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The mechanically induced structural disorder in barium hexaferrite, BaFe12O19, and its impact on magnetism
/ Šepelák, V (KIT, Karlsruhe ; Leibniz U., Hannover) ; Myndyk, M (TU, Dresden (main)) ; Witte, R (KIT, Karlsruhe) ; Röder, J (CERN) ; Menzel, D (Braunschweig Tech. U.) ; Schuster, R H (Leibniz U., Hannover) ; Hahn, H (KIT, Karlsruhe) ; Heitjans, P (Leibniz U., Hannover) ; Becker, K-D (Leibniz U., Hannover ; Braunschweig Tech. U.)
The response of the structure of the M-type barium hexaferrite (BaFe12O19) to mechanical action through high-energy milling and its impact on the magnetic behaviour of the ferrite are investigated. Due to the ability of the Fe-57 Mossbauer spectroscopic technique to probe the environment of the Fe nuclei, a valuable insight on a local atomic scale into the mechanically induced changes in the hexagonal structure of the material is obtained. [...]
2014 - 5 p.
- Published in : Faraday Discuss. 170 (2014) 121-135
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2.
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Resonant X-Ray Magnetic Scattering Study of $BaFe_{12}O_{19}$ and $BaTiCoFe_{10}O_{19}$
/ Ohsawa, Seiji ; Okube, Maki ; Aki, Takahiro ; Sakurai, Shoichi ; Shimizu, Norio ; Ohkubo, Koichi ; Toyoda, Takeshi ; Mori, Takeharu ; Sasaki, Satoshi
2007
- Published in : AIP Conf. Proc.: 879 (2007) , pp. 1715-1722
External link: Published version from AIP
In : 9th International Conference On Synchrotron Radiation Instrumentation, Daegu, Korea, 28 May - 2 Jun 2006, pp.1715-1722
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3.
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Classifying the CP properties of the ggH coupling in H+2j production
/ Bahl, Henning (Chicago U. ; Chicago U., EFI) ; Fuchs, Elina (CERN ; Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Hannig, Marc (Leibniz U., Hannover) ; Menen, Marco (Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.)
The Higgs-gluon interaction is crucial for LHC phenomenology. [...]
arXiv:2309.03146.
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41 p.
Fulltext
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4.
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Cryogenic $^9$Be$^+$ Penning trap for precision measurements with (anti-)protons
/ Niemann, Malte (Leibniz U., Hannover) ; Meiners, Teresa (Leibniz U., Hannover) ; Mielke, Johannes (Leibniz U., Hannover) ; Borchert, Matthias Joachim (Leibniz U., Hannover) ; Cornejo, Juan Manuel (Leibniz U., Hannover) ; Ulmer, Stefan (Leibniz U., Hannover) ; Ospelkaus, Christian (Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.)
Cooling and detection schemes using laser cooling and methods of quantum logic can contribute to high precision CPT symmetry tests in the baryonic sector. This work introduces an experiment to sympathetically cool protons and antiprotons using the Coulomb interaction with a $^9$Be$^+$ ion trapped in a nearby but separate potential well. [...]
arXiv:1906.09249.-
2019-12-20 - 9 p.
- Published in : Meas. Sci. Technol. 31 (2020) 035003
Fulltext: fulltext1740961 - PDF; 1906.09249 - PDF;
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5.
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Observation of viscosity transition in α-pinene secondary organic aerosol
/ Järvinen, Emma (KIT, Karlsruhe) ; Ignatius, Karoliina (TROPOS, Leibniz) ; Nichman, Leonid (Manchester U.) ; Kristensen, Thomas B (TROPOS, Leibniz) ; Fuchs, Claudia (PSI, Villigen) ; Hoyle, Christopher R (PSI, Villigen ; Davos Observ.) ; Höppel, Niko (KIT, Karlsruhe) ; Corbin, Joel C (PSI, Villigen) ; Craven, Jill (Caltech) ; Duplissy, Jonathan (Helsinki U.) et al.
Under certain conditions, secondary organic aerosol (SOA) particles can exist in the atmosphere in an amorphous solid or semi-solid state. To determine their relevance to processes such as ice nucleation or chemistry occurring within particles requires knowledge of the temperature and relative humidity (RH) range for SOA to exist in these states. [...]
2016 - 16 p.
- Published in : Atmosph. Chem. Phys. 16 (2016) 4423-4438
Fulltext: PDF;
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6.
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Measurement of Ultralow Heating Rates of a Single Antiproton in a Cryogenic Penning Trap
/ Borchert, M.J. (Wako, RIKEN ; Leibniz U., Hannover) ; Blessing, P.E. (Wako, RIKEN ; Darmstadt, GSI) ; Devlin, J.A. (Wako, RIKEN) ; Harrington, J.A. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) ; Higuchi, T. (Wako, RIKEN ; Tokyo U.) ; Morgner, J. (Wako, RIKEN ; Leibniz U., Hannover) ; Smorra, C. (Wako, RIKEN) ; Wursten, E. (Wako, RIKEN ; CERN) ; Bohman, M. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) ; Wiesinger, M. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) et al.
We report on the first detailed study of motional heating in a cryogenic Penning trap using a single antiproton. Employing the continuous Stern-Gerlach effect we observe cyclotron quantum transition rates of 6(1) quanta/h and an electric field noise spectral density below $7.5(3.4)\times 10^{-20}\,\text{V}^{2}\text{m}^{-2} \text{Hz}^{-1}$, which corresponds to a scaled noise spectral density below $8.8(4.0)\times 10^{-12}\,\text{V}^{2}\text{m}^{-2}$, results which are more than two orders of magnitude smaller than those reported by other ion trap experiments..
arXiv:1901.09860.-
2019-01-29 - 5 p.
- Published in : Phys. Rev. Lett. 122 (2019) 043201
Fulltext: PDF; Fulltext from Publisher: PDF;
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7.
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Superconducting solenoid system with adjustable shielding factor for precision measurements of the properties of the antiproton
/ Devlin, Jack A (RIKEN (main) ; CERN) ; Wursten, Elise (RIKEN (main) ; CERN) ; Harrington, James A (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Higuchi, Takashi (RIKEN (main) ; U. Tokyo (main)) ; Blessing, Pascal E (RIKEN (main) ; Darmstadt, GSI) ; Borchert, Matthias J (RIKEN (main) ; Leibniz U., Hannover) ; Erlewein, Stefan (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Hansen, Jannek J (RIKEN (main)) ; Morgner, Jonathan (RIKEN (main) ; Leibniz U., Hannover) ; Bohman, Matthew A (RIKEN (main) ; Heidelberg, Max Planck Inst.) et al.
A superconducting self-shielding three-solenoid system with an adjustable shielding factor is developed, implemented, and characterized using a single antiproton in a Penning trap. With the tuned system, we suppress external magnetic field disturbances by up to a factor of 225 ± 15, allowing antiproton-to-proton charge-to-mass ratio comparisons with fourfold reduced frequency fluctuations and antiproton magnetic moment determinations with tenfold reduced uncertainty..
2019 - 9 p.
- Published in : Phys. Rev. Applied 12 (2019) 044012
Fulltext from publisher: PDF;
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8.
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A parts-per-billion measurement of the antiproton magnetic moment
/ BASE Collaboration
Precise comparisons of the fundamental properties of matter–antimatter conjugates provide sensitive tests of charge–parity–time (CPT) invariance1, which is an important symmetry that rests on basic assumptions of the standard model of particle physics. Experiments on mesons2, leptons3, 4 and baryons5, 6 have compared different properties of matter–antimatter conjugates with fractional uncertainties at the parts-per-billion level or better. [...]
2017 - 10 p.
- Published in : Nature 550 (2017) 371-374
Fulltext: PDF; External link: SYMMETRY
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9.
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Study on the heat transfer of helium cryostats following loss of insulating vacuum
/ Weber, C (KIT, Karlsruhe ; Karlsruhe U., ITP) ; Henriques, A (CERN) ; Grohmann, S (Karlsruhe U., ITP ; Karlsruhe U.)
The dimensioning of pressure relief devices (PRD) for helium cryostats requires detailed knowledge of the pressure increase during incidents. In case of the loss of insulating vacuum (LIV), this is induced by heat input due to deposition of atmospheric air on the surface of the helium vessel. [...]
2019 - 6 p.
- Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012170
Fulltext: PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012170
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10.
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Constraining the ${\mathcal {C}}{\mathcal {P}}$ structure of Higgs-fermion couplings with a global LHC fit, the electron EDM and baryogenesis
/ Bahl, Henning (Chicago U. ; Chicago U., EFI) ; Fuchs, Elina (CERN ; Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Heinemeyer, Sven (Madrid, IFT) ; Katzy, Judith (DESY) ; Menen, Marco (Cologne U. ; Bonn U. ; Braunschweig, Phys. Tech. Bund.) ; Peters, Krisztian (DESY) ; Saimpert, Matthias (IRFU, Saclay) ; Weiglein, Georg (DESY ; Hamburg U., Inst. Exp. Phys. II)
CP violation in the Higgs couplings to fermions is an intriguing, but not yet extensively explored possibility. We use inclusive and differential LHC Higgs boson measurements to fit the CP structure of the Higgs Yukawa couplings. [...]
arXiv:2202.11753; CERN-TH-2021-231; DESY-22-033; EFI-22-1; IFT--UAM/CSIC--21-148.-
2022-07-10 - 52 p.
- Published in : Eur. Phys. J. C 82 (2022) 604
Fulltext: document - PDF; 2202.11753 - PDF;
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