FIAS Scientific Report 2011 - Frankfurt Institute for Advanced Studies ...

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Hypernuclei, dibaryon and antinuclei production in high energy heavy ion collisions Collaborators: J. Steinheimer 1 , K. Gudima 2 , A. Botvina, I. Mishustin, M. Bleicher, H. Stöcker 1 FIAS and Lawrence Berkeley National Laboratory, 2 Institute of Applied Physics, Academy of Sciences of Moldova We obtained results on hyper-nuclei, anti-nuclei and di-baryon production in heavy-ion collisions over a wide beam energy range. To explore the theoretical uncertainties we applied two distinct approaches: firstly, the thermal production with the UrQMD-hydro hybrid model and secondly, the coalescence calculation within the Dubna hadron cascade model. Concerning most hyper-nuclei and di-baryons both approaches agree well in their predictions which gives us confidence in robustness and significance of the obtained results. We find that both the non-equilibrium and thermal models may be considered as appropriate approaches to describe strange cluster production. In agreement with previous studies we demonstrate that the most promising energy range to produce hyper-clusters will be provided by the FAIR and NICA facilities, Elab ≈ 10 - 20A GeV. Anti-matter clusters heavier than ¯t are only feasible at RHIC and LHC energies. The most interesting result of our study is the apparent difference in the double ratio RH when we compare our thermal results with the coalescence. This difference indicates that the information on correlations of baryon number and strangeness are visible in the microscopic coalescence approach, while they are washed out in the thermal picture. This could open the opportunity to directly measure the strangeness-baryon correlation, which may be sensitive to the onset of deconfinement. The present status of the experimental data does unfortunately not allow for a comprehensive comparison with our model calculations. We hope that this situation will improve in the upcoming RHIC energy scan and FAIR experiments. �� Figure 1: Full acceptance yields per event of different (hyper-)nuclei created in most central collisions of Pb+Pb/Au+Au. Shown are the results from the thermal production in the UrQMD hybrid model (lines) as compared to DCM based coalescence results (symbols). �� Figure 2: Full acceptance yields per event of different di-baryons created in most central collisions of Pb+Pb/Au+Au. Shown are the results from the thermal production in the UrQMD hybrid model (lines) as compared to DCM based coalescence results (symbols). Related publications and talks in 2011: 1) J. Steinheimer, A. Botvina, K. Gudima, I. Mishustin, S. Schramm, M. Bleicher, H. Stöcker, From FAIR to RHIC, hyper clusters and an effective strange EoS for QCD, talk given at the international conference on Strangeness in Quark Matter 2011 in Krakow; arXiv:1112.5284 [hep-ph]. 2) J. Steinheimer, A. Botvina, K. Gudima, I. Mishustin, S. Schramm, M. Bleicher, H. Stöcker, Hypernuclei, dibaryons and antinuclei production in high-ebergy heavy-ion collisions: Thermal production vs. Coalescence, to be submitted in Phys. Lett. B. 32 ��
On production and properties of multi-lambda hypernuclei Collaborators: C. Samanta 1 , A.S. Botvina, I. Mishustin, W. Greiner 1 Saha Institute of Nuclear Physics, Kolkata, India Relativistic heavy-ion collisions offer the possibility of creating excited nuclear systems with hyperons. Hyperons are mostly produced in the midrapidity zone, where hadrons interact strongly whith each other. However, since Λ-particles have a broad rapidity distribution, some of them can be absorbed in the spectator residues of the projectile and target. Once produced and beeing excited, such spectator nuclear system begins to expand and finally breaks up into many composite fragments. Some fragments coming out of this disintegration may contain one or more hyperons. We use the statistical multifragmentation model, successfully used earlier, for the description of multifragmentation data, to predict relative yields of Λ-hypernuclei containing up to 4Λs. We have used two versions of the mass formula for calculation of observables to get a range of uncertainty associated with properties of unknown hyper-nuclei. Both mass formulae show increasing binding of Λ-hypernuclei with increasing Λ multiplicity, and, as a result, the large relative yield of multi Λ hypernuclei within some temperature range. The yields of hyper-fragments are found to be sensitive to the details of their mass formulae in the part related to the hyperon sector. Calculated mass distributions of the multi-lambda hypernuclei (Fig. 1) are found to be more probable for nuclei with higher Z values. All fragments have broad gaussian-like isotope distributions signaling that very exotic nuclei can be produced with noticeable probability. Figure 1: Mass distributions of hyperfragments with 0, 1, 2, 3 and 4Λs produced after multifragmentation of sources with A0 = 50, Z0 = 20 and nY = 3 (top) and nY = 4 (bottom) at temperature T = 4 MeV. Calculations are made with the the generalised mass formula of Samanta et al. Results are presented for total charge Z = 5 (left) and 15 (right) respectively. Related publications and talks in 2011: 1) C. Samanta, Strangeness: A new dimension in nuclear physics, Symposium on Exciting Physics, Makutsi, South Africa, November 13-20, 2011. 2) C. Samanta, Strange to superstrange nuclei, 5th DAE-BRNS workshop on Hadron Physics, BARC, Mumbai, India, October 31-November 4, 2011. 3) C. Samanta, Multi-strange nuclei in spectator fragmentation reactions, International Conference on Nuclear Fragmentation 2011 (NUFRA2011), Kemer (Antalya), Turkey, October 2-9, 2011. 4) C. Samanta, A.S. Botvina, I. Mishustin, W. Greiner, On production and properties of multi-lambda hypernuclei, submitted for publication in J. Phys. G: Nucl. Part. Phys. 33
Page 1 and 2: FIAS Scientific Report 2011
Page 3: FIAS Scientific Report 2011 Table o
Page 6 and 7: Physics Research highlights 2011 To
Page 9 and 10: 1. Partner Research Centers 9
Page 11 and 12: ExtreMe Matter Institute EMMI by Ca
Page 13 and 14: Bernstein Focus Neurotechnology Fra
Page 15 and 16: 2. Graduate Schools 15
Page 17 and 18: participants reported on their proj
Page 19 and 20: Courses offered at FIGSS Summer Sem
Page 21 and 22: 3. FIAS Scientific Life 21
Page 23 and 24: 28.07.2011 Prof. Dr. Victor Flambau
Page 25 and 26: Conferences and meetings (co)organi
Page 27 and 28: 4. Research Reports 4.1 Nuclear Phy
Page 29 and 30: Hydrodynamics of a quark droplet Co
Page 31: Production of hyper-nuclei in react
Page 35 and 36: Monte Carlo modeling microdosimetry
Page 37 and 38: Monte Carlo simulation of the spall
Page 39 and 40: Dimuon radiation within a (3+1)d hy
Page 41 and 42: Initial state anisotropies and thei
Page 43 and 44: Chiral hadronic model including res
Page 45 and 46: Trace anomaly and the vector coupli
Page 47 and 48: Dileptons from the strongly interac
Page 49 and 50: Space-time evolution of the magneti
Page 51 and 52: Extreme isospin in heavy nuclei Col
Page 53 and 54: Production of heavy and superheavy
Page 55 and 56: The phase diagram in T -µB-Nc spac
Page 57 and 58: Critical Zeeman Fields for Unitary
Page 59 and 60: BCS-BEC Crossover in 2D Fermi Gases
Page 61 and 62: Applications of a chiral SU(3) mode
Page 63 and 64: The phase diagram of black holes in
Page 65 and 66: Black holes in short scale modified
Page 67 and 68: Fractal dimensions and micro-struct
Page 69 and 70: Untangling the interactions between
Page 71 and 72: Stimulus information coded by spike
Page 73 and 74: Non-stationarity of neuronal activi
Page 75 and 76: Timescale of information processing
Page 77 and 78: Discovery of agency in 6 and 8-mont
Page 79 and 80: Power spectra of the natural input
Page 81 and 82: Self-organization in recurrent neur
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Learning mechanisms underlying visu
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Emerging Bayesian priors in a self-
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Non-linear generative models and th
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Preference elicitation and Bayesian
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4.3 Biology, Chemistry, Molecules,
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DNA unzipping Collaborators: S.N. V
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Statistical mechanics of protein fo
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Phase transitions in large clusters
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Photo-processes in fullerenes and e
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Assessment of complex DNA damage Co
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Novel light sources: Crystalline un
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Monte-Carlo code for channeling dyn
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Programs for many-body descriptions
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Are 12 C radiation effects in liver
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Objective identification of residue
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Structural basis for the dual RNA-r
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The ALICE High Level Trigger Collab
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Arithmetic over Galois fields on mo
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High Performance GPU-based DGEMM an
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How stable are transport model resu
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5. Talks and Publications 123
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Conference and Seminar Talks 2011
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Conference and Seminar Talks 2011 W
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FIAS conference abstracts and poste
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FIAS conference abstracts and poste
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FIAS Publications 2011 - Journal pu
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FIAS publications 2011 - Conference
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FIAS publications 2011 - Patents 24
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