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Title: Electron Screening: A Review

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 Zt scaling (with the metallic host) of the Debye radius. Preliminary results on the 7Li(p,{alpha}) and 6Li(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 (Ue = 900{+-}50 eV) observed in previous studies of themore » reactions 9Be(p,{alpha}) and 9Be(p,d), which was not understood at the time. A review of all these results will be presented.« less

Authors:
; ; ; ; ; ;  [1]; ; ; ; ;  [2]; ; ;  [3]; ;  [4];  [5];  [6];  [7]
  1. Institut fuer Physik mit Ionenstrhalen, Ruhr-Universitaet Bochum (Germany)
  2. Centro de Fisica Nuclear, Universidade de Lisboa (Portugal)
  3. Atomki, Debrecen (Hungary)
  4. China Institute of Atomic Energy, Beijing (China)
  5. School of Physics, University of Edinburgh (United Kingdom)
  6. INFN, Sezione di Padova, Padova (Italy)
  7. Dipartimento di Scienze Ambientali, Seconda Universita di Napoli, Caserta (Italy) (and others)
Publication Date:
OSTI Identifier:
20798550
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 831; Journal Issue: 1; Conference: International conference on frontiers in nuclear structure, astrophysics, and reactions - FINUSTAR, Isle of Kos (Greece), 12-17 Sep 2005; Other Information: DOI: 10.1063/1.2200942; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; BERYLLIUM 9; CORRELATIONS; DEUTERIUM TARGET; DEUTERON REACTIONS; ELECTRONS; LITHIUM 6; LITHIUM 7; LITHIUM 7 TARGET; PLASMA; POTENTIALS; PROTON REACTIONS; PROTON-NUCLEON INTERACTIONS; TEMPERATURE DEPENDENCE

Citation Formats

Raiola, F., Becker, H. W., Burchard, B., Di Leva, A., Rolfs, C., Schuermann, D., Strieder, F., Cruz, J., Fonseca, M., Jesus, A. P., Luis, H., Ribeiro, J. P., Gyuerky, G., Fueloep, Z., Somorijai, E., Zeng, S., Gang, L., Aliotta, M., Broggini, C., and D'Onofrio, A. Electron Screening: A Review. United States: N. p., 2006. Web. doi:10.1063/1.2200942.
Raiola, F., Becker, H. W., Burchard, B., Di Leva, A., Rolfs, C., Schuermann, D., Strieder, F., Cruz, J., Fonseca, M., Jesus, A. P., Luis, H., Ribeiro, J. P., Gyuerky, G., Fueloep, Z., Somorijai, E., Zeng, S., Gang, L., Aliotta, M., Broggini, C., & D'Onofrio, A. Electron Screening: A Review. United States. doi:10.1063/1.2200942.
Raiola, F., Becker, H. W., Burchard, B., Di Leva, A., Rolfs, C., Schuermann, D., Strieder, F., Cruz, J., Fonseca, M., Jesus, A. P., Luis, H., Ribeiro, J. P., Gyuerky, G., Fueloep, Z., Somorijai, E., Zeng, S., Gang, L., Aliotta, M., Broggini, C., and D'Onofrio, A. Wed . "Electron Screening: A Review". United States. doi:10.1063/1.2200942.
@article{osti_20798550,
title = {Electron Screening: A Review},
author = {Raiola, F. and Becker, H. W. and Burchard, B. and Di Leva, A. and Rolfs, C. and Schuermann, D. and Strieder, F. and Cruz, J. and Fonseca, M. and Jesus, A. P. and Luis, H. and Ribeiro, J. P. and Gyuerky, G. and Fueloep, Z. and Somorijai, E. and Zeng, S. and Gang, L. and Aliotta, M. and Broggini, C. and D'Onofrio, A.},
abstractNote = {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 Zt scaling (with the metallic host) of the Debye radius. Preliminary results on the 7Li(p,{alpha}) and 6Li(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 (Ue = 900{+-}50 eV) observed in previous studies of the reactions 9Be(p,{alpha}) and 9Be(p,d), which was not understood at the time. A review of all these results will be presented.},
doi = {10.1063/1.2200942},
journal = {AIP Conference Proceedings},
number = 1,
volume = 831,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2006},
month = {Wed Apr 26 00:00:00 EDT 2006}
}