Abstract
Background: The HeBe reaction is important for the neutrino production in the sun's core and the production of Li during big bang nucleosynthesis. The reaction mechanism is characterized by a strong direct capture component and nearby broad unbound resonance levels.
Purpose: Recent experiments have opened up a new energy window into the reaction mechanism and it becomes more and more evident that, in order to understand the shape of the factor, theoretical calculations need to take into account possible resonance contributions from higher energies as well.
Method: In the present work, a relatively wide energy window was investigated, –1460 keV, by detecting the prompt rays from the reaction. An extensive -matrix analysis was performed, utilizing all modern literature capture data, as well as elastic scattering data, which are important in constraining some -matrix parameters.
Results: The new experimental data agree very well with the modern literature data. The final result from the -matrix fit gives a zero-energy factor of keV b. A table with the newly calculated reaction rate is given.
Conclusions: The simultaneous -matrix analysis of the HeBe and HeHe channels yielded a reliable fit, consistent with all the included experimental data sets. In order to further constrain the reaction rate within the -matrix framework, additional high-energy capture data, -ray angular distributions, and the inclusion of other relevant reaction channels are necessary.
4 More- Received 4 April 2013
- Corrected 3 July 2013
- Corrected 17 July 2013
DOI:https://doi.org/10.1103/PhysRevC.87.065804
©2013 American Physical Society
Corrections
3 July 2013
17 July 2013