Sideways-peaked angular distributions in hadron-induced multifragmentation: Shock waves, geometry, or kinematics?

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.58.R13· OSTI ID:638832

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

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1. Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405 (United States)
2. Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (CANADA)
3. Department of Chemistry and Cyclotron Institute, Texas AM University, College Station, Texas 77843 (United States)
4. Department of Physics and NSCL, Michigan State University, East Lansing, Michigan 44824 (United States)
5. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
6. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
7. Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
8. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
9. 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, Journal Name: Physical Review, C Journal Issue: 1 Vol. 58; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
CORRELATIONS
GEOMETRY
HADRON REACTIONS
KINETIC ENERGY
MASS
NUCLEAR FRAGMENTATION
NUCLEAR MATTER
SHOCK WAVES
SIMULATION
TRANSVERSE MOMENTUM