Towards a nuclear clock with Thorium-229

Resultado final

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.

Publicaciones

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

Autores: Simon Stellmer, Matthias Schreitl, Georgy A. Kazakov, Johannes H. Sterba, Thorsten Schumm
Publicado en: Physical Review C, Edición 94/1, 2016, ISSN 2469-9985
Editor: American Physical Society
DOI: 10.1103/PhysRevC.94.014302

Towards a measurement of the nuclear clock transition in 229 Th

Autores: Simon Stellmer, Matthias Schreitl, Georgy Kazakov, Koji Yoshimura, Thorsten Schumm
Publicado en: Journal of Physics: Conference Series, Edición 723, 2016, Página(s) 012059, ISSN 1742-6588
Editor: Institute of Physics
DOI: 10.1088/1742-6596/723/1/012059

Feasibility study of internal conversion electron spectroscopy of 229mTh

Autores: Benedict Seiferle, Lars von der Wense, Peter G. Thirolf
Publicado en: The European Physical Journal A, Edición 53/5, 2017, ISSN 1434-6001
Editor: Springer Verlag
DOI: 10.1140/epja/i2017-12294-5

Nubis et Nuclei: A Study on Noise and Precision

Autores: Kerstin Ergenzinger, Thorsten Schumm, Simon Stellmer
Publicado en: Leonardo, 2017, ISSN 0024-094X
Editor: 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

Autores: Johannes Weitenberg, Andreas Vernaleken, Jan Schulte, Akira Ozawa, Thomas Sartorius, Vladimir Pervak, Hans-Dieter Hoffmann, Thomas Udem, Peter Russbüldt, Theodor W. Hänsch
Publicado en: Optics Express, Edición 25/17, 2017, Página(s) 20502, ISSN 1094-4087
Editor: 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

Autores: Nikolay Minkov, Adriana Pálffy
Publicado en: Physical Review Letters, Edición 118/21, 2017, ISSN 0031-9007
Editor: American Physical Society
DOI: 10.1103/PhysRevLett.118.212501

A Laser Excitation Scheme for Th 229 m

Autores: Lars von der Wense, Benedict Seiferle, Simon Stellmer, Johannes Weitenberg, Georgy Kazakov, Adriana Pálffy, Peter G. Thirolf
Publicado en: Physical Review Letters, Edición 119/13, 2017, ISSN 0031-9007
Editor: 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

Autores: Johannes Weitenberg, Tobias Saule, Jan Schulte, Peter Rusbuldt
Publicado en: IEEE Journal of Quantum Electronics, Edición 53/6, 2017, Página(s) 1-4, ISSN 0018-9197
Editor: Institute of Electrical and Electronics Engineers
DOI: 10.1109/JQE.2017.2761883

Optomechanically induced transparency of x-rays via optical control

Autores: Wen-Te Liao, Adriana Pálffy
Publicado en: Scientific Reports, Edición 7/1, 2017, ISSN 2045-2322
Editor: Nature Publishing Group
DOI: 10.1038/s41598-017-00428-w

Internal conversion from excited electronic states of Th 229 ions

Autores: Pavlo V. Bilous, Georgy A. Kazakov, Iain D. Moore, Thorsten Schumm, Adriana Pálffy
Publicado en: Physical Review A, Edición 95/3, 2017, ISSN 2469-9926
Editor: American Physical Society
DOI: 10.1103/PhysRevA.95.032503

Lifetime Measurement of the Th 229 nuclear isomer

Autores: Benedict Seiferle, Lars von der Wense, Peter G. Thirolf
Publicado en: Physical Review Letters, Edición 118/4, 2017, ISSN 0031-9007
Editor: 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

Autores: Simon Stellmer, Yudai Shigekawa, Veronika Rosecker, Georgy A. Kazakov, Yoshitaka Kasamatsu, Yuki Yasuda, Atsushi Shinohara, Thorsten Schumm
Publicado en: Physical Review C, Edición 98/1, 2018, ISSN 2469-9985
Editor: American Physical Society
DOI: 10.1103/physrevc.98.014317

Attempt to optically excite the nuclear isomer in Th 229

Autores: Simon Stellmer, Georgy Kazakov, Matthias Schreitl, Hendrik Kaser, Michael Kolbe, Thorsten Schumm
Publicado en: Physical Review A, Edición 97/6, 2018, ISSN 2469-9926
Editor: American Physical Society
DOI: 10.1103/PhysRevA.97.062506

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

Autores: 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
Publicado en: Physical Review C, Edición 97/2, 2018, ISSN 2469-9985
Editor: American Physical Sciety
DOI: 10.1103/physrevc.97.024607

Laser spectroscopic characterization of the nuclear-clock isomer 229mTh

Autores: Johannes Thielking, Maxim V. Okhapkin, Przemysław Głowacki, David M. Meier, Lars von der Wense, Benedict Seiferle, Christoph E. Düllmann, Peter G. Thirolf, Ekkehard Peik
Publicado en: Nature, Edición 556/7701, 2018, Página(s) 321-325, ISSN 0028-0836
Editor: 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

Autores: J. Seres, E. Seres, C. Serrat, T. Schumm
Publicado en: Optics Express, Edición 26/17, 2018, Página(s) 21900, ISSN 1094-4087
Editor: Optical Society of America
DOI: 10.1364/oe.26.021900

Nuclear Charge Radii of Th 229 from Isotope and Isomer Shifts

Autores: M. S. Safronova, S. G. Porsev, M. G. Kozlov, J. Thielking, M. V. Okhapkin, P. Głowacki, D. M. Meier, E. Peik
Publicado en: Physical Review Letters, Edición 121/21, 2018, ISSN 0031-9007
Editor: American Physical Society
DOI: 10.1103/physrevlett.121.213001

Collective effects in Th 229 -doped crystals

Autores: Brenden S. Nickerson, Wen-Te Liao, Adriana Pálffy
Publicado en: Physical Review A, Edición 98/6, 2018, ISSN 2469-9926
Editor: 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

Autores: J. Seres, E. Seres, C. Serrat, E. C. Young, J. S. Speck, T. Schumm
Publicado en: Optics Express, Edición 27/5, 2019, Página(s) 6618, ISSN 1094-4087
Editor: Optical Society of America
DOI: 10.1364/oe.27.006618

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

Autores: D.-M. Meier, J. Thielking, P. Głowacki, M. V. Okhapkin, R. A. Müller, A. Surzhykov, E. Peik
Publicado en: Physical Review A, Edición 99/5, 2019, ISSN 2469-9926
Editor: American Physical Society
DOI: 10.1103/physreva.99.052514

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

Autores: 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
Publicado en: Physical Review A, Edición 98/2, 2018, ISSN 2469-9926
Editor: American Physical Society
DOI: 10.1103/PhysRevA.98.020503

Electric quadrupole channel of the 7.8 eV Th 229 transition

Autores: Pavlo V. Bilous, Nikolay Minkov, Adriana Pálffy
Publicado en: Physical Review C, Edición 97/4, 2018, ISSN 2469-9985
Editor: APS
DOI: 10.1103/physrevc.97.044320

Theoretical Predictions for the Magnetic Dipole Moment of Th 229 m

Autores: Nikolay Minkov, Adriana Pálffy
Publicado en: Physical Review Letters, Edición 122/16, 2019, ISSN 0031-9007
Editor: American Physical Society
DOI: 10.1103/physrevlett.122.162502

Towards a 229Th-Based Nuclear Clock

Autores: L. von der Wense, B. Seiferle, P. G. Thirolf
Publicado en: Measurement Techniques, Edición 60/12, 2018, Página(s) 1178-1192, ISSN 0543-1972
Editor: 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

Autores: Peter G. Thirolf, Benedict Seiferle, Lars der Wense
Publicado en: Annalen der Physik, Edición 531/5, 2018, Página(s) 1800381, ISSN 0003-3804
Editor: A Hüthig
DOI: 10.1002/andp.201800381

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

Autores: Peter G. Thirolf, Benedict Seiferle, Lars von der Wense
Publicado en: Journal of Physics B: Atomic, Molecular and Optical Physics, 2019, ISSN 0953-4075
Editor: 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

Autores: Lars von der Wense, Benedict Seiferle, Ines Amersdorffer, Peter G. Thirolf
Publicado en: Journal of Visualized Experiments, Edición 147, 2019, ISSN 1940-087X
Editor: MYJoVE Corporation
DOI: 10.3791/58516

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

Autores: 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
Publicado en: Hyperfine Interactions, Edición 240/1, 2019, ISSN 0304-3843
Editor: 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

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

Energy of the 229Th nuclear clock transition

Autores: 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
Publicado en: Nature, Edición 573/7773, 2019, Página(s) 243-246, ISSN 0028-0836
Editor: Nature Publishing Group
DOI: 10.1038/s41586-019-1533-4

X-ray pumping of the 229Th nuclear clock isomer

Autores: 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
Publicado en: Nature, Edición 573/7773, 2019, Página(s) 238-242, ISSN 0028-0836
Editor: Nature Publishing Group
DOI: 10.1038/s41586-019-1542-3

Nuclear clocks based on resonant excitation of γ-transitions

Autores: Ekkehard Peik, Maxim Okhapkin
Publicado en: Comptes Rendus Physique, Edición 16/5, 2015, Página(s) 516-523, ISSN 1631-0705
Editor: Elsevier Masson
DOI: 10.1016/j.crhy.2015.02.007

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

Autores: L.v.d. Wense, B. Seiferle, M. Laatiaoui, P.G. Thirolf
Publicado en: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Edición 376, 2016, Página(s) 260-264, ISSN 0168-583X
Editor: Elsevier BV
DOI: 10.1016/j.nimb.2015.12.049

Radioluminescence and photoluminescence of Th:CaF2 crystals

Autores: Simon Stellmer, Matthias Schreitl, Thorsten Schumm
Publicado en: Scientific Reports, Edición 5, 2015, Página(s) 15580, ISSN 2045-2322
Editor: Nature Publishing Group
DOI: 10.1038/srep15580

Direct detection of the 229Th nuclear clock transition

Autores: 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
Publicado en: Nature, Edición 533/7601, 2016, Página(s) 47-51, ISSN 0028-0836
Editor: Nature Publishing Group
DOI: 10.1038/nature17669

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

Autores: M. V. Okhapkin, D. M. Meier, E. Peik, M. S. Safronova, M. G. Kozlov, S. G. Porsev
Publicado en: Physical Review A, Edición 92/2, 2015, Página(s) 020503, ISSN 1094-1622
Editor: 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

Autores: Benedict Seiferle, Lars von der Wense, Mustapha Laatiaoui, Peter G. Thirolf
Publicado en: The European Physical Journal D, Edición 70/3, 2016, Página(s) 58, ISSN 1434-6060
Editor: Springer Verlag
DOI: 10.1140/epjd/e2016-60653-4

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

Autores: A Yamaguchi, M Kolbe, H Kaser, T Reichel, A Gottwald, E Peik
Publicado en: New Journal of Physics, Edición 17/5, 2015, Página(s) 053053, ISSN 1367-2630
Editor: Institute of Physics Publishing
DOI: 10.1088/1367-2630/17/5/053053

Von der Atomuhr zur Kernuhr

Autores: Simon Stellmer
Publicado en: Physik Journal, Edición 04/2017, 2017, Página(s) 16-17, ISSN 1617-9439
Editor: Wiley-VCH Verlag

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