Electromagnetic dissociation of relativistic sup 28 Si into p + sup 27 Al

Journal Article · Fri May 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.2427· OSTI ID:7113806

Barrette, J; Bellwied, R; Braun-Munzinger, P; Cleland, W E; David, G; Dee, J; Dietzsch, O; Duek, E; Fatyga, M; Fox, D; Greene, S V; Hall, J R; Hemmick, T K; Herrmann, N; Hogue, R W; Hong, B; Jayananda, K; Kraus, D; Shiva Kumar, B; Lacasse, R ; Lissauer, D; Llope, W J; Ludlam, T; Majka, R; Makowiecki, D; Mark, S K; McCorkle, S; Mitchell, J T; Muthuswamy, M; O'Brien, E; Polychronakos, V; Pruneau, C; Rotondo, F S; Sandweiss, J; Simon-Gillo, J; Sonnadara, U; Stachel, J; Takai, H; Takagui, E M; Throwe, T G; Waters, L; Willis, W J; Winter, C; Wolf, K; Wolfe, D; Woody, C L; Xu, N; Zhang, Y; Zhang, Z; Zou, Z ^[1]

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States) European Organization for Nuclear Research (CERN), Geneva (Switzerland) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) McGill University, Montreal, Quebec, H3A 2K6 (Canada) University of New Mexico, Albuquerque, New Mexico 87131 (United Stat

We report a direct measurement of the final-state energy spectrum in the electromagnetic dissociation of {sup 28}Si into {ital p}+ {sup 27}Al at an energy of 14.6 GeV/nucleon. The final-state energy is obtained through a calculation of the {ital p}-{sup 27}Al invariant mass in kinematically reconstructed events. The final-state energy spectrum for all targets is peaked near the isovector giant-dipole resonance in {sup 28}Si and the dependence of the magnitude of the cross section on target charge confirms that the excitation is largely electromagnetic. By exploiting the expected scaling behavior on target {ital Z} and {ital A}, the background from nuclear interactions is evaluated and subtracted, leaving a pure electromagnetic dissociation final-state energy distribution. This distribution is well reproduced by simulated events, in which the photon spectrum calculated in the Weiszaecker-Williams approximation is combined with experimental data on the photonuclear reaction {sup 28}Si({gamma},{ital p}) {sup 27}Al, and slight differences are observed only at low final-state energy.

• OSTI ID: 7113806
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663530 -- Nuclear Mass Ranges-- A=20-38-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DISSOCIATION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
FERMIONS
GIANT RESONANCE
HADRONS
HEAVY ION REACTIONS
INFORMATION
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PROTONS
RELATIVISTIC RANGE
RESONANCE
SILICON 28 REACTIONS
SPECTRA
TOTAL CROSS SECTIONS