Measurements of the Coulomb dissociation cross section of 156 MeV sup 6 Li projectiles at extremely low relative fragment energies of astrophysical interest

Journal Article · Fri Nov 01 00:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.2195· OSTI ID:5099320

Kiener, J; Gils, H J; Rebel, H; Zagromski, S; Gsottschneider, G; Heide, N; Jelitto, H; Wentz, J ^[1]; Baur, G ^[2]

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1. Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik, P.O.B. 3640, D-7500 Karlsruhe (Germany)
2. Forschungszentrum Juelich, Institut fuer Kernphysik, P.O.B. 1913, D-5170 Juelich (Germany)

Coulomb dissociation of light nuclear projectiles in the electric field of heavy target nuclei has been experimentally investigated as an alternative access to radiative capture cross sections at low relative energies of the fragments, which are of astrophysical interest. As a pilot experiment the breakup of 156 MeV {sup 6}Li projectiles at {sup 208}Pb with small emission angles of the {alpha} particle and deuteron fragments has been studied. Both fragments were coincidentally detected in the focal plane of a magnetic spectrograph at several reaction angles well below the grazing angle and with relative angles between the fragments of 0{degree}--2{degree}. The experimental cross sections have been analyzed on the basis of the Coulomb breakup theory. The results for the resonant breakup give evidence for the strong dominance of the Coulomb dissociation mechanism and the absence of nuclear distortions, while the cross section for the nonresonant breakup follows theoretical predictions of the astrophysical {ital S} factor and extrapolations of corresponding radiative capture reaction cross section to very low c.m. energies of the {alpha} particle and deuteron. Various implications of the approach are discussed.

• OSTI ID: 5099320
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 44:5; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
LEAD 208 TARGET
LITHIUM 6 REACTIONS
BREAKUP REACTIONS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
ASTROPHYSICS
CAPTURE
COINCIDENCE SPECTROMETRY
COULOMB EXCITATION
CROSS SECTIONS
DEUTERON REACTIONS
DEUTERONS
FRAGMENTATION
GAMMA RADIATION
ISOCHRONOUS CYCLOTRONS
MEV RANGE 100-1000
S PROCESS
ACCELERATORS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
CYCLIC ACCELERATORS
CYCLOTRONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
HEAVY ION REACTIONS
IONIZING RADIATIONS
MEV RANGE
NUCLEAR REACTIONS
RADIATIONS
STAR EVOLUTION
TARGETS
651920* - Nuclear Properties & Reactions
A=190-219
Experimental
640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources
651220 - Nuclear Properties & Reactions
A=1-5
Experimental