Experimental data and theoretical results on charge loss delta-zeta greater than -27 and smaller -1, charge pickup delta-zeta = + 1, and total charge-changing cross sections for 158A GeV 208 Pb ions on CH2, C, A1, Cu, Su, and Au targets are presented. Calculations based on the revisited abrasion-ablation model for hadronic interaction and the relativistic electromagnetic dissociation (RELDIS) model far electromagnetic interaction describe the data. The decay of excited nuclear systems created in both types of interaction is described by the statistical multifragmentation model (SMM), which includes evaporation, fission, and multifragmentation channels. We show that at very high projectile energy the excitation energy of residual nuclei may be described on average as about 40 MeV per removed nucleon, with some increase in this value compared to fragmentation of intermediate energy heavy ions at about1A GeV. The importance of the electromagnetic interaction in production of 80-Rg, 81-T1, and 83Bi projectile fragments on heavy targets is shown. A strong increase of nuclear-charge cross sections, forming 83-Bi, is observed in comparison to similar measurements at 10.6A GeV. This process is attributed to the electromagnetic production of a negative pion by an equivalent photon, which is quantitatively described by the RELDIS model.

Charge-Changing Interaction of Ultrarelativistic Pb Nuclei

Ventura, A.
2004-12-01

Abstract

Experimental data and theoretical results on charge loss delta-zeta greater than -27 and smaller -1, charge pickup delta-zeta = + 1, and total charge-changing cross sections for 158A GeV 208 Pb ions on CH2, C, A1, Cu, Su, and Au targets are presented. Calculations based on the revisited abrasion-ablation model for hadronic interaction and the relativistic electromagnetic dissociation (RELDIS) model far electromagnetic interaction describe the data. The decay of excited nuclear systems created in both types of interaction is described by the statistical multifragmentation model (SMM), which includes evaporation, fission, and multifragmentation channels. We show that at very high projectile energy the excitation energy of residual nuclei may be described on average as about 40 MeV per removed nucleon, with some increase in this value compared to fragmentation of intermediate energy heavy ions at about1A GeV. The importance of the electromagnetic interaction in production of 80-Rg, 81-T1, and 83Bi projectile fragments on heavy targets is shown. A strong increase of nuclear-charge cross sections, forming 83-Bi, is observed in comparison to similar measurements at 10.6A GeV. This process is attributed to the electromagnetic production of a negative pion by an equivalent photon, which is quantitatively described by the RELDIS model.
Applicazioni di fisica e tecnologie nucleari
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/163
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
social impact