Studies of intermediate-mass fragment emission in the [sup 3]He+[sup nat]Ag, [sup 197]Au reactions between 0. 48 and 3. 6 GeV

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.48.1092· OSTI ID:6243195

Yennello, S J; Kwiatkowski, K; Pollacco, E C; Volant, C; Cassagnou, Y; Dayras, R; Fields, D E; Harar, S; Hourani, E; Legrain, R; Norbeck, E; Planeta, R; Wile, J L; Yoder, N R; Viola, V E ^[1]

---

1. Indiana University, Bloomington, Indiana 47405 (United States) DAPNIA/Service de Physique Nucleaire, Centre d'Etudes Nucleaires de Saclay, F-91191, Gif-sur-Yvette (France) Grand Accelerateur National d'Ions Lourds (GANIL), Boite Postale No. 5027, boulevard Henri Becquerel, 14021 Caen Cedex (France) Institut de Physique Nucleaire Orsay, Boite Postale F-91406, Orsay (France) Iowa University, Iowa City, Iowa 52242 (United States) Jagellonian University, Krakow (Poland)

Intermediate-mass fragments formed in reactions of [sup 3]He ions with [sup nat]Ag and [sup 197]Au targets have been studied at five energies between 0.48 and 3.6 GeV. Inclusive measurements show that as the bombarding energy increases, there is a strong enhancement in fragment cross sections and a trend toward isotropic angular distributions. Between 0.90 and 1.8 GeV, a change in the emission mechanism is suggested by (1) kinetic energy spectra with high-energy tails that become distinctly flatter, (2) a broadening of the spectral Coulomb peaks toward lower energies, and (3) charge distributions that become constant, exhibiting a power-law exponent [tau][approx]2.0. Exclusive studies of the [sup 3]He+[sup nat]Ag system at 0.90 and 3.6 GeV detected multifragment events with multiplicities up to four. The probability for high-multiplicity events increases about 40-fold between 0.90 and 3.6 GeV. At both energies, the kinetic energy spectra depend on multiplicity, especially when triggering on backward-emitted fragments. For multiplicity three events, a rapidity analysis of the data at 3.6 GeV is consistent with a single, relatively low source velocity, [ital v][sub [ital S]][approx]0.4 cm/ns. The data are compared with predictions of a coplanarity-sphericity calculation, the sequential statistical decay code GEMINI, and a hybrid intranuclear cascade/percolation model.

• DOE Contract Number: FG02-88ER40404
• OSTI ID: 6243195
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663440* -- D-
T-
& He-induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CHARGED-PARTICLE REACTIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
FRAGMENTATION
GEV RANGE
GEV RANGE 01-10
GOLD 197 TARGET
HELIUM 3 REACTIONS
METALS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
PARTICLES
SILVER
TARGETS
TRANSITION ELEMENTS