Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Gu, Ming Feng"'
Autor:
Shah, Chintan, Kühn, Steffen, Bernitt, Sonja, Steinbrügge, René, Togawa, Moto, Berger, Lukas, Buck, Jens, Hoesch, Moritz, Seltmann, Jörn, Kozlov, Mikhail G., Porsev, Sergey G., Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Cheung, Charles, Safronova, Marianna S., López-Urrutia, José R. Crespo
Publikováno v:
Physical Review A 109, 063108 (2024)
We used the monochromatic soft-x-ray beamline P04 at the synchrotron-radiation facility PETRA III to resonantly excite the strongest $2p-3d$ transitions in neon-like Ni XIX ions, $[2p^6]_{J=0} \rightarrow [(2p^5)_{1/2}\,3d_{3/2}]_{J=1}$ and $[2p^6]_{
Externí odkaz:
http://arxiv.org/abs/2404.14589
Autor:
Shah, Chintan, Togawa, Moto, Botz, Marc, Danisch, Jonas, Goes, Joschka J., Bernitt, Sonja, Maxton, Marleen, Köbnick, Kai, Buck, Jen, Seltmann, Jörn, Hoesch, Moritz, Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Cheung, Charles, Safronova, Marianna S., López-Urrutia, José R. Crespo
Publikováno v:
The Astrophysical Journal, 969, 52 (2024)
We improve by a factor of 4-20 the energy accuracy of the strongest soft X-ray transitions of Fe XVII ions by resonantly exciting them in an electron beam ion trap with a monochromatic beam at the P04 beamline of the PETRA III synchrotron facility. B
Externí odkaz:
http://arxiv.org/abs/2401.08395
Autor:
Rehbehn, Nils-Holger, Rosner, Michael K., Berengut, Julian C., Schmidt, Piet O., Pfeifer, Thomas, Gu, Ming Feng, López-Urrutia, José R. Crespo
Optical frequency metrology in atoms and ions can probe hypothetical fifth-forces between electrons and neutrons by sensing minute perturbations of the electronic wave function induced by them. A generalized King plot has been proposed to distinguish
Externí odkaz:
http://arxiv.org/abs/2309.17141
Autor:
Gu, Liyi, Shah, Chintan, Mao, Junjie, Raassen, A. J. J., de Plaa, Jelle, Pinto, Ciro, Akamatsu, Hiroki, Werner, Norbert, Simionescu, Aurora, Mernier, Francois, Sawada, Makoto, Mohanty, Pranav, Amaro, Pedro, Gu, Ming Feng, Porter, F. Scott, Lopez-Urrutia, Jose R. Crespo, Kaastra, Jelle S.
Publikováno v:
A&A 664, A62 (2022)
There has been a growing request from the X-ray astronomy community for a quantitative estimate of systematic uncertainties originating from the atomic data used in plasma codes. Though there have been several studies looking into atomic data uncerta
Externí odkaz:
http://arxiv.org/abs/2206.07134
Efficient excitation of nuclei via exchange of a real or virtual photon has a fundamental importance for nuclear science and technology development. Here, we present a new mechanism of nuclear excitation based on the capture of a free muon into the a
Externí odkaz:
http://arxiv.org/abs/2202.11215
Autor:
Kühn, Steffen, Cheung, Charles, Oreshkina, Natalia S., Steinbrügge, René, Togawa, Moto, Bernitt, Sonja, Berger, Lukas, Buck, Jens, Hoesch, Moritz, Seltmann, Jörn, Trinter, Florian, Keitel, Christoph H., Kozlov, Mikhail G., Porsev, Sergey G., Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Harman, Zoltán, Safronova, Marianna S., López-Urrutia, José R. Crespo, Shah, Chintan
Publikováno v:
Physical Review Letters 129, 245001 (2022)
One of the most enduring and intensively studied problems of X-ray astronomy is the disagreement of state-of-the art theory and observations for the intensity ratio of two Fe XVII transitions of crucial value for plasma diagnostics, dubbed 3C and 3D.
Externí odkaz:
http://arxiv.org/abs/2201.09070
Autor:
Shah, Chintan, Hell, Natalie, Hubbard, Antonia, Gu, Ming Feng, MacDonald, Michael J., Eckart, Megan E., Kelley, Richard L., Kilbourne, Caroline A., Leutenegger, Maurice A., Porter, F. Scott, Brown, Gregory V.
Publikováno v:
The Astrophysical Journal, 914, 34 (2021)
We report measurements of electron-impact excitation cross sections for the strong K-shell n=2-1 transitions in S XV using the LLNL EBIT-I electron beam ion trap, two crystal spectrometers, and the EBIT Calorimeter Spectrometer. The cross sections ar
Externí odkaz:
http://arxiv.org/abs/2106.06493
Autor:
Grilo, Filipe, Shah, Chintan, K"uhn, Steffen, Steinbr"ugge, Ren'e, Fujii, Keisuke, Marques, Jos'e, Gu, Ming Feng, Santos, Jos'e Paulo, L'opez-Urrutia, Jos'e R. Crespo, Amaro, Pedro
Publikováno v:
The Astrophysical Journal, 913, 140 (2021)
We investigated experimentally and theoretically dielectronic recombination (DR) populating doubly excited configurations $3l3l'$ (LMM) in Fe XVII, the strongest channel for soft X-ray line formation in this ubiquitous species. We used two different
Externí odkaz:
http://arxiv.org/abs/2106.04746
Autor:
Zhang, Chun Yu, Wang, Kai, Si, Ran, Godefroid, Michel, Jönsson, Per, Xiao, Jun, Gu, Ming Feng, Chen, Chong Yang
Atomic properties of $n=3$ states of the W$^{56+}$ $-$ W$^{61+}$ ions are systematically investigated through two state-of-the-art methods, namely, the second-order many-body perturbation theory, and the multi-configuration Dirac-Hartree-Fock method
Externí odkaz:
http://arxiv.org/abs/2103.08891
Autor:
Rehbehn, Nils-Holger, Rosner, Michael K., Bekker, Hendrik, Berengut, Julian C., Schmidt, Piet O., King, Steven A., Micke, Peter, Gu, Ming Feng, Müller, Robert, Surzhykov, Andrey, López-Urrutia, José R. Crespo
Publikováno v:
Phys. Rev. A 103, 040801 (2021)
Promising searches for new physics beyond the current Standard Model (SM) of particle physics are feasible through isotope-shift spectroscopy, which is sensitive to a hypothetical fifth force between the neutrons of the nucleus and the electrons of t
Externí odkaz:
http://arxiv.org/abs/2102.02309