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Diffraction dissociation of nuclei in 450 GeV/c proton-nucleus collisions

  • T. Åkesson
  • , S. Almehed
  • , A. L.S. Angelis
  • , H. Atherton
  • , P. Aubry
  • , H. W. Bartels
  • , G. Beaudoin
  • , J. M. Beaulieu
  • , H. Beker
  • , O. Benary
  • , D. Bettoni
  • , V. Bisi
  • , I. Blevis
  • , H. Bøggild
  • , W. Cleland
  • , M. Clemen
  • , B. Collick
  • , F. Corriveau
  • , S. Dagan
  • , K. Dederichs
  • S. Dell'Uomo, P. Depommier, R. C.E. Devenish, N. DiGiacomo, S. DiLiberto, J. R. Dodd, B. Dolgoshein, A. Drees, H. En'yo, B. Erlandsson, M. J. Esten, C. W. Fabjan, M. A. Faessler, P. Fischer, Z. Fraenkel, A. Gaidot, F. Gibrat-Debu, P. Giubellino, P. Glässel, U. Goerlach, R. Haglund, L. A. Hamel, H. van Hecke, V. Hedberg, R. Heifetz, A. Hölscher, B. Jacak, G. Jarlskog, S. Johanson, H. Kraner, V. Kroh, F. Lamarche, C. Leroy, D. Lisauer, G. London, B. Lorstad, A. Lounis, F. Martelli, A. marzari-Chiesa, M. Masera, M. A. Mazzoni, E. Mazzucato, N. A. McCubbin, P. McGaughey, F. Meddi, U. Mjornmark, M. T. Muciaccia, S. Muraviev, M. Murray, M. Neubert, S. Nilsson, L. Olsen, Y. Oren, J. P. Pansart, Y. M. Park, A. Pfeiffer, F. Piuz, V. Polychronakos, G. Poulard, M. Price, D. Rahm, L. Ramello, L. Riccati, G. Romano, G. Rosa, L. Sandor, J. Schukraft, M. Sekimoto, M. Seman, A. Shmeleva, V. Sidorov, S. Simone, Y. Sirois, H. Sletten, S. Smirnov, W. Sondheim, H. J. Specht, I. Stumer, J. W. Sunier, V. Tcherniatin, H. H. Thodberg, J. Thompson, V. Tikhomirov, I. Tserruya, G. Vasseur, R. Veenhof, R. Wigmans, W. J. Willis, P. Yepes
  • European Organization for Nuclear Research
  • Lund University
  • University College London
  • Universite de Montreal
  • University of Heidelberg
  • Tel Aviv University
  • University of Turin
  • Weizmann Institute of Science Israel
  • University of Pittsburgh
  • McGill University
  • University of Rome
  • MST-8, Los Alamos National Laboratory
  • National Research Nuclear University MEPhI
  • Stockholm University
  • Institut Pierre Simon Laplace, CNRS and CEA
  • Brookhaven National Laboratory
  • CCLRC Rutherford Appleton Laboratory
  • Università degli studi di Bari Aldo Moro
  • P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • University of Salerno
  • Budker Institute of Nuclear Physics of the Siberian Branch of the RAS

Research output: Contribution to journalArticlepeer-review

Abstract

Diffractive dissociation of nuclei (Be, Al, W) in collisions with 450 GeV/c protons, pA→pX, has been measured with the HELIOS spectrometer at the CERN Super Proton synchrotron. The dependence of the single-diffraction cross-section on the nuclear mass A can be parametrized as σSD mb×A0.35±0.02, showing the peripheral nature of the process. The differential cross-section dσSD=(3.8±0.3)mb ×A0.35±0.02, is exponential with the slope parameter, increasing from 6.2±0.4 (GeV/c)-2 for beryllium to 7.9±0.5 (GeV/c)-2 for tungsten. The slope parameter also increases with increasing mass MX of the diffractively produced state. The rapidity, multiplicity, and transverse-momentum distributions of the particles of the diffractively produced state X show a longitudinal phase-space population and are remarkably insensitive to the nuclear mass. This, together with the A1/3 dependence of σSD, suggests that the dominant process of nuclear diffractive excitation is the dissociation of single nucleons.

Original languageEnglish
Pages (from-to)355-366
Number of pages12
JournalZeitschrift fur Physik C-Particles and Fields
Volume49
Issue number3
DOIs
Publication statusPublished - 1 Jan 1991
Externally publishedYes

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