Projectile energy and atomic number dependence of electron capture from pair production in relativistic heavy ion collisions

Journal Article · Sun Oct 30 23:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.2432· OSTI ID:6947449

Belkacem, A; Gould, H ^[1]; Feinberg, B ^[2]; Bossingham, R ^[3]; Meyerhof, W E ^[4]

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1. Chemical Sciences Division, Building 71-259, Lawrence Berkeley Laboratory, One Cyclotron Road, Berkeley, California 94720 (United States)
2. Accelerator and Fusion Research Division, Building 80-101, Lawrence Berkeley Laboratory, One Cyclotron Road, Berkeley, California 94720 (United States)
3. Nuclear Science Division, Building 50-326, Lawrence Berkeley Laboratory, One Cyclotron Road, Berkeley, California 94720 (United States)
4. Department of Physics, Stanford University, Stanford, California 94305 (United States)

We report the first measurement of the energy dependence of electron capture from electron-positron pair production in relativistic heavy ion collisions. For a La[sup 57+] beam incident on Au, Ag, and Cu targets at energies of 0.405, 0.956, and 1.3 GeV/u we find that the cross sections for capture from pair production and the free pair production process increase with increasing collision energy at similar rates. Combining with uranium data reported previously gives a projectile atomic number dependence for 0.956 GeV/u ions on a Au target of [ital Z][sub [ital p]][sup 6.54[plus minus]0.65] for capture from pair production and [ital Z][sub [ital p]][sup 1.53[plus minus]0.80] for the free pair production process.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6947449
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 73:18; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
664300 -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC NUMBER
CAPTURE
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COPPER
CROSS SECTIONS
DATA
ELECTRON CAPTURE
ELECTRON-POSITRON INTERACTIONS
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
EXPERIMENTAL DATA
GEV RANGE
GOLD
HEAVY ION REACTIONS
INFORMATION
INTERACTIONS
IONS
LANTHANUM IONS
LEPTON-LEPTON INTERACTIONS
METALS
MULTICHARGED IONS
NUCLEAR REACTIONS
NUMERICAL DATA
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROJECTILES
RELATIVISTIC RANGE
SILVER
TARGETS
TRANSITION ELEMENTS