Comparison of experimental and calculated S-factors of the p-process reaction Sm-144(alpha,gamma)Gd-148

Somorjai, E. and Fulop, Z. and Kiss, A. Z. and Rolfs, C. E. and Trautvetter, H. P. and Greife, U. and Junker, M. and Goriely, S. and Arnould, M. and Rayet, M. and Rauscher, T. and Oberhummer, H.. (1998) Comparison of experimental and calculated S-factors of the p-process reaction Sm-144(alpha,gamma)Gd-148. In: Stellar evolution, stellar explosions and galactic chemical evolution : proceedings of the 2nd Oak Ridge Symposium on Atomic and Nuclear Astrophysics, Oak Ridge, Tennessee, 2 - 6 December 1997. Bristol [u.a.], pp. 607-611.

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Official URL: http://edoc.unibas.ch/dok/A5839339

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The cross section of the Sm-144(alpha,gamma)Gd-148 reaction has been measured at bombarding energies in the 10.5 - 13.4 MeV range using an activation method based on the off-line alpha-activity measurement of the Gd-148 residual nucleus. The long measuring time of the alpha-decay has required the use of etched track detectors. The resulting cross sections and astrophysical S-factors are compared to new statistical model (Hauser-Feshbach) calculations. The experimental data are strongly overestimated by calculations using global alpha - nucleus optical potentials. The calculated values with potential derived from Sm-144+alpha scattering experiment at E-lab=20 MeV are in good agreement with the experimental results at energies E(cm)greater than or equal to 11.5 MeV, however, largely deviate at lower energies. A fitted Woods-Saxon optical potential, describing remarkably well the experimental data in the whole energy region, clearly indicates a strong energy-dependence of the alpha-nucleus potential.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Conference or Workshop Item, refereed
Conference or workshop item Subtype:Conference Paper
Publisher:Institute of Physics
Note:Publication type according to Uni Basel Research Database: Conference paper
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Last Modified:08 Jun 2012 06:54
Deposited On:08 Jun 2012 06:33

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