Measurement and DWBA analysis of the 12C(6Li, d)16O α-transfer reaction cross sections at 48.2 MeV. R-matrix analysis of 12C()16O direct capture reaction data
✍ Scribed by A. Belhout; S. Ouichaoui; H. Beaumevieille; A. Boughrara; S. Fortier; J. Kiener; J.M. Maison; S.K. Mehdi; L. Rosier; J.P. Thibaud; A. Trabelsi; J. Vernotte
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 457 KB
- Volume
- 793
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
The angular distributions for low lying states of 16 O produced in the 12 C( 6 Li, d) 16 O α-transfer reaction at E6 Li (lab) = 48.2 MeV have been measured using a high energy resolution position sensitive detection system. The measured cross section data have been analyzed by the FRDWBA theory with a particular emphasis put on the states of astrophysical interest mainly the 1 -(7.12 MeV) state. Extracted values of nuclear level parameters (excitation energy, E x , line width, Γ c.m. , α-spectroscopic factor, S α , and reduced α-width, γ 2 α or θ 2 α ) are reported and discussed in comparison to previous ones. The used binding potential corresponds to a long nuclear interaction range (up to a channel radius a = 7.7 fm), suggesting that the channel radius a = 6.5 fm is likely suitable for the calculations of reduced α-widths near the nuclear surface. However, given that previous DWBA results are available for comparison only near the channel radius a = 5.5 fm, calculations have been carried out here for both three preceding a values. Formal values, 0.0036 θ 2 α (7.12) 0.152 and 0.019 θ 2 α (6.92) 0.096 of the reduced α-widths (a = 6.5 fm) of the 1 -(7.12 MeV) and 2 + (6.92 MeV) states have thus been derived. Furthermore, the R-matrix analysis of various data sets of importance to the 12 C(α, γ ) 16 O direct capture reaction has been carried out, leading to the range of values for the 1 -(7.12 MeV) state, 0.0096 θ 2 α (7.12) 0.0166, which is consistent with the preceding DWBA interval, and to a result for the E1 component of the reaction astrophysical factor,