, R. A. Müller, A. Surzhykov, E. Peik
Publié dans: Physical Review A, Numéro 99/5, 2019, ISSN 2469-9926
Éditeur: American Physical Society
DOI: 10.1103/physreva.99.052514

Hyperfine interaction with the Th 229 nucleus and its low-lying isomeric state

Auteurs: Robert A. Müller, Anna V. Maiorova, Stephan Fritzsche, Andrey V. Volotka, Randolf Beerwerth, Przemyslaw Glowacki, Johannes Thielking, David-Marcel Meier, Maksim Okhapkin, Ekkehard Peik, Andrey Surzhykov
Publié dans: Physical Review A, Numéro 98/2, 2018, ISSN 2469-9926
Éditeur: American Physical Society
DOI: 10.1103/PhysRevA.98.020503

Electric quadrupole channel of the 7.8 eV Th 229 transition

Auteurs: Pavlo V. Bilous, Nikolay Minkov, Adriana Pálffy
Publié dans: Physical Review C, Numéro 97/4, 2018, ISSN 2469-9985
Éditeur: APS
DOI: 10.1103/physrevc.97.044320

Theoretical Predictions for the Magnetic Dipole Moment of Th 229 m

Auteurs: Nikolay Minkov, Adriana Pálffy
Publié dans: Physical Review Letters, Numéro 122/16, 2019, ISSN 0031-9007
Éditeur: American Physical Society
DOI: 10.1103/physrevlett.122.162502

Towards a 229Th-Based Nuclear Clock

Auteurs: L. von der Wense, B. Seiferle, P. G. Thirolf
Publié dans: Measurement Techniques, Numéro 60/12, 2018, Page(s) 1178-1192, ISSN 0543-1972
Éditeur: Instrument Society of America
DOI: 10.1007/s11018-018-1337-1

Improving Our Knowledge on the 229m Thorium Isomer: Toward a Test Bench for Time Variations of Fundamental Constants

Auteurs: Peter G. Thirolf, Benedict Seiferle, Lars der Wense
Publié dans: Annalen der Physik, Numéro 531/5, 2018, Page(s) 1800381, ISSN 0003-3804
Éditeur: A Hüthig
DOI: 10.1002/andp.201800381

The 229-thorium isomer: doorway to the road from the atomic clock to the nuclear clock

Auteurs: Peter G. Thirolf, Benedict Seiferle, Lars von der Wense
Publié dans: Journal of Physics B: Atomic, Molecular and Optical Physics, 2019, ISSN 0953-4075
Éditeur: Institute of Physics Publishing
DOI: 10.1088/1361-6455/ab29b8

Preparing an Isotopically Pure <sup>229</sup>Th Ion Beam for Studies of <sup>229m</sup>Th

Auteurs: Lars von der Wense, Benedict Seiferle, Ines Amersdorffer, Peter G. Thirolf
Publié dans: Journal of Visualized Experiments, Numéro 147, 2019, ISSN 1940-087X
Éditeur: MYJoVE Corporation
DOI: 10.3791/58516

The concept of laser-based conversion electron Mössbauer spectroscopy for a precise energy determination of 229mTh

Auteurs: Lars C. von der Wense, Benedict Seiferle, Christian Schneider, Justin Jeet, Ines Amersdorffer, Nicolas Arlt, Florian Zacherl, Raphael Haas, Dennis Renisch, Patrick Mosel, Philip Mosel, Milutin Kovacev, Uwe Morgner, Christoph E. Düllmann, Eric R. Hudson, Peter G. Thirolf
Publié dans: Hyperfine Interactions, Numéro 240/1, 2019, ISSN 0304-3843
Éditeur: Kluwer Academic Publishers
DOI: 10.1007/s10751-019-1564-0

Towards a precise determination of the excitation energy of the Thorium nuclear isomer using a magnetic bottle spectrometer

Auteurs: Benedict Seiferle, Lars von der Wense, Ines Amersdorffer, Nicolas Arlt, Benjamin Kotulski, Peter G. Thirolf
Publié dans: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2019, ISSN 0168-583X
Éditeur: Elsevier BV
DOI: 10.1016/j.nimb.2019.03.043

Energy of the 229Th nuclear clock transition

Auteurs: Benedict Seiferle, Lars von der Wense, Pavlo V. Bilous, Ines Amersdorffer, Christoph Lemell, Florian Libisch, Simon Stellmer, Thorsten Schumm, Christoph E. Düllmann, Adriana Pálffy, Peter G. Thirolf
Publié dans: Nature, Numéro 573/7773, 2019, Page(s) 243-246, ISSN 0028-0836
Éditeur: Nature Publishing Group
DOI: 10.1038/s41586-019-1533-4

X-ray pumping of the 229Th nuclear clock isomer

Auteurs: Takahiko Masuda, Akihiro Yoshimi, Akira Fujieda, Hiroyuki Fujimoto, Hiromitsu Haba, Hideaki Hara, Takahiro Hiraki, Hiroyuki Kaino, Yoshitaka Kasamatsu, Shinji Kitao, Kenji Konashi, Yuki Miyamoto, Koichi Okai, Sho Okubo, Noboru Sasao, Makoto Seto, Thorsten Schumm, Yudai Shigekawa, Kenta Suzuki, Simon Stellmer, Kenji Tamasaku, Satoshi Uetake, Makoto Watanabe, Tsukasa Watanabe, Yuki Yasuda, Atsushi Y
Publié dans: Nature, Numéro 573/7773, 2019, Page(s) 238-242, ISSN 0028-0836
Éditeur: Nature Publishing Group
DOI: 10.1038/s41586-019-1542-3

Nuclear clocks based on resonant excitation of γ-transitions

Auteurs: Ekkehard Peik, Maxim Okhapkin
Publié dans: Comptes Rendus Physique, Numéro 16/5, 2015, Page(s) 516-523, ISSN 1631-0705
Éditeur: Elsevier Masson
DOI: 10.1016/j.crhy.2015.02.007

The extraction of 229Th3+ from a buffer-gas stopping cell

Auteurs: L.v.d. Wense, B. Seiferle, M. Laatiaoui, P.G. Thirolf
Publié dans: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Numéro 376, 2016, Page(s) 260-264, ISSN 0168-583X
Éditeur: Elsevier BV
DOI: 10.1016/j.nimb.2015.12.049

Radioluminescence and photoluminescence of Th:CaF2 crystals

Auteurs: Simon Stellmer, Matthias Schreitl, Thorsten Schumm
Publié dans: Scientific Reports, Numéro 5, 2015, Page(s) 15580, ISSN 2045-2322
Éditeur: Nature Publishing Group
DOI: 10.1038/srep15580

Direct detection of the 229Th nuclear clock transition

Auteurs: Lars von der Wense, Benedict Seiferle, Mustapha Laatiaoui, Jürgen B. Neumayr, Hans-Jörg Maier, Hans-Friedrich Wirth, Christoph Mokry, Jörg Runke, Klaus Eberhardt, Christoph E. Düllmann, Norbert G. Trautmann, Peter G. Thirolf
Publié dans: Nature, Numéro 533/7601, 2016, Page(s) 47-51, ISSN 0028-0836
Éditeur: Nature Publishing Group
DOI: 10.1038/nature17669

Observation of an unexpected negative isotope shift in Th + 229 and its theoretical explanation

Auteurs: M. V. Okhapkin, D. M. Meier, E. Peik, M. S. Safronova, M. G. Kozlov, S. G. Porsev
Publié dans: Physical Review A, Numéro 92/2, 2015, Page(s) 020503, ISSN 1094-1622
Éditeur: American Physical Society
DOI: 10.1103/PhysRevA.92.020503

A VUV detection system for the direct photonic identification of the first excited isomeric state of 229Th

Auteurs: Benedict Seiferle, Lars von der Wense, Mustapha Laatiaoui, Peter G. Thirolf
Publié dans: The European Physical Journal D, Numéro 70/3, 2016, Page(s) 58, ISSN 1434-6060
Éditeur: Springer Verlag
DOI: 10.1140/epjd/e2016-60653-4

Experimental search for the low-energy nuclear transition in 229 Th with undulator radiation

Auteurs: A Yamaguchi, M Kolbe, H Kaser, T Reichel, A Gottwald, E Peik
Publié dans: New Journal of Physics, Numéro 17/5, 2015, Page(s) 053053, ISSN 1367-2630
Éditeur: Institute of Physics Publishing
DOI: 10.1088/1367-2630/17/5/053053

Von der Atomuhr zur Kernuhr

Auteurs: Simon Stellmer
Publié dans: Physik Journal, Numéro 04/2017, 2017, Page(s) 16-17, ISSN 1617-9439
Éditeur: Wiley-VCH Verlag

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