Sideways-peaked angular distributions in hadron-induced multifragmentation: Shock waves, geometry, or kinematics?
- Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405 (United States)
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (CANADA)
- Department of Chemistry and Cyclotron Institute, Texas AM University, College Station, Texas 77843 (United States)
- Department of Physics and NSCL, Michigan State University, East Lansing, Michigan 44824 (United States)
- Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
- Department of Physics, Bologna University, Bologna 40126 (Italy)
Exclusive studies of sideways-peaked angular distributions for intermediate-mass fragments (IMFs) produced in hadron-induced reactions have been performed with the Indiana silicon sphere (ISiS) detector array. The effect becomes prominent for beam momenta above about 10thinspGeV/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 nearly isotropic as the fragment energy decreases. Fragment-fragment correlation studies show no evidence for a preferred angle that might signal a fast dynamic breakup mechanism. Moving-source and intranuclear cascade simulations suggest a possible kinematic origin arising from significant transverse momentum imparted to the recoil nucleus during the fast cascade. A two-step cascade and statistical multifragmentation calculation is consistent with the data. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 638832
- Journal Information:
- Physical Review, C, Vol. 58, Issue 1; Other Information: PBD: Jul 1998
- Country of Publication:
- United States
- Language:
- English
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