Hypernuclear production cross section in the reaction of 6Li + 12C at 2 A GeV

Abstract

Hypernuclear production cross sections have been deduced for the first time with induced reaction of heavy ion beam on fixed target and by means of the invariant mass method by the HypHI Collaboration exploiting the reaction of 6 Li + 12 C at 2 A GeV or √ s N N = 2.70 GeV. A production cross section of 3.9 ± 1.4 μb for 3 H and of 3.1 ± 1.0 μb for 4 H respectively in the projectile rapidity region was inferred as well as the total production cross section of the hyperon was measured and found to be equal to 1.7 ± 0.8 mb. A global fit based on a Bayesian approach was performed in order to include and propagate statistical and systematic uncertainties. Production ratios of 3 H/ 4 H, 3 H/ and 4 H/ were included in the inference procedure. The strangeness population factors S 3 and S 4 of 3 H and 4 H respectively were extracted. In addition, the multiplicities of the hyperon, 3 H, and 4 H together with the rapidity and transversal momentum density distributions of the observed hypernuclei were extracted and reported.

Parton-hadron-quantum-molecular dynamics: A novel microscopic n -body transport approach for heavy-ion collisions, dynamical cluster formation, and hypernuclei production

“…The study of cluster and hypernucleus production, which reflects the phase space density during the expansion phase, is of particular interest from experimental as well as from theoretical side. Experimentally clusters have been observed at all energies: from low energiesmeasured by ALADIN [6,7], INDRA [8], FOPI [9], Hy-pHI [10] Collaborations, to (ultra-) relativistic energiesmeasured by NA49 [11], STAR [12,13], ALICE [14][15][16] Collaborations).…”

“…[17][18][19][20][21][22][23][24]. Recent experimental results [10,13,15] have shown that hypernuclei and anti-hypernuclei can be formed in heavy-ion collisions from SIS to LHC energies. Detailed theoretical calculations have identified two sources of hypernuclei in these reactions: In the overlap region of target and projectile, hyperons are produced in energetic first chance NN collisions.…”

Recent Progress of the HypHI Project at GSI and Its Perspective at FAIR

“…Details of the analyses are given in [11]. A production cross section of 3.9 ± 1.4 µb for 3 Λ H and of 3.1 ± 1.0 µb for 4 Λ H respectively in the projectile rapidity region was deduced as well as the total production cross section of the Λ hyperon measured to be 1.7 ± 0.8 mb.…”

“…σ sys and σ prior stand for the systematic uncertainties and the prior sensitivity uncertainties. The table is taken from [11].…”

“…Data analyses of the Phase 0 experiment have been already completed, and we will briefly summarise the results in this article. Details of the Phase 0 experiments and of the analyses discussed in this article can be found in [9] for 3 Λ H and 4 Λ H as well as for the Λ-hyperon, in [10] for observed signals with d+π − and t+π − final states and in [11] for production cross section values and kinematics for 3 Λ H and 4 Λ H. Results of the Phase 0.5 experiments will be published in other articles. In the end of this article, we briefly discuss ideas of future experiments at GSI and FAIR.…”