Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations

Claude Amsler; Horst Breuker; Marcus Bumbar; Matti Cerwenka; Giovanni Costantini; Rafael Ferragut; Markus Fleck; Marco Giammarchi; Angela Gligorova; Giulia Gosta; Eric David Hunter; Carina Killian; Bernadette Kolbinger; Viktoria Kraxberger; Naofumi Kuroda; Moritz Lackner; Marco Leali; Giancarlo Maero; Valerio Mascagna; Yasuyuki Matsuda; Stefano Migliorati; Daniel James Murtagh; Amit Nanda; Lilian Nowak; Simon Rheinfrank; Massimiliano Romé; Martin C. Simon; Minori Tajima; Valerio Toso; Stefan Ulmer; Martin van Beuzekom; Luca Venturelli; Alina Weiser; Eberhard Widmann; Yasunori Yamazaki; Johann Zmeskal

arXiv · 2407.06721

Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations

View original source ↗Read source document ↗Export metadata ↓

Abstract

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 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. The results are compared with predictions from different models in the simulation tools Geant4 and FLUKA. A model that accounts for all the observed features is still missing, as well as measurements at low energies, to validate such models.

Explore related subjects

nucl-ex

Keep this discovery

BibTeX RIS

Claude Amsler, Horst Breuker, Marcus Bumbar, Matti Cerwenka, Giovanni Costantini, Rafael Ferragut, Markus Fleck, Marco Giammarchi, Angela Gligorova, Giulia Gosta, Eric David Hunter, Carina Killian, Bernadette Kolbinger, Viktoria Kraxberger, Naofumi Kuroda, Moritz Lackner, Marco Leali, Giancarlo Maero, Valerio Mascagna, Yasuyuki Matsuda, Stefano Migliorati, Daniel James Murtagh, Amit Nanda, Lilian Nowak, Simon Rheinfrank, Massimiliano Romé, Martin C. Simon, Minori Tajima, Valerio Toso, Stefan Ulmer, Martin van Beuzekom, Luca Venturelli, Alina Weiser, Eberhard Widmann, Yasunori Yamazaki, Johann Zmeskal. 2024-07-09. Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations. https://arxiv.org/abs/2407.06721

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Reinvestigation of the Yield of the Trinity Device

Previous published analyses of trinitite to determine the yield of the Trinity nuclear explosion used various estimates of the fraction of fission products that became incorporated in trinitite. Furthermore, these studies utilized nuclear data that has subsequently been revised. Utilizing a planar germanium detector, we observed gamma rays produced by the decays of both 137Cs and 239Pu from four samples of trinitite. From the observed 137Cs/239Pu ratios of and a simple analysis method based on current nuclear data and weapons debris studies, we find an average yield of 9.1+-4.5 kilotons from our four samples. While this result is substantially lower than the established total yield of 21 kilotons, it is in reasonable agreement that attributable to fissions in the 239Pu core alone.

nucl-ex↗

arXiv2026

Search for neutrinoless quadruple beta decay of $^{136}$Xe in PandaX-4T detector

The observation of neutrinoless quadruple beta decay (0$\nu$4$\beta$) in the absence of neutrinoless double beta decay (0$\nu$2$\beta$) has been argued to provide a strong indication that neutrinos are Dirac particles. We report a search for 0$\nu$4$\beta$ decay of $^{136}\text{Xe}$ using a total $^{136}\text{Xe}$ exposure of 148.4 kg$\cdot$yr, collected during the commissioning and the first science runs of the PandaX-4T experiment. No significant excess of events over the background is observed. A lower limit on the 0$\nu$4$\beta$ decay half-life of $^{136}\text{Xe}$ is set at 6.01 x $10^{24}$ yr at the 90% confidence level. This result establishes the most stringent constraint on this process in xenon, demonstrating the unique capability of the PandaX-4T detector in probing lepton number violation and shedding light on the fundamental nature of neutrinos.

nucl-ex↗

arXiv2026

Island of Inversion in neutron-rich cobalt isotopes revealed from mass measurements

Mass measurements of the ground and isomeric states of $^{68-70}$Co have been performed using the JYFLTRAP Penning-trap mass spectrometer at the IGISOL facility. The masses were measured, either for the first time for the isomeric states of $^{68}$Co and $^{70}$Co, or with greatly improved precision for the others, removing ambiguities in the mass surface beyond $N=40$. The ordering of the low and high-spin states in $^{68}$Co and $^{70}$Co has also been established. The results, supported by Large-Scale Shell Model and Discrete Non-Orthogonal Shell-Model calculations, show a gradual lowering of intruder states with increasing neutron number, eventually leading to an inversion in $^{70}$Co. These findings clarify previously proposed contradictory interpretations. Finally, we demonstrate the importance of including induced effective 3N forces for a consistent description of binding energies in the island of inversion near $N=40$.

nucl-ex↗