Electron screening: A review

F. Raiola, J. Cruz, G. Gyurky, Z. Fulop, S. Zeng, M. Aliotta, H. W. Becker, B. Burchard, C. Broggini, A. Di Leva, A. D'Onofrio, A. Fonseca, L. Gang, L. Gialanella, G. Imbriani, A. P. Jesus, M. Junker, K. U. Kettner, B. Limata, H. LuisJ. P. Ribeiro, V. Roca, C. Rolfs, A. Romano, D. Schuermann, E. Somorijai, F. Strieder, F. Terrasi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Understanding the electron screening effect in the laboratory is critical for a correct interpretation of low-energy nuclear reactions in stars. Extensive studies of the electron screening effect in deuterated metals (54 metals) and other environments have been carried out in Bochum in the last 4 years. Experimental results of anomalous enhancements have been interpreted in terms of the Debye plasma model applied to quasi-free metallic electrons. For the d(d,p)t reaction in metallic environments, the variation of hydrogen solubility in the samples as a function of temperature has also been measured, showing an anti-correlation with screening enhancement as expected. Within this model, the deduced number of valence electrons per metallic atom also agrees with the corresponding number from the Hall coefficient. Recently, the expected temperature dependence of the screening potential has been verified together with the expected Z(t) scaling (with the metallic host) of the Debye radius. Preliminary results on the Li-7(p,alpha) and Li-6(p,alpha) reactions in Li2WO4 insulator, Li metal and PdLi alloys confirm the expected behaviour of the screening effect and further supports the applicability of the Debye model. Indeed, the proposed model also accounts for the high screening potential (U-e = 900 +/- 50 eV) observed in previous studies of the reactions Be-9(p,alpha) and Be-9(p,d), which was not understood at the time. A review of all these results will be presented.

Original languageEnglish
Title of host publicationFrontiers in Nuclear Structure Astrophysics, and Reactions: FINUSTAR
EditorsS Harissopulos, P Demetriou, R Julin
Place of PublicationMELVILLE
PublisherAmerican Institute of Physics
Pages296-303
Number of pages8
ISBN (Print)0-7354-0323-6
Publication statusPublished - 2006
EventInternational Conference on Frontiers in Nuclear Structure, Astrophysics and Reactions (FINUSTAR) - Kos
Duration: 12 Sep 200517 Sep 2005

Conference

ConferenceInternational Conference on Frontiers in Nuclear Structure, Astrophysics and Reactions (FINUSTAR)
CityKos
Period12/09/0517/09/05

Keywords

  • nuclear reactions
  • plasma
  • electron screening
  • D+D FUSION REACTIONS
  • DEUTERON BOMBARDMENT
  • S(E) FACTOR
  • ENHANCEMENT
  • METALS
  • PD

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