Il Nuovo Cimento A (1971-1996)

, Volume 110, Issue 2, pp 169–177 | Cite as

The Darmstadt effect: A new type of nuclear spectroscopy?

  • R. Alzetta
  • T. Bubba
  • G. Liberti
  • G. Preparata


We analyze the well-known and hitherto unsolved problem of the Darmstadt effect, through the idea that the observed sharp e1e2-lines reflect the interaction of the “coherent photon clouds” that are dragged along by the colliding heavy ions, and have their origin in the interaction of the zero-point fluctuations of the quantized e.m. field with the different collective states of the nuclei. We find such idea adequate to describe the experimental observations which in the future could give access to a new kind of nuclear spectroscopy.

PACS 25.70.Bc

Elastic and quasielastic scatering 

PACS 25.70.Ef


PACS 12.20.Ds

Specific calculations 


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  1. [1]
    Kienle P.,Annu. Rev. Nucl. Part. Sci.,36 (1986) 605;SALABURA P. et al., Phys. Lett. B,245 (1990) 153;Koenig I. et al.,Z. Phys. A,346 (1993) 153; for a review, seeBärr. et al.,Nucl. Phys. A,583 (1995) 237c.ADSCrossRefGoogle Scholar
  2. [2]
    Cowan T. et al., Phys. Rev. Lett.,56 (1986) 444.ADSCrossRefGoogle Scholar
  3. [3]
    Ahmad I. et al., Phys. Rev. Lett.,75 (1995) 2658;Berdermann E. et al., (e+ e-)-productionin heavy-ion collision near the Coulomb barrier, GSI Sci. Rep. 1996, GSI-1996, p. 105;Baumann J. et al., Search for e+ e- sum energy lines with the EPOS II spectrometer, GSI Sci. Rep. 1996, GSI-1996, p. 106.ADSCrossRefGoogle Scholar
  4. [4]
    Preparata G.,QED Coherence in Matter (World Scientific) 1995.Google Scholar
  5. [5]
    Del Giudice E., Giuffrida M., Mele R. andPreparata G.,Europhys. Lett.,14 (1991) 463;Phys. Rev. B,43 (1991) 5381;Del Giudice E., Giunta B. andPreparata G.,Nuovo Cimento D,14 (1992) 1145;Del Giudice, Mele R. andPreparata G.,Mod. Phys. Lett. B,7 (1993) 1851;Del Giudice E., Mele R., Muggia A. andPreparata G.,Nuovo Cimento D,15 (1993) 1279;Del Giudice E., Enz C. P., Mele R. andPreparata G.,Nuovo Cimento D,15 (1993) 1415;Arani R., Bono I., Del Giudice E. andPreparata G.,Int. J. Mod. Phys. B,9 (1995) 1813;Del Giudice E., Galimberti A., Gamberale L. andPreparata G.,Mod. Phys. Lett. B,9 (1995) 953.ADSCrossRefGoogle Scholar

Copyright information

© Società Italiana di Fisica 1997

Authors and Affiliations

  • R. Alzetta
    • 1
  • T. Bubba
    • 1
    • 3
  • G. Liberti
    • 1
    • 3
  • G. Preparata
    • 2
    • 4
  1. 1.Dipartimento di FisicaUniversità della CalabriaCosenzaItaly
  2. 2.Dipartimento di FisicaUniversità di MilanoMilanoItaly
  3. 3.INFNSezione di CosenzaCosenzaItaly
  4. 4.INFNSezione di MilanoMilanoItaly

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