|
1.
|
Measured Properties of an Antihydrogen Beam
/ Hunter, E. D. ; Bumbar, M. ; Amsler, C. ; Bayo, M. N. ; Breuker, H. ; Cerwenka, M. ; Costantini, G. ; Ferragut, R. ; Giammarchi, M. ; Gligorova, A. et al.
/Asacusa AD-3
We report a factor of 100 increase in the antihydrogen beam intensity downstream of ASACUSA’s Cusp trap: 320 atoms detected per 15-minute run. The beam contains many Rydberg atoms, which we selectively ionize to determine their velocity and binding energy. [...]
CERN-EP-2025-195.-
Geneva : CERN, 2025 - 19.
Draft (restricted): PDF; Fulltext: PDF; External link: Additional Information
|
|
|
2.
|
Towards Lamb shift spectroscopy of antihydrogen atoms at the GBAR $\overline H$ beam line
/ Tanaka, T A (Tokyo U., Komaba) ; Blumer, P (Zurich, ETH) ; Janka, G (PSI, Villigen) ; Ohayon, B (Technion) ; Regenfus, C (Zurich, ETH) ; Crivelli, P (Zurich, ETH) ; Kuroda, N (Tokyo U., Komaba) ; Tsukida, R (Tokyo U., Komaba) ; Higuchi, T (Kyoto U., KURRI) ; Tanaka, K S (Waseda U., RISE)
/GBAR Collaboration
A microwave (MW) spectroscopy experiment has been proposed to directly measure the resonant frequency of $2S_{1/2}-2P_{1/2}$ Lamb shift transition in antihydrogen ($\mathrm{\bar{H}}$) atoms. The spectroscopy opens up the possibility of deriving the charge radius of antiproton ($\mathrm{\bar{p}}$) using a beam of $\mathrm{\bar{H}}$ atoms with a kinetic energy of a few keV travelling under a magnetic field-free environment.The requisite spectroscopy apparatuses have been developed and installed in the $\mathrm{\bar{H}}$ beam line at the GBAR experiment, where the production of $\mathrm{\bar{H}}$ beam at 6.1 keV was demonstrated through a charge exchange reaction of a $\mathrm{\bar{p}}$ beam passing through a positronium (Ps) cloud.The spectroscopy setup is composed of a MW spectrometer and a Lyman-$\alpha$ photon detector.The MW spectrometer consists of two consecutive MW apparatuses which have a relatively large borehole of 30 mm diameter, and each MW apparatus comprises a pair of parallel plate electrodes as its inner conductor and a rectangular box as its outer conductor.Downstream to the MW spectrometer, the Lyman-$\alpha$ detector has been installed to count the $\mathrm{\bar{H}}$ atoms remaining in the $2S$ state after interacting with the MW E-field.Towards the $\mathrm{\bar{H}}$ Lamb shift spectroscopy, we present here a characterization of the MW spectrometer, an evaluation of the detection efficiency of the Lyman-$\alpha$ detector, and a precision expected in the first line shape measurement of the $\mathrm{\bar{H}}$ Lamb shift..
2025 - 8 p.
- Published in : PoS EXA-LEAP2024 (2025) 044
Fulltext: PDF;
In : International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP 2024), Vienna, Austria, 26 - 30 Aug 2024, pp.044
|
|
|
3.
|
The scintillating bar detector of the ASACUSA experiment
/ Mascagna, V (U. Brescia ; INFN, Pavia) ; Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Bayo, Matias (Milan Polytechnic ; INFN, Milan) ; Breuker, Horst (Wako, RIKEN) ; Bumbar, Marcus (Vienna U. ; CERN ; Imperial Coll., London) ; Cerwenka, Matti (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Costantini, Giovanni (U. Brescia ; INFN, Pavia) ; Ferragut, Rafael (Milan Polytechnic ; INFN, Milan) ; Giammarchi, Marco (INFN, Milan) ; Gligorova, Angela (Wako, RIKEN) et al.
Detecting charged pions emitted from antiproton annihilation on nuclei is a well-established technique utilized to determine annihilation vertex positions, crucial for several experiments in the antimatter field. For the past decade, a detector composed of plastic scintillating bars has been integral to the ASACUSA experiment, employed in both antihydrogen formation experiments and annihilation cross-section measurements. [...]
2025 - 8 p.
- Published in : PoS EXA-LEAP2024 (2025) 077
Fulltext: PDF;
In : International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP 2024), Vienna, Austria, 26 - 30 Aug 2024, pp.077
|
|
|
4.
|
|
|
5.
|
|
|
6.
|
Injection and capture of antiprotons in a Penning–Malmberg trap using a drift tube accelerator and degrader foil
/ Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H. (Wako, RIKEN) ; Bumbar, M. (CERN) ; Chesnevskaya, S. (Stefan Meyer Inst. Subatomare Phys.) ; Costantini, G. (Brescia U. ; INFN, Pavia) ; Ferragut, R. (INFN, Milan ; Padua U. ; INFN, Padua) ; Giammarchi, M. (Padua U. ; INFN, Padua) ; Gligorova, A. (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, G. (Brescia U. ; INFN, Pavia) ; Higaki, H. (Hiroshima U.) et al.
The Antiproton Decelerator (AD) at CERN provides antiproton bunches with a kinetic energy of 5.3 MeV. The Extra-Low ENergy Antiproton ring at CERN, commissioned at the AD in 2018, now supplies a bunch of electron-cooled antiprotons at a fixed energy of 100 keV. [...]
arXiv:2403.09268.-
2024-06-12 - 22 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1065 (2024) 169529
Fulltext: PDF;
|
|
|
7.
|
Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations
/ Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, Horst (Wako, RIKEN) ; Bumbar, Marcus (CERN ; Vienna U.) ; Cerwenka, Matti (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Costantini, Giovanni (Brescia U. ; INFN, Brescia ; INFN, Pavia) ; Ferragut, Rafael (Milan Polytechnic ; INFN, Milan ; Milan U.) ; Fleck, Markus (Stefan Meyer Inst. Subatomare Phys.) ; Giammarchi, Marco (INFN, Milan ; Milan U.) ; Gligorova, Angela (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, Giulia (Brescia U. ; INFN, Brescia ; INFN, Pavia) et al.
/Asacusa AD-3
The mechanism of antiproton-nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extracted, sub-keV antiprotons from the ASACUSA apparatus at CERN to measure the charged particle multiplicities and their energy deposits from antiproton annihilations at rest on three different nuclei: carbon, molybdenum and gold. [...]
arXiv:2407.06721.-
Geneva : CERN, 2024-11-17 - 18 p.
- Published in : Eur. Phys. J. A 60 (2024) 225
Draft (restricted): PDF; Fulltext: CERN-EP-2024-182 - PDF; 2407.06721 - PDF; document - PDF;
|
|
|
8.
|
Injection and capture of antiprotons in a Penning-Malmberg trap using a drift tube accelerator and degrader foil
/ Amsler, C. ; Breuker, H. ; Bumbar, M. ; Chesnevskaya, S. ; Costantini, G. ; Ferragut, R. ; Giammarchi, M. ; Gligorova, A. ; Gosta, G. ; Higaki, H. et al.
/Asacusa AD-3
The Antiproton Decelerator (AD) at CERN provides antiproton bunches with a kinetic energy of 5.3 MeV. The Extra-Low ENergy Antiproton ring at CERN, commissioned at the AD in 2018, now supplies a bunch of electron- cooled antiprotons at a fixed energy of 100 keV. [...]
CERN-EP-2024-060.-
Geneva : CERN, 2024 - 22.
- Published in : Nucl. Instrum. Methods Phys. Res. A
Draft (restricted): PDF; Fulltext: PDF;
|
|
|
9.
|
Production of antihydrogen atoms by 6 keV antiprotons through a positronium cloud
/ Adrich, P. (NCBJ, Swierk) ; Blumer, P. (Zurich, ETH) ; Caratsch, G. (Zurich, ETH) ; Chung, M. (UNIST, Ulsan) ; Cladé, P. (Paris, Lab. Kastler Brossel) ; Comini, P. (IRFU, Saclay) ; Crivelli, P. (Zurich, ETH) ; Dalkarov, O. (Unlisted) ; Debu, P. (IRFU, Saclay) ; Douillet, A. (Paris, Lab. Kastler Brossel ; U. Evry) et al.
We report on the first production of an antihydrogen beam by charge exchange of 6.1 keV antiprotons with a cloud of positronium in the GBAR experiment at CERN. The antiproton beam was delivered by the AD/ELENA facility. [...]
arXiv:2306.15801.-
2023-11-06 - 18 p.
- Published in : Eur. Phys. J. C
Fulltext: 2306.15801 - PDF; Publication - PDF; Erratum - PDF;
|
|
|
10.
|
|
|
Upgrade of the positron system of the ASACUSA-Cusp experiment
/ Lanz, A. (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H. (Wako, RIKEN) ; Bumbar, M. (Stefan Meyer Inst. Subatomare Phys.) ; Chesnevskaya, S. (Stefan Meyer Inst. Subatomare Phys.) ; Costantini, G. (Brescia U. ; INFN, Pavia) ; Ferragut, R. (Milan, Polytech.) ; Giammarchi, M. (INFN, Milan) ; Gligorova, A. (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, G. (Brescia U. ; INFN, Pavia) et al.
The ASACUSA-Cusp collaboration has recently upgraded the positron system to improve the production of antihydrogen. [...]
arXiv:2307.06133.
-
10.
Fulltext
|
|
email alert
or subscribe to the 
RSS feed.