Abstract
The (n,), (n,), (n,), (n,), and (n,) cross sections have been measured at thermal neutron energy. In addition, the and 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 near the neutron threshold. In particular, it was found that a ( resonance dominates the cross section but contributes very little to the cross section. The , and also most probably the (n,) cross sections, are instead dominated by a separate ( resonance. The (n,pNe astrophysical reaction rate, 〈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 and .
- Received 23 May 1988
DOI:https://doi.org/10.1103/PhysRevC.38.2019
©1988 American Physical Society