Abstract
Within a combined approach we investigate the main features of the production of hyper-fragments in relativistic heavy-ion collisions. The formation of hyperons is modeled within the UrQMD and HSD transport codes. To describe the hyperon capture by nucleons and nuclear residues a coalescence of baryons (CB) model was developed. We demonstrate that the origin of hypernuclei of various masses can be explained by typical baryon interactions, and that it is similar to processes leading to the production of conventional nuclei. At high beam energies we predict a saturation of the yields of all hyper-fragments, therefore, this kind of reactions can be studied with high yields even at the accelerators of moderate relativistic energies.
Highlights
The investigation of hypernuclei is a rapidly progressing field of nuclear physics, since these nuclei provide complementary methods to improve traditional nuclear studies and open new horizons for studying nuclear physics aspects related to particle physics and nuclear astrophysics
In previous publications we have considered the formation of hypernuclei within the Dubna Cascade Model (DCM) [36,37] and the Ultra-relativistic Quantum Molecular Dynamics model (UrQMD) [38]
We develop a generalization of the coalescence model [43], the coalescence of baryons (CB), which is applied after UrQMD and Hadron-String Dynamics (HSD) stage
Summary
The investigation of hypernuclei is a rapidly progressing field of nuclear physics, since these nuclei provide complementary methods to improve traditional nuclear studies and open new horizons for studying nuclear physics aspects related to particle physics and nuclear astrophysics (see, e.g., [1,2,3,4,5,6,7,8] and references therein). Many experimental collaborations (e.g., PANDA [9], FOPI/CBM, and Super-FRS/NUSTAR at FAIR [10,11]; STAR at RHIC [12]; ALICE at LHC [13]; BM@N and MPD at NICA [14]) have started or plan to investigate hypernuclei and their properties in hadron and heavy-ion induced reactions This represents an essential extension of nuclear/hypernuclear studies: The isospin space, particle unstable states, multiple strange nuclei, the production of hypermatter, and precision lifetime measurements are unique topics of these fragmentation reactions. In previous publications we have considered the formation of hypernuclei within the Dubna Cascade Model (DCM) [36,37] and the Ultra-relativistic Quantum Molecular Dynamics model (UrQMD) [38] These calculations include the capture of the produced hyperons in the potential of the spectator residues [29,39], and the coalescence into lightest clusters together with their thermal production in central collisions [25]. The advantage of this procedure is the possibility to predict the correlations of yields of hypernuclei, including their sizes, with the rapidity on the event-by-event basis, that is very essential for the planning of future experiments
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