Antihydrogen annihilation reconstruction with the ALPHA silicon detector

G. B. Andresen, M. D. Ashkezari, W. Bertsche, P. D. Bowe, E. Butler, C. L. Cesar, S. Chapman, M. Charlton, A. Deller, S. Eriksson, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, A. Gutierrez, J. S. Hangst, W. N. Hardy, M. E. Hayden, R. S. Hayano, A. J. HumphriesR. Hydomako, S. Jonsell, L. V. Jorgensen, L. Kurchaninov, N. Madsen, S. Menary, P. Nolan, K. Olchanski, A. Olin, A. Povilus, P. Pusa, E. Sarid, S. Seif El Nasr, D. M. Silveira, C. So, J. W. Storey, R. I. Thompson, D. P. Van Der Werf, Y. Yamazaki

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


The ALPHA experiment has succeeded in trapping antihydrogen, a major milestone on the road to spectroscopic comparisons of antihydrogen with hydrogen. An annihilation vertex detector, which determines the time and position of antiproton annihilations, has been central to this achievement. This detector, an array of double-sided silicon microstrip detector modules arranged in three concentric cylindrical tiers, is sensitive to the passage of charged particles resulting from antiproton annihilation. This article describes the method used to reconstruct the annihilation location and to distinguish the annihilation signal from the cosmic ray background. Recent experimental results using this detector are outlined.

Original languageEnglish
Pages (from-to)73-81
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - 21 Aug 2012
Externally publishedYes


  • Antihydrogen
  • Antimatter
  • Cosmic ray background suppression
  • Event reconstruction
  • Vertexing detector

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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