Measurement of elastic 12C+alpha scattering: details of the experiment, analysis, and discussion of phase shifts
- Los Alamos National Laboratory
- UNIV OF FL
- UNIV OF NOTRE DAME
- GSI DARMSTADT
- FORSCHUNGSZENTRUM KARLSRUHE
- UNIV OF TORONTO
- TRIUMF
Recent global analyses of {sup 12}C({alpha},{gamma}){sup 16}O have incorporated both elastic-scallering and {beta}-decay data in addition to direct measurements. In that context, it has been shown that an improvement in the available elastic-scallering data could help determine the contribution of the two subthreshold states, 6.92(2{sup +}) and 7.12(1{sup -}) MeV, and with excellent statistics could restrict resonance parameters above the threshold. To this end angular distributions of {sup 12}C({alpha}, {alpha}){sup 12}C in the {alpha}-energy range of 2.6-8.2 MeV, at angles from 24 to 166 have been measured at the University of Notre Dame using an array of 32 silicon detectors. Details of the experiment are reported. In the present analysis, the phase shifts have been determined from our previously reported R-matrix fit to these data. The uncertainties in the R-matrix phase shifts ({ell} = 0...6) are derived by a new Monte Carlo analysis technique as described in the article. We provide these phase shifts here for general use, in particular for the improved analysis and extrapolation of the {alpha} radiative capture to low energies.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 972062
- Report Number(s):
- LA-UR-09-06560; LA-UR-09-6560; TRN: US1001458
- Journal Information:
- Physical Review C, Journal Name: Physical Review C
- Country of Publication:
- United States
- Language:
- English
Similar Records
The {beta}-delayed {alpha}-spectrum of {sup 16}N and the astrophysical aspects of the {sup 12}C({alpha},{gamma}){sup 16}O reaction
Measurements of branching ratios from the 7.12-MeV state in {sup 16}O and the {sup 12}C({alpha},{gamma}){sup 16}O reaction cross section