Exclusive studies of angular distributions in GeV hadron-induced reactions with 197Au

W.-c. Hsi, K. Kwiatkowski, G. Wang, D. S. Bracken, E. Cornell, D. S. Ginger, V. E. Viola, R. G. Korteling, K. B. Morley, R. Huang, W. G. Lynch, M. B. Tsang, H. Xi, F. Gimeno-Nogues, E. Ramakrishnan, D. Rowland, S. J. Yennello, H. Breuer, S. Gushue, L. P. Remsberg, A. Botvina, and W. A. Friedman
Phys. Rev. C 60, 034609 – Published 11 August 1999
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Abstract

Exclusive studies of angular distributions for intermediate-mass fragments (IMFs) produced in GeV hadron-induced reactions have been performed with the Indiana Silicon Sphere (ISiS) 4π detector array. Special emphasis has been given to understanding the origin of sideways peaking, which becomes prominent in the angular distributions for beam momenta above about 10GeV/c. Both the magnitude of the effect and the peak angle increase as a function of fragment multiplicity and charge. When gated on IMF kinetic energy, the angular distributions evolve from forward-peaked to near isotropy as the fragment kinetic energy decreases. Fragment-fragment angular-correlation analyses show no obvious evidence for a dynamic mechanism that might signal shock wave effects or the breakup of exotic geometric shapes such as bubbles or toroids. Moving-source and intranuclear cascade simulations suggest that the observed sideways peaking is of kinematic origin, arising from significant transverse momentum imparted to the heavy recoil nucleus during the fast cascade stage of the collision. A two-step cascade and statistical multifragmentation calculation is consistent with this assumption.

  • Received 28 April 1999

DOI:https://doi.org/10.1103/PhysRevC.60.034609

©1999 American Physical Society

Authors & Affiliations

W.-c. Hsi, K. Kwiatkowski*, G. Wang, D. S. Bracken*, E. Cornell, D. S. Ginger§, and V. E. Viola

  • Departments of Chemistry, Physics and IUCF, Indiana University, Bloomington, Indiana 47405

R. G. Korteling

  • Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A I56

K. B. Morley

  • Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

R. Huang, W. G. Lynch, M. B. Tsang, and H. Xi

  • Department of Physics and NSCL, Michigan State University, East Lansing, Michigan 48824

F. Gimeno-Nogues, E. Ramakrishnan, D. Rowland, and S. J. Yennello

  • Department of Chemistry and Cyclotron Institute, Texas A & M University, College Station, Texas 77843

H. Breuer

  • Department of Physics, University of Maryland, College Park, Maryland 20740

S. Gushue and L. P. Remsberg

  • Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973

A. Botvina

  • Department of Physics, University of Bologna, Bologna I-40126, Italy

W. A. Friedman

  • Department of Physics, University of Wisconsin, Madison, Wisconsin 53706

  • *Present address: Los Alamos National Lab, Los Alamos, NM 87545.
  • Present address: Epsilon, Inc., Dallas, TX 75240.
  • Present address: Lawrence Berkeley Laboratory, Berkeley, CA 94720.
  • §Present address: Department of Physics, Cambridge University, Cambridge, United Kingdom.
  • On leave from Institute for Nuclear Research, RU-117312 Moscow, Russia.

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Vol. 60, Iss. 3 — September 1999

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