17O(n,α)14C cross section from 25 meV to approximately 1 MeV

Details 17O(n,α)14C cross section from 25 meV to approximately 1 MeV 17O(n,α)14C cross section from 25 meV to approximately 1 MeV

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvc..44.2788k&link_type=abstract

Physical Review C (Nuclear Physics), Volume 44, Issue 6, December 1991, pp.2788-2793

Physics

Nuclear Physics

18

Origin, Formation, And Abundances Of The Elements

Scientific paper

We have measured the 17O(n,α)14C cross section from thermal energy to approximately 1 MeV. A bump in the data near 3 keV could be fitted by a state whose properties are consistent with a known subthreshold J π=1- level at Ex=8.039 MeV. The cause of the 1/v cross section near thermal energy could not be determined although the known 2+ state at 8.213 MeV was found to be too narrow to contribute much to the thermal cross section. Our data are compared to measurements made via the inverse reaction. There are many differences between the two sets of data. The astrophysical reaction rate was calculated from the measured cross section. This reaction plays a role in the nucleosynthesis of heavy elements in nonstandard big-bang models. At big-bang temperatures, the experimental rate was found to be in fair agreement with the rate estimated from the previously known properties of states of 18O in this region. Furthermore, using the available information from experiments, it was estimated that the 17O(n,α)14C rate is approximately a factor of 103-104 times larger than the 17O(n,γ)18O rate at big-bang temperatures. As a result, there may be significant cycling between 14C and 17O resulting in a reduction of heavy-element nucleosynthesis.

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