Uranium target fragmentation by intermediate and high energy /sup 12/C and /sup 20/Ne ions

Journal Article · Fri Mar 01 00:00:00 EST 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.31.896· OSTI ID:6128346

McGaughey, P L; Loveland, W; Morrissey, D J; Aleklett, K; Seaborg, G T

Target fragment formation cross sections for nuclides with 24< or =A< or =237 have been measured for the interaction of 1.0, 3.0, 4.8, and 12.0 GeV /sup 12/C and 8.0 and 20.0 GeV /sup 20/Ne with /sup 238/U. Fragment isobaric yields were deduced from these data. The light fragment (A<60) yields increase rapidly with increasing projectile energy until 4 to 8 GeV with only smaller increases in yield with increasing projectile energy beyond this consistent with the origin of these fragments in a high deposition energy process. The yields of n-rich fragments (80< or =A< or =145) are energy independent from 1--20 GeV consistent with their origin in low energy fission of a uranium-like species. The n-deficient fragments (80< or =A< or =145) have excitation functions consistent with their origin in either a deep spallation or high energy fission process. (At a /sup 12/C projectile energy of 1.0 GeV, the n-deficient fragments appear to originate primarily from a fission rather than a spallation process.) The excitation functions of the heavy fragments with 60< or =A< or =200 are similar to those of the light fragments. No large yields of these fragments were observed for any system studied, contrary to a previous report. Both the intranuclear cascade model and the nuclear firestreak model satisfactorily predict the observed yields of fragments with A>60, indicating that the general pattern of yields of these fragments is governed by the excitation energy deposited in the nucleus during the first step of the reaction and the geometry of the collision.

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• DOE Contract Number: AC03-76SF00098; AM06-70RL02227; AT06-78ER70035
• OSTI ID: 6128346
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 31:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652025* -- Nuclear Properties &amp; Reactions
A=220 &amp; above
Experimental-- Nuclear Reactions &amp; Scattering-- (-1987)
652026 -- Nuclear Properties &amp; Reactions
A=220 &amp; above
Experimental-- Spontaneous &amp; Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ENERGY RANGE
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FISSION
FRAGMENTATION
FUNCTIONS
GEV RANGE
GEV RANGE 01-10
GEV RANGE 10-100
HEAVY ION REACTIONS
INFORMATION
MATHEMATICAL MODELS
NEON 20 REACTIONS
NUCLEAR CASCADES
NUCLEAR FIREBALL MODEL
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICAL DATA
SPALLATION
TARGETS
URANIUM 238 TARGET