Fragmentation studies of 158 A GeV Pb ions using CR39 nuclear track detectors

“…Since we use electronic detectors instead of nuclear track detectors, the statistical significance of our data is expected to be larger than that of Refs. [3,4,6]. On the other hand, our ionization chamber resolves individual nuclear-charge peaks only down to Z = 55-60, whereas the track-detector experiment [3,6] was able to cover a much wider range of fragment charges ͑7 ഛ Z ഛ 81͒.…”

Section: Introductionmentioning

confidence: 99%

“…In a similar way, survey measurements of the fragmentation of ultrarelativistic 208 Pb nuclei have been performed in terms of charge-changing processes [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Charge-changing interactions of ultrarelativisticPbnuclei

et al. 2004

View full text Add to dashboard Cite

Experimental data and theoretical results on charge loss −27ഛ⌬Z ഛ −1, charge pickup ⌬Z = + 1, and total charge-changing cross sections for 158A GeV 82 208 Pb ions on CH 2 , C, Al, Cu, Sn, and Au targets are presented.Calculations based on the revisited abrasion-ablation model for hadronic interaction and the relativistic electromagnetic dissociation (RELDIS) model for 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 ϳ40 MeV per removed nucleon, with some increase in this value compared to fragmentation of intermediate energy heavy ions at ϳ1A GeV. The importance of the electromagnetic interaction in production of 80 Hg, 81 Tl, and 83 Bi projectile fragments on heavy targets is shown. A strong increase of nuclear-charge pickup 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.

show abstract

“…Previously, only the total dissociation cross sections of 158A-GeV Pb ions (including the hadronic contribution) have been measured [19,20]. Other groups have recently reported [21][22][23] charge-changing cross sections for the same ions.…”

Section: Introductionmentioning

confidence: 99%

Neutron emission in electromagnetic dissociation of ultrarelativistic Pb ions

Golubeva¹,

Guber²,

Karavicheva³

et al. 2005

Phys. Rev. C

View full text Add to dashboard Cite

New data on forward neutron emission in fragmentation of Pb ions on Al, Cu, Sn, and Pb nuclei are presented. The measurements were performed at the CERN SPS in the framework of the ALICE-LUMI experiment. The measured cross sections are compared with predictions of the RELDIS model for electromagnetic interactions and with results of the abrasion-ablation model for hadronic interactions. The electromagnetic excitation of a Pb projectile followed by single-and double-neutron emission is found to be the dominant process in full agreement with theoretical estimations. The measured 1nX cross sections are generally well described. The measured 2nX data, which are 4-5 times lower than the 1nX data, are slightly underestimated by theory. Nevertheless, the sum of 1nX and 2nX cross sections is in good agreement with theory. This confirms the predictive power of the RELDIS model, which can be used to calculate the sum of 1nX and 2nX emission rates for the purpose of calibration of luminosity measurements in PbPb collisions at the Large Hadron Collider at CERN.

show abstract

Fragmentation studies of 158 A GeV Pb ions using CR39 nuclear track detectors

Cited by 45 publications

References 28 publications

Pseudorapidity distributions of charged particles as a function of centrality in Pb–Pb collisions at 158 and 40 GeV per nucleon incident energy

Pseudorapidity distributions of charged particles as a function of centrality in Pb–Pb collisions at 158 and 40 GeV per nucleon incident energy

Charge-changing interactions of ultrarelativisticPbnuclei

Neutron emission in electromagnetic dissociation of ultrarelativistic Pb ions

Contact Info

Product

Resources

About