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

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.60.034609· OSTI ID:698867

Hsi, W; Kwiatkowski, K; Wang, G; Bracken, D S; Cornell, E; Ginger, D S; Viola, V E ^[1]; Korteling, R G ^[2]; Morley, K B ^[3]; Huang, R; Lynch, W G; Tsang, M B; Xi, H ^[4]; Gimeno-Nogues, F; Ramakrishnan, E; Rowland, D; Yennello, S J ^[5]; Breuer, H ^[6]; Gushue, S; Remsberg, L P ^[7] ; Botvina, A ^[8]; Friedman, W A ^[9]

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1. Departments of Chemistry, Physics and IUCF, Indiana University, Bloomington, Indiana 47405 (United States)
2. Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, (Canada) V5A I56
3. Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
4. Department of Physics and NSCL, Michigan State University, East Lansing, Michigan 48824 (United States)
5. Department of Chemistry and Cyclotron Institute, Texas A M University, College Station, Texas 77843 (United States)
6. Department of Physics, University of Maryland, College Park, Maryland 20740 (United States)
7. Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
8. Department of Physics, University of Bologna, Bologna I-40126 (Italy)
9. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)

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) 4{pi} 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 10 GeV/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. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 698867
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 60; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
GOLD 197 TARGET
HADRON REACTIONS
NUCLEAR FRAGMENTATION
PION MINUS REACTIONS
PROTON REACTIONS