Volume 113, Number 2, January 2016
|Number of page(s)||6|
|Published online||11 February 2016|
Screening and resonance enhancements of the 2H(d, p)3H reaction yield in metallic environments
1 Institute of Physics, University of Szczecin - ul. Wielkopolska 15, PL-70-451 Szczecin, Poland
2 Institute for Solid-State Nuclear Physics - Leistikowstr. 2, D-14053 Berlin, Germany
3 Institute of Physics, Humboldt-Universität zu Berlin - Brook-Taylor-Str. 6, D-12489 Berlin, Germany
Received: 4 October 2015
Accepted: 25 January 2016
The reaction cross-section has been measured for deuteron energies below 25 keV in a deuterized Zr target under improved ultra-high-vacuum conditions and controlled target surface contamination. The increase of reaction enhancement factors towards lower energies is much weaker than that determined before and can result not only from the electron screening effect but also from a suggested 0+ threshold resonance in 4He. The cross-section calculations performed within the T-matrix approximation enable to estimate a coherent resonance contribution and explain the observed energy dependence of the enhancement factors. Additionally, indications for the increase of the screening energies due to impurities at the target surface could be found.
PACS: 25.45.-z – 2H-induced reactions / 24.30.-v – Resonance reactions / 26.20.-f – Hydrostatic stellar nucleosynthesis
© EPLA, 2016
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