Physics – Nuclear Physics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvc..38.2019k&link_type=abstract
Physical Review C (Nuclear Physics), Volume 38, Issue 5, November 1988, pp.2019-2025
Physics
Nuclear Physics
8
Inelastic Neutron Scattering, 20<=A<=38, Origin, Formation, And Abundances Of The Elements
Scientific paper
The 22Na(n,p0), (n,p1), (n,α0), (n,α1), and (n,α2) cross sections have been measured at thermal neutron energy. In addition, the p0 and p1 cross sections have been measured from thermal energy to 420 eV and 35 keV, respectively. These new data were used to discern the structure of 23Na near the neutron threshold. In particular, it was found that a ((7/2)+ resonance dominates the p1 cross section but contributes very little to the p0 cross section. The p0, and also most probably the (n,α0) cross sections, are instead dominated by a separate ((5/2)+ resonance. The 22Na(n,p)22Ne astrophysical reaction rate, NA<σv>, was calculated using our new data and compared to published theoretical rates used in previous nucleosynthesis calculations. It was found that the theoretical rates are approximately a factor of 5 to 10 different from the experimental one at most temperatures measured. We discuss the possible implications of this difference on nucleosynthesis calculations for 22Na and 22Ne.
Koehler Paul E.
O'Brien H. A.
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