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. DederichsS. 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

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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 für Physik C Particles and Fields
Issue number3
StatePublished - Sep 1991


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