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Design and characterization of an antiproton deceleration beamline for the PUMA experiment
/ Fischer, Jonas (Darmstadt, Tech. U.) ; Schmidt, Alexander (Darmstadt, Tech. U.) ; Azaryan, Nikolay (CERN) ; Butin, François (CERN) ; Somoza, Jose Ferreira (CERN) ; Husson, Audric (Darmstadt, Tech. U.) ; Klink, Clara (CERN) ; Obertelli, Alexandre (Darmstadt, Tech. U.) ; Schlaich, Moritz (Darmstadt, Tech. U.) ; Sinturel, Alexandre (CERN) et al.
We report on the design and characterization of an antiproton deceleration beamline, based on a pulsed drift tube, for the PUMA experiment at the Antimatter Factory at CERN. The design has been tailored to high-voltage (100 kV) and ultra-high vacuum (below $10^{-10}$ mbar) conditions. [...]
arXiv:2401.11875.-
2024-03-15 - 9 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 550 (2024) 165318
Fulltext: 2401.11875 - PDF; Publication - PDF;
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Development and commissioning of ion-optical elements for ion and antiproton beams with energies up to 5 keV
/ Klink, Clara (Darmstadt, Tech. U. ; CERN) ; Schlaich, Moritz (Darmstadt, Tech. U.) ; Fischer, Jonas (Darmstadt, Tech. U.) ; Obertelli, Alexandre (Darmstadt, Tech. U.) ; Schmidt, Alexander (Darmstadt, Tech. U.) ; Wienholtz, Frank (Darmstadt, Tech. U.)
In nuclear and atomic physics experiments, charged ion beams often need to be guided from the ion production to the experimental site. In the PUMA experiment, an ion source beamline was developed, which can be operated with up to \SI5{\kilo\electronvolt} beam energy at a base pressure of $10^{-9}$ mbar or better. [...]
arXiv:2410.18724.-
2024-11-15 - 22 p.
- Published in : JINST 19 (2024) T11009
Fulltext: 2410.18724 - PDF; Publication - PDF;
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Systematic investigation of critical charge limits in Thick GEMs
/ Gasik, P. (Darmstadt, GSI ; FAIR, Darmstadt) ; Lautner, L. (CERN ; Munich, Tech. U.) ; Fabbietti, L. (Munich, Tech. U.) ; Fribert, H. (Munich, Tech. U.) ; Klemenz, T. (Munich, Tech. U.) ; Mathis, A. (Munich, Tech. U.) ; Ulukutlu, B. (Munich, Tech. U.) ; Waldmann, T. (Munich, Tech. U.)
We present discharge probability studies performed with a single Thick Gas Electron Multiplier (THGEM) irradiated with alpha particles in Ar-CO$_2$ and Ne-CO$_2$ mixtures. We observe a clear dependency of the discharge stability on the noble gas and quencher content pointing to lighter gases being more stable against the development of streamer discharges. [...]
arXiv:2204.02853.-
2023-02 - 9 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1047 (2023) 167730
Fulltext: 2204.02853 - PDF; Publication - PDF;
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Nuclear charge radius of $^{26m}$Al and its implication for V$_{ud}$ in the quark-mixing matrix
/ Plattner, P. (CERN ; Innsbruck U. ; Heidelberg, Max Planck Inst.) ; Wood, E. (Liverpool U.) ; Ayoubi, L. Al (Jyvaskyla U.) ; Beliuskina, O. (Jyvaskyla U.) ; Bissell, M.L. (Manchester U. ; CERN) ; Blaum, K. (Heidelberg, Max Planck Inst.) ; Campbell, P. (Manchester U.) ; Cheal, B. (Liverpool U.) ; de Groote, R.P. (Jyvaskyla U.) ; Devlin, C.S. (Liverpool U.) et al.
Collinear laser spectroscopy was performed on the isomer of the aluminium isotope $^{26m}$Al. The measured isotope shift to $^{27}$Al in the $3s^{2}3p\;^{2}\!P^\circ_{3/2} \rightarrow 3s^{2}4s\;^{2}\!S_{1/2}$ atomic transition enabled the first experimental determination of the nuclear charge radius of $^{26m}$Al, resulting in $R_c$=\qty{3.130±.015}{\femto\meter}. [...]
arXiv:2310.15291.-
2023-11-27 - 7 p.
- Published in : Phys. Rev. Lett. 131 (2023) 222502
Fulltext: 2310.15291 - PDF; Publication - PDF;
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KATRIN background due to surface radioimpurities
/ KATRIN Collaboration
The goal of the KArlsruhe TRItrium Neutrino (KATRIN) experiment is the determination of the effective electron antineutrino mass with a sensitivity of 0.2 eV/c$^2$ at 90% C.L. This goal can only be achieved with a very low background level in the order of 0.01 counts per second. [...]
arXiv:2011.05107.-
2022-05 - 11 p.
- Published in : Astropart. Phys. 138 (2022) 102686
Fulltext: PDF; Fulltext from publisher: PDF;
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Investigation of high resistivity p-type FZ silicon diodes after 60Co γ-irradiation
/ Liao, C. (Hamburg U.) ; Fretwurst, E. (Hamburg U.) ; Garutti, E. (Hamburg U.) ; Schwandt, J. (Hamburg U.) ; Pintilie, I. (Bucharest, IFIN-HH) ; Nitescu, A. ; Himmerlich, A. (CERN) ; Moll, M. (CERN) ; Gurimskaya, Y. (CERN) ; Li, Z. (Ludong U., Yantai)
In this work, the effects of $^\text{60}$Co $\gamma$-ray irradiation on high resistivity $p$-type diodes have been investigated. The diodes were exposed to dose values of 0.1, 0.2, 1, and \SI2{\mega Gy}. [...]
arXiv:2306.15336.-
2024-01-13 - 13 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1061 (2024) 169103
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$(J/\psi, J/\psi)$, and $(\eta_c, \eta_c)$ production through two intermediate photons in electron-positron annihilation at B-factories
/ Bhatnagar, Shashank (Delhi U.) ; Negash, Hluf (Samara U.)
We study the processes, $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow J/\psi +J/\psi$, and $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow \eta_c+ \eta_c$ at $\sqrt{s}=10.6$ GeV in the framework of $4\times 4$ Bethe-Salpeter equation. For $J/\psi+J/\psi$ production, the dominant contribution is through fragmentation process, while for $\eta_c+\eta_c$ production, the quark rearrangement diagrams contribute. [...]
arXiv:2406.07508; CERN-TH-2024-081.-
2024-10-15 - 11 p.
- Published in : Nucl. Phys. A 1053 (2025) 122969
Fulltext: PDF;
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