Electron Screening: A Review

Journal Article · Wed Apr 26 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2200942· OSTI ID:20798550

Raiola, F; Becker, H W; Burchard, B; Di Leva, A; Rolfs, C; Schuermann, D; Strieder, F ^[1]; Cruz, J; Fonseca, M; Jesus, A P; Luis, H; Ribeiro, J P ^[2]; Gyuerky, G; Fueloep, Z; Somorijai, E ^[3]; Zeng, S; Gang, L ^[4]; Aliotta, M ^[5]; Broggini, C ^[6]; D'Onofrio, A ^[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)

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.

• OSTI ID: 20798550
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 831; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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