Production of light nuclei in relativistic heavy-ion collisions

Barrette, J.; Bellwied, R.; Braun‐Munzinger, P.; Cleland, W.; Cormier, T. M.; David, G.; Dee, J.; Diebold, G. E.; Dietzsch, O.; Germani, J. V.; Gilbert, S.; Greene, S. V.; Hall, J. R.; Hemmick, T. K.; Herrmann, N.; Hong, B.; Jayananda, K.; Kraus, D.; Kumar, B. S.; Lacasse, R.; Lissauer, D.; Llope, W. J.; Ludlam, T.; McCorkle, S.; Majka, R.; Mark, S. K.; Mitchell, J. T.; Muthuswamy, Moorthy S.; O’Brien, E.; Pruneau, C.; Rotondo, F. S.; Sandweiss, J.; daSilva, N. C.; Sonnadara, D. U. J.; Stachel, J.; Takai, H.; Takagui, E. M.; Throwe, T. G.; Wolfe, D.; Woody, C. L.; Xu, N.; Zhang, Y.; Zhang, Z.; Zou, C.

doi:10.1103/physrevc.50.1077

Cited by 51 publications

(19 citation statements)

References 29 publications

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“…The penalty factor, namely the reduction of the yield by adding one nucleon, is 307 ± 76. Such an exponential decrease has already been observed at lower incident energies starting from those provided by the AGS [16,18,19,21], yet with different slopes.…”

Section: B Spectra Of Nucleimentioning

confidence: 79%

“…The production of light nuclei has attracted attention already at lower incident energies in heavy-ion collisions at the AGS, SPS, and RHIC [16][17][18]. A study of the dependence on √ s NN is of particular interest, because different production mechanisms might dominate at various energies, e.g., a formation via spectator fragmentation at lower energies or via coalescence/thermal mechanisms at higher ones.…”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

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Production of light nuclei and anti-nuclei inppand Pb-Pb collisions at energies available at the CERN Large Hadron Collider

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

Phys. Rev. C

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179

172

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The production of (anti-)deuteron and (anti-) 3 He nuclei in Pb-Pb collisions at √ s NN = 2.76 TeV has been studied using the ALICE detector at the LHC. The spectra exhibit a significant hardening with increasing centrality. Combined blast-wave fits of several particles support the interpretation that this behavior is caused by an increase of radial flow. The integrated particle yields are discussed in the context of coalescence and thermal-statistical model expectations. The particle ratios, 3 He /d and 3 He /p, in Pb-Pb collisions are found to be in agreement with a common chemical freeze-out temperature of T chem ≈ 156 MeV. These ratios do not vary with centrality which is in agreement with the thermal-statistical model. In a coalescence approach, it excludes models in which nucleus production is proportional to the particle multiplicity and favors those in which it is proportional to the particle density instead. In addition, the observation of 31 anti-tritons in Pb-Pb collisions is reported. For comparison, the deuteron spectrum in pp collisions at √ s = 7 TeV is also presented. While the p/π ratio is similar in pp and Pb-Pb collisions, the d/p ratio in pp collisions is found to be lower by a factor of 2.2 than in Pb-Pb collisions.

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Section: B Spectra Of Nucleimentioning

confidence: 79%

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

Production of light nuclei and anti-nuclei inppand Pb-Pb collisions at energies available at the CERN Large Hadron Collider

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

Phys. Rev. C

Self Cite

179

172

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“…For the chemical freeze-out temperature that currently best describes the LHC data (T ch = 156 MeV), the expected hypertriton yield is dN/dy= 1 ×10 −4 . For 4 Λ H a value dN/dy = 2 ×10 −7 is foreseen, and it is reasonable to assume the same value for 4 Λ He which has a similar mass. For the estimation of the number of reconstructed hypernuclei, the decay branching ratios (B.R.)…”

Section: Discussionmentioning

confidence: 99%

“…In fact, while many Λ-hypernuclei have been observed so far, the first observation of an anti-hypernucleus is rather recent and was reported in the analysis of Au-Au collisions at √ s NN = 200 GeV by the STAR Collaboration at RHIC [3]. Since light hypernuclei are weakly bound nuclear systems, they are sensitive probes of the final stages of the evolution of the fireball formed in the heavy-ion collisions [4].…”

Section: Introductionmentioning

confidence: 99%

Production of (Anti-)(Hyper)nuclei in Pb–Pb Collisions Measured with ALICE at the LHC

Piano¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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In high-energy heavy-ion collisions nuclei and hypernuclei emerge from the hot and dense fireball formed in the reaction region. Thanks to its excellent particle identification and momentum measurement performance, the ALICE detector allows for the identification of deuterons, tritons, 3 He and 4 He and the corresponding anti-nuclei. This is achieved via the measurement of their specific energy loss in the Time Projection Chamber and the velocity measurement by the Time-Of-Flight detector. Moreover, thanks to the Inner Tracking System capability to separate primary from secondary vertices, it is possible to identify (anti-)hypertriton through the mesonic weak decay 3 Λ H → ( 3 He + π − ). The direct decay time measurement of (anti-)hypertriton is difficult, but the excellent determination of primary and decay vertices, i.e. of the decay length, allows for the measurement of mean lifetime via an exponential fit of the proper decay time distribution. Results on the measurement of the hypertriton mean lifetime will be shown. Plans for the future LHC Run2 and Run3, with the expected improvements in the statistics and precision, will also be presented.

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“…Measurements of deuteron coalescence in high energy heavy ion collisions have been reported previously both at AGS energies [20][21][22][23][24] from 10 to 14.6 A·GeV/c and at SPS energies [25][26][27][28][29] at 200 or 158 A·GeV/c. Of these, the AGS results of Si+A [20] and Au+Au [22] collisions as well as the SPS results of [25] are of special importance for the present study because they also deal with the systematics of deuteron production as function of rapidity, centrality, mass and transverse mass.…”

Section: Introductionmentioning

confidence: 99%

Deuteron and triton production with high energy sulphur and lead beams

Bearden¹,

Bøggild²,

Boissevain

et al. 2002

Eur. Phys. J. C

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Abstract. Proton and deuteron production has been observed in S+S and S+Pb collisions at 200 A·GeV and in Pb+Pb reactions at 158 A·GeV at the CERN SPS accelerator. For Pb+Pb triton production was also measured. The p and d spectra as well as the p and t spectra were observed in similar rapidity ranges and over similar ranges of transverse momenta per nucleon, making it possible to interpret the cross sections of the composite particles in terms of coalescence mechanisms. Volumes of homogeneity were extracted and compared to pion-pair HBT interferometry results. Special attention is given to the dependence on transverse mass, centrality and rapidity.

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Production of light nuclei in relativistic heavy-ion collisions

Cited by 51 publications

References 29 publications

Production of light nuclei and anti-nuclei inppand Pb-Pb collisions at energies available at the CERN Large Hadron Collider

Production of light nuclei and anti-nuclei inppand Pb-Pb collisions at energies available at the CERN Large Hadron Collider

Production of (Anti-)(Hyper)nuclei in Pb–Pb Collisions Measured with ALICE at the LHC

Deuteron and triton production with high energy sulphur and lead beams

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