Temperature Dependence of Electron Screening at Low Energy

  • For a deep understanding of the electron screening effects, we cooperated with the astrophysics group of Ruhr University to study the electron screening in the d(d,p)t reaction for the deuterated metals of groups 3 and 4 of the periodic table and the lanthanides, at a sample temperature T=200\textcelsius, using the D3+ beams provided by the 100kV accelerator of Dynamitron-Tandem-Laboratorium. The hydrogen solubility in the samples dropped to a level of a few percent (compared to T=20\textcelsius) and a large screening became observable. With the classical plasma model of Debye applied to the quasi-free metallic electrons, the deduced number of valence electrons per metallic atom agrees with the corresponding number from the Hall coefficient, for all metals investigated. Finally, we measured the screening for the metals Co and Pt as a function of sample temperature, in part between T=20\textcelsius and 340\textcelsius. The data agree with the Debye model; they represent the first observation of a temperature dependence of a nuclear cross section.
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  • [1] . BAI Xi-Xiang. Nucl. Phys. Rev., 2002, 19(1): 7(in Chinese)(白希祥.原子核物理评论,2002,19(1):7)2. Krauss A, Becker H W, Trautvetter H P et al. Nucl. Phys.,1987, A465:1503. Krauss A, Becker H W, Trautvetter H P et al. Nucl. Phys.,1987, A467:2734. Engstler S, Krauss A, Neldner K et al. Phys. Lett., 1988,B202:1795. Rolfs C E, Rodney W S. Cauldrons in the Cosmos.Chicago:The University of Chicago Press, 19886. Langanke K, Shoppa T D, Barnes C A et al. Phys. Lett.,1996, B369: 2117. Liolios T E. Phys. Rev., 2001, C63: 045801-18. Assenbaum H J, Langanke K, Rolfs C. Z. Phys., 1987,A327:4619. Czerski K, Hulke A, Biller A et al. Europhys. Lett., 2001,54(4): 44910. Raiola F, Migliardi P, Gyürky G et al. Eur. Phys. J., 2002,A13: 37711. Raiola F, Migliardi P, Gang L et al. Phys. Lett., 2002,B547: 19312. Banomo C, Fiorentini G, Fulop Z et al. Nucl. Phys., 2003,A719:37c13. Greife U, Gorris F, Junker M et al. Z. Phys., 1995, A351:10714. Landolt-Brnstein Numerical Data and Functional Relationshipsin Science and Technology. Berlin: Springer-Verlag, 1959. 166
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ZENG Sheng and LIAN Gang. Temperature Dependence of Electron Screening at Low Energy[J]. Chinese Physics C, 2005, 29(12): 1131-1135.
ZENG Sheng and LIAN Gang. Temperature Dependence of Electron Screening at Low Energy[J]. Chinese Physics C, 2005, 29(12): 1131-1135. shu
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Received: 2005-03-28
Revised: 1900-01-01
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Temperature Dependence of Electron Screening at Low Energy

    Corresponding author: ZENG Sheng,
  • China Institute of Atomic Energy,Beijing 102413,China2 Ruhr-Universitat,Bochum D-44780,Germany

Abstract: For a deep understanding of the electron screening effects, we cooperated with the astrophysics group of Ruhr University to study the electron screening in the d(d,p)t reaction for the deuterated metals of groups 3 and 4 of the periodic table and the lanthanides, at a sample temperature T=200\textcelsius, using the D3+ beams provided by the 100kV accelerator of Dynamitron-Tandem-Laboratorium. The hydrogen solubility in the samples dropped to a level of a few percent (compared to T=20\textcelsius) and a large screening became observable. With the classical plasma model of Debye applied to the quasi-free metallic electrons, the deduced number of valence electrons per metallic atom agrees with the corresponding number from the Hall coefficient, for all metals investigated. Finally, we measured the screening for the metals Co and Pt as a function of sample temperature, in part between T=20\textcelsius and 340\textcelsius. The data agree with the Debye model; they represent the first observation of a temperature dependence of a nuclear cross section.

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