Neutron emission in electromagnetic dissociation of ultrarelativistic Pb ions

Golubeva, M.B.; Guber, F.; Karavicheva, T.; Karpechev, E.; Kurepin, A.; Maevskaya, A.; Pshenichnov, I.; Reshetin, A.; Shileev, K.; Tiflov, V.; Topilskaya, N.; Szymański, P.; Efthymiopoulos, I.; Gatignon, L.; Cortese, P.; Dellacasa, G.; Arnaldi, R.; Marco, N. De; Ferretti, A.; Gallio, M.; Musso, A.; Oppedisano, C.; Piccotti, A.; Scomparin, E.; Vercellin, E.; Cicalò, C.; Puddu, G.; Siddi, E.

doi:10.1103/physrevc.71.024905

Cited by 13 publications

(25 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…RELDIS accurately reproduces this experimental observation and also predicts further increase of the mean number of neutrons and of the width of their multiplicity distribution as photon energy increases [9]. Calculations based on this model provide a good description of neutron emission in electromagnetic dissociation of Pb ions at the CERN SPS [10] and of Au ions at the Relativistic Heavy Ion Collider (RHIC) [11].…”

supporting

confidence: 59%

“…In EMD calculations, the native photonuclear reaction model of RELDIS can be replaced by the GNASH code [21], thus providing slightly different results for 1n and 2n yields. On the basis of this difference, the theoretical uncertainties listed in Table II are estimated. Our 2n to 1n ratio of ð22:5 AE 0:5 AE 0:9Þ% in single EMD can be compared to the value of ð19:7 AE 2:9Þ% reported for Pb-Pb collisions at 30 A GeV at the CERN SPS [10]. As predicted by RELDIS, the observed weak increase (around 1 standard deviation) of the 2n to 1n ratio with collision energy is due to additional 2n events produced by more energetic equivalent photons at the LHC.…”

mentioning

confidence: 85%

“…The measured 1n and 2n yields are much closer to RELDIS predictions compared to the 3n yields. This can be explained by the fact that RELDIS was already tuned by comparison with 1n and 2n data on photoabsorption on lead [5] and on EMD of 30 A GeV lead nuclei [10]. Unfortunately, the data on neutron emission induced by photons above 140 MeV are absent, while according to RELDIS almost half of 3n events is due to such energetic photons.…”

mentioning

confidence: 85%

“…5 presents total and partial EMD cross sections for emission of one and two neutrons measured by ALICE compared to CERN SPS data [10]. The results of the RELDIS model are also shown for a wide range of the projectile effective Lorentz-factor eff calculated in the rest frame of the collision partner.…”

mentioning

confidence: 98%

See 3 more Smart Citations

Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions atsNN=2.76 TeV

Abelev¹,

Adam²,

Adamová³

et al. 2012

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

The first measurement of neutron emission in electromagnetic dissociation of ^{208}Pb nuclei at the LHC is presented. The measurement is performed using the neutron zero degree calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at sqrt[s(NN)]=2.76 TeV with neutron emission are σ(singleEMD)=187.4 ± 0.2(stat)(-11.2)(+13.2) (syst) b and σ(mutualEMD) = 5.7 ± 0.1(stat) ± 0.4(syst) b, respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.

show abstract

supporting

confidence: 59%

mentioning

confidence: 85%

mentioning

confidence: 85%

mentioning

confidence: 98%

See 2 more Smart Citations

Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions atsNN=2.76 TeV

Abelev¹,

Adam²,

Adamová³

et al. 2012

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…[38]; Au-Pb collision data rescaled to Au-Au case) and right panel shows the results for Pb nuclei (data are from SPS [39] and LHC (ALICE) [34]). …”

Section: Discussionmentioning

confidence: 98%

Electromagnetic excitation of nuclei and neutron evaporation in ultrarelativistic ultraperipheral heavy ion collisions

et al. 2014

View full text Add to dashboard Cite

We present a new approach for calculating the electromagnetic excitation of nuclei as well as probabilities of emission and different distributions of neutrons from decays of excited nuclear systems for ultrarelativistic, ultraperipheral heavy ion collisions. Excitation functions for γ + Pb → Pb * and γ + Au → Au * are parametrized using physics-motivated components: the excitation of giant resonances, quasideuteron absorption mechanism, excitation of nucleon resonances, as well as high-energy dissociation of protons and neutrons. Neutron emission (up to ten neutrons) from low-energy excitations of 208 Pb and 197 Au is modeled in terms of the Hauser-Feshbach formalism. The probabilities of a given number of neutrons are calculated as a function of excitation energy in a Monte Carlo code GEMINI++. These probabilities are parametrized by smooth analytical functions. The results are compared to appropriate data for the γ Pb → Pb * → kn and γ Au → Au * → kn reaction. As an example, the approach is used for calculating electromagnetic excitation in ultraperipheral heavy ion collisions (UPC) processes. Both single-photon and double-photon excitations are included and discussed. Topological cross sections with a given number of neutrons in the forward and backward directions are calculated at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies. Excitation functions are presented. The results of the calculation are compared to Super Proton Synchrotron (SPS), RHIC, and more recent A Large Ion Collider Experiment (ALICE) experimental data and good agreement is achieved.

show abstract

On the performance of Zero Degree Calorimeters in detecting multinucleon events

Dmitrieva

Pshenichnov

2018

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

The facilities designed to study collisions of relativistic nuclei, such as the MPD at NICA (JINR), STAR at RHIC (BNL), ALICE, ATLAS and CMS at the LHC (CERN), are equipped with pairs of hadronic Zero Degree Calorimeters (ZDC) to detect forward nucleons at the both sides of the interaction point and estimate the collision centrality. The energy deposited in a ZDC fluctuates from one event to another, but on average it is proportional to the number of absorbed nucleons.Forward nucleons are also emitted in electromagnetic dissociation (EMD) of nuclei in ultraperipheral collisions, and they are used to monitor the luminosity.As known, ZDC energy spectra are specific to each facility, because they are affected by the ZDC acceptance, and the ZDC energy resolution depends on the beam energy. In this work a simple probabilistic model leading to handy formulas has been proposed to connect the numbers of emitted and detected forward nucleons taking into account a limited ZDC acceptance. The ZDC energy spectra from the EMD with the emission of one, two, three and four forward neutrons and protons have been modeled for the collision energies of NICA and the LHC. The case of a rather small ZDC acceptance has been investigated and a possibility to measure the inclusive nucleon emission cross section has been demonstrated.

show abstract

Neutron emission in electromagnetic dissociation of ultrarelativistic Pb ions

Cited by 13 publications

References 37 publications

Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions atsNN=2.76 TeV

Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions atsNN=2.76 TeV

Electromagnetic excitation of nuclei and neutron evaporation in ultrarelativistic ultraperipheral heavy ion collisions

On the performance of Zero Degree Calorimeters in detecting multinucleon events

Contact Info

Product

Resources

About