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Title: The electron screening puzzle and nuclear clustering

Accurate measurements of nuclear reactions of astrophysical interest within, or close to, the Gamow peak show evidence of an unexpected effect attributed to the presence of atomic electrons in the target. The experiments need to include an effective "screening" potential to explain the enhancement of the cross sections at the lowest measurable energies. Despite various theoretical studies conducted over the past 20 years and numerous experimental measurements, a theory has not yet been found that can explain the cause of the exceedingly high values of the screening potential needed to explain the data. Furthermore, in this letter we show that instead of an atomic physics solution of the "electron screening puzzle", the reason for the large screening potential values is in fact due to clusterization effects in nuclear reactions, in particular for reaction involving light nuclei.
 [1] ;  [2] ;  [3] ;  [3]
  1. Univ. of Catania, Catania (Italy). Dept. of Physics and Astronomy; INFN-Laboratori Nazionali del Sud, Catania (Italy)
  2. Texas A&M University-Commerce, Commerce, TX (United States). Dept. of Physics and Astronomy; Texas A&M University, College Station, TX (United States). Dept. of Physics and Astronomy
  3. Univ. di Padova, Padova (Italy); INFN, Sezione di Padova, Padova (Italy)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 755; Journal Issue: C; Journal ID: ISSN 0370-2693
Research Org:
Texas A&M University
Sponsoring Org:
USDOE; U.S. NSF; Italian Ministry of University MIUR
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS fusion reactions; dependence