Sub-Coulomb {alpha} Transfers on C{sup 12} and the C{sup 12}({alpha}, {gamma})O{sup 16} S Factor

Journal Article · Mon Nov 15 04:00:00 EST 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.83.4025· OSTI ID:20217952

Brune, C R ^[1]; Geist, W H ^[1]; Kavanagh, R W ^[2]; Veal, K D ^[1]

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1. University of North Carolina, Chapel Hill, North Carolina 27599-3255 and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)
2. W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125 (United States)

The {sup 12}C( {alpha}, {gamma}){sup 16}O reaction is crucial for the understanding of He burning in massive stars, but the low-energy cross section is highly uncertain. To address this problem we have measured at sub-Coulomb energies total cross sections for the {sup 12}C( {sup 6}Li, d){sup 16}O and {sup 12}C( {sup 7}Li, t) {sup 16}O reactions to the bound 2{sup +} and 1{sup -} states of {sup 16}O . The data are analyzed to obtain the reduced {alpha} widths of these states. Together with capture and phase-shift data, these results provide for a more accurate determination of the low-energy 12C({alpha}, {gamma}){sup 16}O S factor: S{sub E1}(0.3 MeV) =101{+-}17 keV b and S{sub E2}(0.3 MeV) =42{sup +16}{sub -23} keV b for the E1 and E2 multipole components of the reaction. (c) 1999 The American Physical Society.

• OSTI ID: 20217952
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
CARBON 12 TARGET
DEUTERIUM
EXPERIMENTAL DATA
LITHIUM 6 REACTIONS
LITHIUM 7 REACTIONS
NUCLEOSYNTHESIS
OXYGEN 16
STAR BURNING
TOTAL CROSS SECTIONS
TRANSFER REACTIONS
TRITIUM