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1.
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Limits on antiproton-nuclei annihilation cross sections at ∼125 keV
/ Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt.) ; Barna, D (Wigner RCP, Budapest ; CERN) ; Corradini, M (Brescia U. ; INFN, Pavia) ; De Salvador, D (Padua U. ; INFN, Legnaro) ; Hayano, R S (Tokyo U.) ; Hori, M (Munich, Max Planck Inst. Quantenopt.) ; Leali, M (Brescia U. ; INFN, Pavia) ; Lodi-Rizzini, E (Brescia U. ; INFN, Pavia) ; Mascagna, V (Brescia U. ; INFN, Pavia ; Insubria U., Como) ; Prest, M (Insubria U., Como ; INFN, Milan Bicocca) et al.
Some experimental limits on the annihilation cross sections $σ_{\textrm{ann}}$ of antiprotons on carbon, palladium, and platinum targets were determined at the previously unexplored kinetic energy region E≈125 keV. Information on $σ_{\textrm{ann}}$ at such low antiproton energies is important in understanding the dynamics of the annihilation process, and provides useful data for models that attempt to describe the matter-antimatter asymmetry in the universe by assuming the existence of islands of antimatter concentration..
2021 - 17 p.
- Published in : Nucl. Phys. A 1009 (2021) 122170
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2.
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Measurement of the antiproton–nucleus annihilation cross-section at low energy
/ Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt.) ; Bianconi, A (U. Brescia ; INFN, Pavia) ; Corradini, M (U. Brescia ; INFN, Pavia) ; Hayano, R (Tokyo U.) ; Hori, M (Munich, Max Planck Inst. Quantenopt. ; Tokyo U.) ; Leali, M (U. Brescia ; INFN, Pavia) ; Lodi Rizzini, E (U. Brescia ; INFN, Pavia) ; Mascagna, V (U. Brescia ; INFN, Pavia) ; Murakami, Y (Tokyo U.) ; Prest, M (INFN, Milan Bicocca ; Insubria U., Como) et al.
Systematic measurements of the annihilation cross sections of low energy antinucleons were performed at CERN in the 80's and 90's. However the antiproton data on medium-heavy and heavy nuclear targets are scarce. [...]
2018 - 13 p.
- Published in : Nucl. Phys. A 970 (2018) 366-378
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3.
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Coupled channel analysis of $\pi^+ \pi^ -\pi^0$, $K^+ K^- \pi^0$ and $K^{\pm} K^0_S \pi^{\mp}$ from $\bar p p$ annihilation at rest in hydrogen targets at three densities
/ Bargiotti, M (Bologna U. ; INFN, Bologna) ; Bertin, A (Bologna U. ; INFN, Bologna) ; Bruschi, M (Bologna U. ; INFN, Bologna) ; Capponi, M (Bologna U. ; INFN, Bologna) ; De Castro, S (Bologna U. ; INFN, Bologna) ; Fabbri, L (Bologna U. ; INFN, Bologna) ; Faccioli, P (Bologna U. ; INFN, Bologna) ; Galli, D (Bologna U. ; INFN, Bologna) ; Giacobbe, B (Bologna U. ; INFN, Bologna) ; Marconi, U (Bologna U. ; INFN, Bologna) et al.
/OBELIX
The $\pi^+ \pi^ -\pi^0$, $K^+ K^- \pi^0$ and $K^\pm K^0 \pi^\mp$ final states produced by $\bar p p$ annihilation at rest at three different hydrogen target densities have been analyzed in the frame of a coupled channel analysis together with $\pi \pi$, $\pi K$ and $K \bar K$ scattering data. The percentages of the different partial waves, the branching ratios and the parameters (masses, widths, $\pi \pi$ and $K \bar K$ partial widths) of all the involved resonances ($J^P = 0^+, 1^-, 2^+$) have been measured. [...]
2002 - 18 p.
- Published in : Eur. Phys. J. C 26 (2003) 371-388
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4.
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Experimental Apparatus for Antiproton-Nucleus Annihilation Cross Section Measurements at Low Energy
/ Aghai-Kozani, H (Munich, Max Planck Inst. Quantenopt.) ; Corradini, M (INFN, Pavia ; Pavia U.) ; Hayano, R (Tokyo U.) ; Hori, M (Munich, Max Planck Inst. Quantenopt.) ; Leali, M (INFN, Pavia ; Pavia U.) ; Lodi-Rizzini, E (INFN, Pavia ; Pavia U.) ; Mascagna, V (INFN, Pavia ; Pavia U.) ; Murakami, Y (Tokyo U.) ; Prest, M (INFN, Milan Bicocca ; Insubria U., Como) ; Solazzi, L (INFN, Pavia ; Pavia U.) et al.
The antiproton annihilation cross section at 5.3 MeV of kinetic energy on different nuclei (Ni, Sn, Pt) has been recently measured by the ASACUSA Collaboration at the CERN Antiproton Decelerator. A new experiment with a different apparatus has been performed on a carbon target in order to get a more precise measurement for a stringent comparison with the antineutron data. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011037
External link: Fulltext
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011037
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5.
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Recent Results on the Antiproton-Nucleus Annihilation Cross Section at Low Energy
/ Aghai-Khozani, H ; Corradini, M ; Hayano, R ; Hori, M ; Leali, M ; Lodi-Rizzini, E ; Mascagna, V ; Murakami, Y ; Prest, M ; Vallazza, E et al.
Measurements of the antinucleon-nuclei annihilation cross section (σ_ann) at very low energies have been performed at CERN during the 80’s and 90’s with the LEAR facility and more recently with the Antiproton Decelerator. One of the unexplained results is the behaviour of the antineutron data on several nuclei (C, Al, Cu, Ag, Sn, Pb) at momenta below 180 MeV/c [1], where the σ_ann values, as a function of energy, have a steep rise typical of low-energy charged projectiles [2]. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011036
External link: Fulltext
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011036
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6.
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Progress of antihydrogen beam production using a double cusp trap
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (U. Tokyo (main)) ; Dupre, P (Wako, RIKEN) ; Radics, B (Wako, RIKEN) ; Tajima, M (U. Tokyo (main) ; Wako, RIKEN) ; Capon, A A (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Kaga, C (ADSM, Hiroshima) ; Kolbinger, B (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M (INFN, Brescia ; Brescia U.) et al.
We report the progress of the $\bar{\text{H}}$ beam production experiment and recent developments of the double cusp trap to improve of the beam intensity of the $\bar{\text{H}}$ atomic beams, the ASACUSA Micromegas tracker to monitoring the antihydrogen synthesis and the antihydrogen beam detector..
2017 - 10 p.
- Published in : JPS Conf. Proc. 18 (2017) 011007
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011007
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7.
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The development of the antihydrogen beam detector: Toward the three dimensional tracking with a BGO crystal and a hodoscope
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (Tokyo, U. Earth Sci. Astron.) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Kolbinger, B (Stefan Meyer Inst. Subatomare Phys.) ; Malbrunot, C (CERN ; Stefan Meyer Inst. Subatomare Phys.) ; Capon, A A (Stefan Meyer Inst. Subatomare Phys.) ; Dupre, P (Wako, RIKEN) ; Radics, B (Wako, RIKEN) ; Tajima, M (Tokyo, U. Earth Sci. Astron. ; Wako, RIKEN) ; Kaga, C (ADSM, Hiroshima) et al.
We developed an antihydrogen beam detector for the microwave spectroscopy of the antihydrogen hyperfine splitting. The detector consists of a position sensitive BGO calorimeter and a hodoscope. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011038
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011038
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8.
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Measurements and 3D reconstruction of antimatter annihilations with the ASACUSA Micromegas Tracker
/ Radics, B (RIKEN (main) ; Zurich, ETH) ; Breuker, H (CERN) ; Dupre, P (RIKEN (main)) ; Higashi, Y (U. Tokyo (main)) ; Kaga, C (ADSM, Hiroshima) ; Leali, M (INFN, Brescia ; Brescia U.) ; Lodi Rizzini, E (INFN, Brescia ; Brescia U.) ; Mascagna, V (INFN, Brescia ; Brescia U.) ; Matsudate, T (U. Tokyo (main)) ; Murtagh, D J (RIKEN (main)) et al.
The aim of the ASACUSA-CUSP experiment is to form a beam of antihydrogen atoms for in-flight precision spectroscopic measurements. This is performed by trapping and mixing antiprotons and positrons in a common nested-well potential, which is sitting in a double-cusp magnetic field with minimum-B field configuration. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011010
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011010
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9.
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Direct detection of antihydrogen atoms using a BGO crystal
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (Tokyo U., Komaba ; Wako, RIKEN) ; Ohtsuka, M (Tokyo U., Komaba) ; Leali, M (Brescia U. ; INFN, Brescia) ; Lodi-Rizzini, E (Brescia U. ; INFN, Brescia) ; Mascagna, V (Brescia U. ; INFN, Brescia) ; Tajima, M (Tokyo U., Komaba ; Wako, RIKEN) ; Torii, H A (Tokyo U., Komaba ; Wako, RIKEN) ; Zurlo, N (Brescia U. ; INFN, Brescia) ; Matsuda, Y (Tokyo U., Komaba ; Wako, RIKEN) et al.
The ASACUSA collaboration has developed a detector consisting of a large size BGO crystal to detect an atomic antihydrogen beam, and performed the direct detection of antihydrogen atoms. Energy spectra from antihydrogen annihilation on the BGO crystal are discussed in comparison to simulation results from the GEANT4 toolkit. [...]
2016 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 840 (2016) 153-159
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10.
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Towards Measuring the Ground State Hyperfine Splitting of Antihydrogen -- A Progress Report
/ Sauerzopf, C. (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A.A. (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M. (Stefan Meyer Inst. Subatomare Phys.) ; Dupré, P. (Wako, RIKEN) ; Higashi, Y. (Tokyo U., Komaba) ; Kaga, C. (ADSM, Hiroshima) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M. (Brescia U. ; INFN, Pavia) ; Lehner, S. (Stefan Meyer Inst. Subatomare Phys.) ; Lodi Rizzini, E. (Brescia U. ; INFN, Pavia) et al.
We report the successful commissioning and testing of a dedicated field-ioniser chamber for measuring principal quantum number distributions in antihydrogen as part of the ASACUSA hyperfine spectroscopy apparatus. The new chamber is combined with a beam normalisation detector that consists of plastic scintillators and a retractable passivated implanted planar silicon (PIPS) detector..
arXiv:1606.01791.-
2016-06-20 - 5 p.
- Published in : Hyperfine Interact. 237 (2016) 103
Fulltext: PDF; External link: Preprint
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.103
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