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Your search keyword '"Hänsch, T. W."' showing total 257 results
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257 results on '"Hänsch, T. W."'

2. Is the proton radius a player in the redefinition of the International System of Units?

Author

Nez, F., Antognini, A., Amaro, F. D., Biraben, F., Cardoso, J. M. R., Covita, D., Dax, A., Dhawan, S., Fernandes, L., Giesen, A., Graf, T., Hänsch, T. W., Indelicato, P., Julien, L., Kao, C.-Y., Knowles, P. E., Le Bigot, E., Liu, Y.-W., Lopes, J. A. M., Ludhova, L., Monteiro, C. M. B., Mulhauser, F., Nebel, T., Rabinowitz, P., dos Santos, J. M. F., Schaller, L., Schuhmann, K., Schwob, C., Taqqu, D., Veloso, J. F. C. A., Kottmann, F., and Pohl, R.

Published
2011

3. Bose-Einstein Condensation in Microgravity

Author

van Zoest, T., Gaaloul, N., Singh, Y., Ahlers, H., Herr, W., Seidel, S. T., Ertmer, W., Rasel, E., Eckart, M., Kajari, E., Arnold, S., Nandi, G., Schleich, W. P., Walser, R., Vogel, A., Sengstock, K., Bongs, K., Lewoczko-Adamczyk, W., Schiemangk, M., Schuldt, T., Peters, A., Könemann, T., Müntinga, H., Lämmerzahl, C., Dittus, H., Steinmetz, T., Hänsch, T. W., and Reichel, J.

Published
2010
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5. The size of the proton: From the Lamb-shift in muonic hydrogen

Author

Nebel, T., Antognini, A., Amaro, F. D., Biraben, F., Cardoso, J. M. R., Covita, D. S., Dax, A., Dhawan, S., Fernandes, L. M. P., Giesen, A., Graf, T., Hänsch, T. W., Indelicato, P., Julien, L., Kao, C.-Y., Knowles, P., Kottmann, F., Le Bigot, E., Liu, Y.-W., Lopes, J. A. M., Ludhova, L., Monteiro, C. M. B., Mulhauser, F., Nez, F., Rabinowitz, P., dos Santos, J. M. F., Schaller, L. A., Schuhmann, K., Schwob, C., Taqqu, D., Veloso, J. F. C. A., and Pohl, R.

Published
2012
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6. The Lamb-shift experiment in Muonic helium

Author

Nebel, T., Amaro, F. D., Antognini, A., Biraben, F., Cardoso, J. M. R., Covita, D. S., Dax, A., Fernandes, L. M. P., Gouvea, A. L., Graf, T., Hänsch, T. W., Hildebrandt, M., Indelicato, P., Julien, L., Kirch, K., Kottmann, F., Liu, Y. -W., Monteiro, C. M. B., Nez, F., Santos, J. M. F. dos, Schuhmann, K., Taqqu, D., Veloso, J. F. C. A., Voss, A., and Pohl, R.

Published
2012
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12. Experiments towards resolving the proton charge radius puzzle

Author

Antognini A., Schuhmann K., Amaro F. D., Amaro P., Abdou-Ahmed M., Biraben F., Chen T.-L., Covita D. S., Dax A. J., Diepold M., Fernandes L. M. P., Franke B., Galtier S., Gouvea A. L., Götzfried J., Graf T., Hänsch T. W., Hildebrandt M., Indelicato P., Julien L., Kirch K., Knecht A., Kottmann F., Krauth J. J., Liu Y.-W., Machado J., Monteiro C. M. B., Mulhauser F., Nez F., Santos J. P., dos Santos J. M. F., Szabo C. I., Taqqu D., Veloso J. F. C. A., Voss A., Weichelt B., and Pohl R.

Subjects
Physics, QC1-999
Abstract

We review the status of the proton charge radius puzzle. Emphasis is given to the various experiments initiated to resolve the conflict between the muonic hydrogen results and the results from scattering and regular hydrogen spectroscopy.

Published
2016
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16. The Muonic Hydrogen Lamb Shift Experiment at PSI

Author

Kottmann, F., Amir, W., Biraben, F., Conde, C. A. N., Dhawan, S., Hänsch, T. W., Hartmann, F. J., Hughes, V. W., Huot, O., Indelicato, P., Julien, L., Knowles, P., Kazamias, S., Liu, Y.-W., Mulhauser, F., Nez, F., Pohl, R., Rabinowitz, P., dos Santos, J. M. F., Schaller, L. A., Schneuwly, H., Schott, W., Taqqu, D., and Veloso, J. F. C. A.

Published
2001
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19. Status of the muonic hydrogen Lamb-shift experiment

Author

Nebel, T., Amaro, F. D., Antognini, A., Biraben, F., Cardoso, J. MR, Conde, C. AN, Dax, A., Dhawan, S., Fernandes, L. MP, Giesen, A., Hänsch, T. W., Indelicato, P., Julien, L., Knowles, P. E., Kottmann, F., Le Bigot, E., Liu, Y. -W, Lopes, J. AM, Ludhova, L., Monteiro, C. MB, Mulhauser, F., Nez, F., Pohl, R., Rabinowitz, P., dos Santos, J. MF, Schaller, L. A., Schuhmann, K., Schwob, C., Taqqu, D., and Veloso, J FCA

Published
2007

20. Experimental test of special relativity by laser spectroscopy

Author

Novotny, C., Bernhardt, B., Ewald, G., Geppert, C., Gwinner, G., Hänsch, T. W., Holzwarth, R., Huber, G., Karpuk, S., Kluge, H.-J., Kühl, T., Nörtershäuser, W., Reinhardt, S., Saathoff, G., Schwalm, D., Udem, T., and Wolf, A.

Published
2007

28. The muonic hydrogen Lamb-shift experiment

Author

Pohl, R, Antognini, A, Amaro, F D, Biraben, F, Cardoso, J MR, Conde, C AN, Dax, A, Dhawan, S, Fernandes, L MP, Hänsch, T W, Hartmann, F J, Hughes, V W, Huot, O, Indelicato, P, Julien, L, Knowles, P E, Kottmann, F, Liu, Y-W, Ludhova, L, Monteiro, C MB, Mulhauser, F, Nez, F, Rabinowitz, P, dos Santos, J MF, Schaller, L A, Schwob, C, Taqqu, D, and Veloso, J FCA

Published
2005

37. Experiment to measure the Lamb shift in muonic hydrogen*

Author

Pohl, R., Biraben, F., Conde, C. A.N., Donche-Gay, C., Hänsch, T. W., Hartmann, F. J., Hauser, P., Hughes, V. W., Huot, O., Indelicato, P., Knowles, P., Kottmann, F., Liu, Y. -W., Mulhauser, F., Nez, F., Petitjean, C., Rabinowitz, P., Dos Santos, J. M.F., Schaller, L. A., Schneuwly, H., Schott, W., Simons, L. M., Taqqu, D., Trehin, F., and Veloso, J. F.C.A.

Published
2000

38. Laser spectroscopy of the Lamb shift in muonic hydrogen

Author

Taqqu, D., Biraben, F., Conde, C. A.N., Hänsch, T. W., Hartmann, F. J., Hauser, P., Indelicato, P., Knowles, P., Kottmann, F., Mulhauser, F., Petitjean, C., Pohl, R., Rabinowitz, P., Rosenfelder, R., Santos, J. M.F., Schott, W., Simons, L. M., and Veloso, J. F.C.A.

Published
1999

42. The proton radius puzzle

Author

Krauth, J. J., Schuhmann, K., Abdou Ahmed, M., Amaro, F. D., Amaro, P., Biraben, F., Cardoso, J. M. R., Carvalho, M. L., Covita, D. S., Dax, A., Dhawan, S., Diepold, M., Fernandes, L. M. P., Franke, B., Sandrine GALTIER, Giesen, A., Gouvea, A. L., Götzfried, J., Graf, T., Guerra, M., Haack, J., Hänsch, T. W., Hildebrandt, M., Indelicato, P., Julien, L., Kirch, K., Knecht, A., Knowles, P., Kottmann, F., O Le Bigot, E., W Liu, Y., Lopes, J. A. M., Ludhova, L., Machado, J., Monteiro, C. M. B., Mulhauser, F., Nebel, T., Nez, F., Rabinowitz, P., Rapisarda, E., Dos Santos, J. M. F., Santos, J. P., Schaller, L. A., Schwob, C., Szabo, C. I., Taqqu, D., Veloso, J. F. C. A., Voss, A., Weichelt, B., Willig, M., Pohl, R., Antognini, A., Laboratoire Kastler Brossel (LKB [Collège de France]), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Collège de France (CdF)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Laboratoire Kastler Brossel ( LKB (Lhomond) ), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris ( FRDPENS ), and Centre National de la Recherche Scientifique ( CNRS ) -École normale supérieure - Paris ( ENS Paris ) -Centre National de la Recherche Scientifique ( CNRS ) -École normale supérieure - Paris ( ENS Paris ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[PHYS]Physics [physics], [ PHYS ] Physics [physics], Atomic Physics (physics.atom-ph), FOS: Physical sciences, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Physics - Atomic Physics, laser, electron p: scattering, hydrogen: muonic atom, p: size, [ PHYS.PHYS.PHYS-GEN-PH ] Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Physics::Atomic Physics, spectrometer, deuterium: muonic atom, Nuclear Experiment, activity report
Abstract

High-precision measurements of the proton radius from laser spectroscopy of muonic hydrogen demonstrated up to six standard deviations smaller values than obtained from electron-proton scattering and hydrogen spectroscopy. The status of this discrepancy, which is known as the proton radius puzzle will be discussed in this paper, complemented with the new insights obtained from spectroscopy of muonic deuterium., Moriond 2017 conference, 8 pages, 4 figures

Published
2017

43. The solar gravitational redshift from HARPS-LFC Moon spectra: A test of the general theory of relativity.

Author

González Hernández, J. I., Rebolo, R., Pasquini, L., Lo Curto, G., Molaro, P., Caffau, E., Ludwig, H.-G., Steffen, M., Esposito, M., Suárez Mascareño, A., Toledo-Padrón, B., Probst, R. A., Hänsch, T. W., Holzwarth, R., Manescau, A., Steinmetz, T., Udem, Th., and Wilken, T.

Subjects
GENERAL relativity (Physics), SOLAR system, SOLAR photosphere, SPECTRAL lines, REDSHIFT, SOLAR spectra
Abstract

Context. The general theory of relativity predicts the redshift of spectral lines in the solar photosphere as a consequence of the gravitational potential of the Sun. This effect can be measured from a solar disk-integrated flux spectrum of the Sun's reflected light on Solar System bodies. Aims. The laser frequency comb (LFC) calibration system attached to the HARPS spectrograph offers the possibility of performing an accurate measurement of the solar gravitational redshift (GRS) by observing the Moon or other Solar System bodies. Here, we analyse the line shift observed in Fe absorption lines from five high-quality HARPS-LFC spectra of the Moon. Methods. We selected an initial sample of 326 photospheric Fe lines in the spectral range between 476–585 nm and measured their line positions and equivalent widths (EWs). Accurate line shifts were derived from the wavelength position of the core of the lines compared with the laboratory wavelengths of Fe lines. We also used a CO5BOLD 3D hydrodynamical model atmosphere of the Sun to compute 3D synthetic line profiles of a subsample of about 200 spectral Fe lines centred at their laboratory wavelengths. We fit the observed relatively weak spectral Fe lines (with EW< 180 mÅ) with the 3D synthetic profiles. Results. Convective motions in the solar photosphere do not affect the line cores of Fe lines stronger than about ∼150 mÅ. In our sample, only 15 Fe I lines have EWs in the range 150< EW(mÅ) < 550, providing a measurement of the solar GRS at 639 ± 14 m s−1, which is consistent with the expected theoretical value on Earth of ∼633.1 m s−1. A final sample of about 97 weak Fe lines with EW < 180 mÅ allows us to derive a mean global line shift of 638 ± 6 m s−1, which is in agreement with the theoretical solar GRS. Conclusions. These are the most accurate measurements of the solar GRS obtained thus far. Ultrastable spectrographs calibrated with the LFC over a larger spectral range, such as HARPS or ESPRESSO, together with a further improvement on the laboratory wavelengths, could provide a more robust measurement of the solar GRS and further testing of 3D hydrodynamical models. [ABSTRACT FROM AUTHOR]

Published
2020
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44. Transverse-mode coupling and diffraction loss in tunable Fabry-Pé rot microcavities

Author

Benedikter, J., Hümmer, T., Mader, M., Schlederer, B., Reichel, J., Hänsch, T. W., and Hunger, D.

Subjects
Physics, Fabry–Perot resonators, fiber cavities, diffraction, Physics::Optics, ddc:530, mode coupling
Abstract

Wereport on measurements and modeling of the mode structure of tunable Fabry–Pérot optical microcavities with imperfect mirrors.Wefind that non-spherical mirror shape and finite mirror size leave the fundamental mode mostly unaffected, but lead to loss, mode deformation, and shifted resonance frequencies at particular mirror separations. For small mirror diameters, the useful cavity length is limited to values significantly below the expected stability range.Weexplain the observations by resonant coupling between different transverse modes of the cavity and mode-dependent diffraction loss. A model based on resonant state expansion that takes into account the measured mirror profile can reproduce the measurements and identify the parameter regime where detrimental effects of mode mixing are avoided.

Published
2015
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49. Nonlinear laser spectroscopy

Author

Atkins, C. G., Hancock, G., Zacharias, H., Beverini, N., Galli, M., Inguscio, M., Strumia, F., Bionducci, G., Bloomfield, L. A., Gerhardt, H., Hänsch, T. W., Boulnois, J. L., Aubourg, P., Van Lerberghe, A., Agrawal, G. P., Boyd, R. W., Harter, D. J., Chen, H. L., Erbert, G. V., Garrett, W. R., Payne, M. G., Ferrell, W. R., Miller, John C., Compton, R. N., Greenland, P. T., Jackson, D. J., Wynne, J. J., Kes, P. H., Köster, E., Gao, Q. F., Raj, R. K., Bloch, D., Ducloy, M., Pini, R., Mazzoni, M., Salimbeni, R., Matera, M., Lin, C., Raimond, J. M., Goy, P., and Haroche, S.

Published
1982
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