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Francesco Nozzoli (Universita degli Studi di Trento and INFN-TIFPA (IT))27/08/2024, 14:00
The search for low energy anti-nuclei in cosmic rays allows a test of fundamental physics problems such as the possible presence of primordial antimatter or the nature of Dark Matter.
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The โPHeSCAMIโ (Pressurized Helium Scintillating Calorimeter for AntiMatter Identification) project is aiming to study a new signature for the identification of anti-nuclei in cosmic rays.
In particular,... -
T. A. Tanaka (Institute of Physics, The University of Tokyo)27/08/2024, 14:00
We have proposed a spectroscopic study of antihydrogen ($\mathrm{\bar{H}}$) Lamb shift using a neutral antiatomic beam at keV energies. Direct spectroscopy of the $n=2$ Lamb shift transition of $\mathrm{\bar{H}}$ atoms would enable the first measurement of the antiproton ($\bar{p}$) charge radius. Recently, the GBAR experiment demonstrated the production of 6.1 keV $\mathrm{\bar{H}}$ atoms via...
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Takashi Higuchi (KURNS, Kyoto University)27/08/2024, 14:25
The neutron-antineutron oscillation violates baryon number conservation and is of great importance in the context of testing Grand Unified Theories and understanding the origin of the baryon asymmetry in the universe [1].
Currently, the oscillation time is constrained to be $> 0.86 \times 10^8$ s for free neutrons, and $> 2.7\times 10^8$ s for bound neutrons [2,3]. In view of experiments...
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Steve Jones27/08/2024, 14:25
The gravitational and spectroscopic properties of antihydrogen are being measured with ever increasing precision. The limits for such experiments are not expected to come from the measurement resolution, but rather from hard-to-characterise systematic effects. These could be overcome by directly comparing hydrogen and antihydrogen, i.e. measuring both species in the same trap, using the same...
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Dr Kenta Itahashi (RIKEN)27/08/2024, 14:50
The latest results from the spectroscopy of deeply bound pionic Sn 121 atoms, performed at RIBF, RIKEN, are reported. The binding energies and widths of the pionic orbitals were determined, and the pion-nucleus interaction was deduced with unprecedented precision. It was found, after extensive analysis, that the chiral condensate at nuclear saturation density is reduced by a factor of 60+-3%...
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Fredrik Olof Andre Parnefjord Gustafsson (CERN)27/08/2024, 14:50
The Antimatter Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) at CERN's Antimatter Decelerator (AD) is used for the production and study of antimatter bound systems, such as antihydrogen for the gravitational influence on a horizontal beam of cold antihydrogen atoms [1]. AEGIS has achieved remarkable performance in trapping antiprotons and successfully demonstrated the pulsed...
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Antoine Camper (University of Oslo (NO))27/08/2024, 15:15
Positronium is the bound state of an electron and its antimatter counterpart, a positron. With just two times the mass of the electron and no nucleus, this exotic compound is the lightest of all known atoms with no gluon contribution to its mass. Its electronic structure resembles the one of hydrogen with a factor two lower reduced mass. Positronium is therefore a system of particular interest...
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Yoshiki Tanaka (RIKEN)27/08/2024, 15:15
The possible existence of $\eta^\prime$ meson nucleus bound states ( $\eta^\prime$-mesic nuclei) has been attracting interests both theoretically and experimentally, since in-medium properties of the $\eta^\prime$ meson are closely related to the axial $U(1)$ anomaly and the chiral symmetry in QCD. The especially large mass of the $\eta^\prime$ meson ($\sim$958 MeV/c$^2$) compared with the...
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Giovanni Malfattore (University & INFN, Bologna (IT))27/08/2024, 16:05
The formation mechanism of light (anti)nuclei in high-energy hadronic collisions remains an open question in high-energy physics. Their production mechanism is investigated by comparing experimental data with phenomenological models using statistical hadronization or a coalescence approach.
In particular, the coalescence mechanism finds an essential application in cosmic antinuclei studies...
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Jonas Ludwig Fischer (TU Darmstadt)27/08/2024, 16:05
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. A first operation achieved decelerating antiprotons from an initial energy of 100 keV down to $(3898 \pm 3)$...
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Nicolo Jacazio (Universita e INFN, Bologna (IT))27/08/2024, 16:30
The advent of the LHC as antimatter factory has enabled an unprecedented effort to measure the production of light (anti)nuclei from pp to heavy-ion collisions, providing input for a detailed study of nucleosynthesis in high-energy interactions. However, the production of these bound states is not modelled in commonly used event generators. Yet the detection of cosmic antinuclei is predicted...
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Christian Smorra (Heinrich Heine University Dusseldorf (DE))27/08/2024, 16:30
The worldโs only source of low-energy antiprotons is currently the AD/ELENA facility located at CERN. Precision measurements on single antiprotons have been conducted at this facility and provide stringent tests of fundamental interactions and their symmetries. However, magnetic field fluctuations from the facility operation limit the precision of upcoming measurements. To overcome this...
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Dr Naofumi Kuroda (University of Tokyo (JP))27/08/2024, 16:55
The ASACUSA CUSP experiment upgraded the MUSASHI antiproton trap with a drift tube accelerator to receive antiproton beams from ELENA, which replaced the Radio-Frequency Quadrupole decelerator. ELENA provides antiprotons at a fixed energy of 100 keV. The drift tube adjusted the injection energy of antiproton beams for the thin energy degrader at the entrance of the trap by 19 keV. The number...
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Moritz Schlaich (Technische Universitaet Darmstadt (DE))27/08/2024, 16:55
The decay of antiprotonic atoms may lead to the formation of hypernuclei that can be produced via strangeness exchange reactions following the antiproton-nucleon annihilation. To estimate the hypernuclei yields that can be expected by these kind of reactions, simulations were performed within the GiBUU transport framework.
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Using $^{16}$O, $^{40}$Ar, $^{84}$Kr and $^{132}$Xe as target nuclei,... -
Takuma Yamashita (Tohoku University)29/08/2024, 14:00
Antihydrogen positive ions ($\bar{\rm H}^+$) consisting of an antiproton and two positrons are utilized to produce cryogenic antihydrogen atoms. The $\bar{\rm H}^+$ can be collected with an electric field, sympathetically cooled by lasers with Be$^+$ ions, and subsequently neutralized by stripping off one of the positrons. The $\bar{\rm H}^+$ is integrated in the mixture of antihydrogen...
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Donovan Newson29/08/2024, 14:00
Spin polarized positron beams are employed in investigations of magnetic and electronic structure dynamics [1, 2] and may also be useful in the production of a positronium Bose-Einstein condensate [3]. Slow positron beams derived from radioactive sources are naturally spin polarized due to the non-conservation of parity in the beta decay process [4] although measuring the polarization can be...
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Andrea Capra (TRIUMF (CA))29/08/2024, 14:25
The recent measurement of the antihydrogen gravitational acceleration [Nature 621, 716โ722 (2023)] relies upon the detection of the annihilation of the anti-atoms that are released from their magnetic confinement and that move under the influence of gravity. The ALPHA-g magnetic trap is surrounded by a Time Projection Chamber designed to identify the annihilation products and to reconstruct...
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Maria Pasinetti (Max-Planck-Institut fรผr Kernphysik)29/08/2024, 14:25
The LSym experiment is a new cryogenic Penning trap experiment currently being designed at the Max-Planck-Institut fรผr Kernphysik of Heidelberg. The goal of LSym is to conduct a stringent CPT test by comparing the properties of matter and antimatter with unprecedented sensitivity by trapping simultaneously one electron and one positron in a Penning trap, which allows performing a...
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Prof. Eliahu Friedman (Racah Institute of Physics, Hebrew University, Jerusalem Israel)29/08/2024, 14:50
This work is a sequel to our two publications from 2023 (1,2) where
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14 experimental 1s and 1p single-particle binding energies of $\Lambda$ in
hypernuclei led to a quite well-defined optical potential for the
$\Lambda$-nucleus interaction. The potential contains a traditional
linear density term and a quadratic density term, the latter representing
$\Lambda NN$... -
Danielle Louise Hodgkinson (University of California Berkeley (US))29/08/2024, 14:50
In the era of ever-increased precision measurements of the fundamental properties of antihydrogen at the ALPHA experiment at CERN, knowledge of the antihydrogen energy distribution has become vital; for example, it provided a significant contribution to the uncertainty in the first direct measurement of the gravitational acceleration of antihydrogen [1]. Increased precision in ALPHA's...
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Daniel Miranda Silveira (Universidade Federal do Rio de Janeiro (BR))29/08/2024, 15:15
The ALPHA experiment (CERN) performs precise tests of fundamental Physics using spatially confined samples of antihydrogen atoms ($\bar{\mathrm{H}}$). For a direct $\mathrm{H} - \bar{\mathrm{H}}$ spectroscopic comparison, methods for loading atomic hydrogen into the apparatus are being considered. In this direction, we have demonstrated a novel source for low energy ions, capable of producing...
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Katharina von Schoeler29/08/2024, 15:15
Precise measurements of absolute nuclear charge radii are crucial ingredients for QED tests and are valuable benchmarks for modern nuclear structure theory [1]. Muonic atom spectroscopy is well known as an ideal method to accurately determine the root-mean-square (RMS) radii of the nuclear charge density distribution. By measurements of the 2p-1s transitions of muonic atoms, this technique has...
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Dr Yuichi Toyama (Chubu University)29/08/2024, 16:05
By using a superconducting transition-edge-sensor (TES) microcalorimeter with ultra-high resolution $\Delta E\sim5~\mathrm{eV}$ (FWHM), a spectroscopic measurement of $dd\mu^*$ was successfully performed for the first time.
The $dd\mu^*$, in which $\mu^-$ is resonantly coupled with two deuterons, is predicted by the latest few-body calculations to emit dissociative X-rays with...
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Matthias Holl (European Spallation Source ERIC)29/08/2024, 16:05
The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source (ESS) to search for baryon number violation [1]. The goal of the program is to produce new insights into the origins of baryogenesis by performing searches for neutronโantineutron oscillations, increasing the sensitivity by three orders of magnitude compared with the previously established limit from...
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Prof. Pawel Moskal (Jagiellonian University)29/08/2024, 16:30
The Jagiellonian Positron Emission Tomograph (J-PET) is the first PET scanner based on plastic scintillators [1]. It is designed to measure momentum vectors and the polarization of photons originating from the decays of positronium [2,3]. In combination with the newly invented positronium imaging method [4], J-PET enables the study of discrete symmetries in positronium without the use of...
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Makoto Fujiwara (TRIUMF (CA))29/08/2024, 16:30
Precision comparisons of atomic hydrogen and its antimatter counterpart, antihydrogen, provide stringent tests of fundamental symmetries between matter and antimatter such as CPT invariance and the Weak Equivalence Principle. The most precise measurements of atomic hydrogen properties have traditionally been performed in atomic beams. In contrast, precision measurements of antihydrogen to date...
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Michael Doser (CERN)29/08/2024, 16:55
Recent simulations of the annihilation of antiprotons on the periphery of nuclei at the end of their cascade within antiprotonic atoms have highlighted the possibility of trapping (and cooling) the resulting fully stripped (highly charged) nuclear remnants. In addition to being a novel pathway for forming and trapping (even short-lived) radio-isotopes, these open the door to employing them as...
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Lukas Affolter (ETH Zรผrich)29/08/2024, 16:55
Laser spectroscopy of muonic hydrogen (ฮผp) is an ideal platform to probe the proton structure. At the Paul Scherrer Institute, the CREMA collaboration aimsย to measure the ground-state hyperfine splitting (1SโHFS) with a relative accuracy of $10^{-6}$ to infer the proton structure contribution (two photon exchange correction) with a relative accuracy of $10^{-4}$. This opens the way for testing...
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T.B. D.29/08/2024, 17:20
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