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Zeitschrift für Physik A Hadrons and Nuclei

, Volume 354, Issue 3, pp 237–248 | Cite as

The fate of Li and Be in stars and in the laboratory

  • V. Castellani
  • G. Fiorentini
  • B. Ricci
  • O. Straniero
Article
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Abstract

We connect the observed under-abundances of Li and Be in dwarfs, with recent results on nuclear cross sections at low energies: for collisions of protons with atomic or molecular targets, the measured cross sections seem too high with respect to extrapolations for bare nuclei. Phenomenologically, these anomalous nuclear interactions can be described in terms of an effective screening potentialU lab in the range of few hundred eV: in the presence of the electron cloud, nuclei become more transparent to each other as if the effective collision energy is aumented byU lab. This implies that fusion cross sections are enlarged and at the same time elastic cross sections are lowered. If something similar occurs in stellar plasma, the nuclear burning temperatures are lowered, whereas diffusion processes are enhanced. We find that the observed Li and Be abundances in the Hyades and in the Sun can be reproduced for effective screening potentials of the plasma in the range of 600–700 eV, close to that found by experiments in the laboratory.

PACS

24.10 96.60 98.20 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • V. Castellani
    • 1
    • 2
    • 3
  • G. Fiorentini
    • 4
    • 5
  • B. Ricci
    • 6
    • 5
  • O. Straniero
    • 2
    • 3
  1. 1.Dipartimento di Fisica dell’Università di PisaPisaItaly
  2. 2.Osservatorio Astronomico di ColluraniaTeramoItaly
  3. 3.Istituto Nazionale di Fisica NucleareLNGSAssergiItaly
  4. 4.Dipartimento di Fisica dell’Università di FerraraFerraraItaly
  5. 5.Istituto Nazionale di Fisica NucleareSezione di FerraraFerraraItaly
  6. 6.Scuola di Dottorato dell’Università di PadovaPadovaItaly

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