56. International Winter Meeting on Nuclear Physics

Session

Monday Afternoon

22 Jan 2018, 17:00

Bormio, Italy

24. Inclusive J/ψ and ψ(2S) production in p-Pb collisions with ALICE at the LHC

Dr Biswarup Paul (Universita e INFN Torino (IT))

22/01/2018, 17:00

Relativistic Heavy Ion Physics

Poster

The ALICE Collaboration has studied inclusive J/$\psi$ and $\psi$(2S) production in p-Pb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 5.02 and 8.16 TeV. The measurements were performed at forward (2.03 $<$ $y_{\mathrm{c}\mathrm{m}\mathrm{s}}$ $<$ 3.53), mid ($-$1.37 $<$ $y_{\mathrm{c}\mathrm{m}\mathrm{s}}<$ 0.43) and backward ($-$4.46 $<$ $y_{\mathrm{c}\mathrm{m}\mathrm{s}}$ $<$ $-$2.96) centre of mass rapidities. In this presentation, the nuclear modification factor of...

27. Studies of the nucleosynthesis ${}^{12}C(\alpha ,\gamma ){}^{16}O$ in inverse kinematic for the MAGIX experiment on MESA

Mr Stefan Lunkenheimer (KPH)

22/01/2018, 17:03

Nuclear Structure and Astrophysics

Poster

MAGIX is a versatile fixed-target experiment and will be built on the new accelerator MESA (Mainz Energy-Recovering Superconducting Accelerator) in Mainz. The accelerator will deliver polarized electron beams with currents up to $1\mathrm{mA}$ and energy up to $105\mathrm{MeV}$. Using its internal gas-target, MAGIX will reach a luminosity of...

15. Investigating the EMC Effect in Highly-Virtual Nucleons at Jefferson Lab

Efrain Segarra (Massachusetts Institute of Technology)

22/01/2018, 17:06

Hadron Physics

Poster

The EMC effect, the phenomenon by which quark distributions are modified in bound nucleons, has defied explanation since its discovery over 30 years ago. Recently, there have been indications, experimentally and theoretically, that the EMC effect may be linked to high-momentum nucleons. Rather than the EMC effect being caused by a modest modification in all nucleons, it is possible that highly...

58. An ATCA-based Readout System for the Belle II Pixel Detector

Mr Klemens Lautenbach (JLU Giessen)

22/01/2018, 17:09

Applications and Instrumentations

Poster

The future Belle II experiment will reach a total luminosity of $8\cdot {10}^{35}c{m}^{-2}{s}^{-1}$. With such high luminosities, the innermost detector, the Pixeldetector (PXD), will produce raw data rates of up to 20 GB/s. In order to reduce these rates, a high bandwidth data aquisition and data reduction system for the PXD is required. The so-called ONline SElection Node (ONSEN)-system will...

23. Characteristics of charmonium production in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 5.02 TeV measured with ALICE.

Pascal Dillenseger (for the ALICE Collaboration)

22/01/2018, 17:12

Relativistic Heavy Ion Physics

Poster

J/$\psi$ measurements in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 2.76 TeV clearly show a smaller suppression than the one expected from color screening, when compared to binary-scaled pp collisions. The increased yield in Pb$-$Pb collisions can be explained by models that contain a (re)generation component, based on the (re)combination of c$\bar{\mathrm{c}}$-quarks. Hence, one of the...

45. Coherent pi^0 photoproduction on spin-zero nuclei

Mr Viacheslav Tsaran (JGU Mainz)

22/01/2018, 17:15

Nuclear Structure and Astrophysics

Poster

The method of coherent ${\pi }^0$ photoproduction ( $\gamma$+ A${}_{\text{g.s.}}$ $\to$ ${\pi }^0$+ A${}_{\text{g.s.}}$, where A${}_{\text{g.s.}}$ is a nucleus in its ground state) provides an efficient tool to study nucleon distribution and the neutron skin of various nuclei. We investigate the case of nuclei with zero spin and isospin from the theoretical point of view in the framework of a...

28. Correlation Analysis Tool using the Schrödinger equation (CATS)

Mr Dimitar Mihaylov (TU Munich)

22/01/2018, 17:18

Hadron Physics

Poster

Femtoscopy is a method used to investigate particle correlations by using the experimentally accessible two-particle momentum correlation function C(k). This function can be mathematically obtained by integrating the product of the source function and the two-particle wave function. The main goals of femtoscopy are to investigate the properties of the emission source and the interaction...

35. Lattice QCD studies of pseudo-PDFs

Dr Savvas Zafeiropoulos (Universitaet Heidelberg)

22/01/2018, 17:21

Poster

Ioffe-time distributions, which are functions of the Ioffe-time $\nu$, are the Fourier transforms of parton distribution functions with respect to the momentum fraction variable $x$. These distributions can be obtained from appropriate equal time, quark bilinear hadronic matrix elements which can be calculated from first principles via lattice QCD methods. Here, we present the first...

12. Diffusion of conserved charges in relativistic heavy ion collisions

Mr Moritz Greif (Goethe University Frankfurt)

22/01/2018, 17:24

Relativistic Heavy Ion Physics

Poster

We calculate all diffusion constants of the conserved baryon, electric and strangeness charge in hot relativistic multi-component systems using kinetic theory. Applying the algorithm for massive pions, kaons, nucleons, lambda- and sigma-baryons, with resonance cross sections when possible, we present for the first time realistic values for the hadronic diffusion coefficient matrix. These...

7. Lifetime measurements using a fast timing array of LaBr3 detectors

Mr Lumkile Msebi (University of Johannesburg)

22/01/2018, 17:27

Nuclear Structure and Astrophysics

Poster

Characteristic decay properties of radionuclides are essential in the study of nuclear spectroscopy. Lifetime measurements and transition moments for excited nuclear levels form part of this extensive study that seeks to unveil properties of nuclear structure. Scintillation detectors prove to be formidable in gamma ray detection and lifetime measurements. With advent of LaBr₃...

61. Cross section measurements of the elastic electron - deuteron scattering

Yvonne Stöttinger (Universität Mainz)

22/01/2018, 17:30

Nuclear Structure and Astrophysics

Poster

The electromagnetic form factors of light nuclei provide a sensitive test of our understanding of nuclei. The deuteron in particular, as the only bound two-nucleon system, is a fundamental system that has received extensive attention in the past, by both theory and experiment. Because the deuteron has spin one, three form factors are needed to fully describe the electromagnetic structure of...

14. Decays of Vector Glueball in a Chiral Approach

Ms Julia Sammet (Goethe University Frankfurt)

22/01/2018, 17:33

Hadron Physics

Poster

We calculate two- and three-body decays of the (lightest) vector glueball into (pseudo)scalar, (axial-)vector, as well as pseudovector and excited vector mesons in the framework of an effective model of QCD. While absolute values of widths cannot be predicted because the corresponding coupling constants are unknown, some interesting branching ratios can be evaluated by setting the mass of...

59. The Crystal Zero Degree Detector at BESIII

Mr Leonard Koch (JLU Giessen)

22/01/2018, 17:36

Applications and Instrumentations

Poster

The BESIII experiment at the BEPCII electron positron collider at IHEP (Beijing) is collecting data in the charm-$\tau$ mass region. In electron positron collisions one of the initial leptons may emit a real photon before the annihilation (initial state radiation, ISR). As a result, the remaining system is boosted and has an effective center-of-mass energy lower than the nominal one...

80. The A1 - Jet-Target-Project

Stephan Aulenbacher (JGU Mainz)

22/01/2018, 17:39

Applications and Instrumentations

Poster

In the Year 2017 a new target has been installed @A1 in Mainz. This target is a Cluster-Jet-Target, which means that a hydrogen jet streams through the vacuum chamber, perpendicular to Mamis electron beam. By cooling down to gas temperatures of 40 K, the gas jet gets high densities in the core, due to the formation of clusters. The Jet-Target enables high precision measurements due to its...

25. The latest developments in preparations of the LHC community for the computing challenges of the High Luminosity LHC

Dr Dagmar Adamova (Nuclear Physics Institute AS CR)

22/01/2018, 17:42

Applications and Instrumentations

Poster

After the LHC community successfully completed Run 1, the capacity of the Worldwide LHC Computing Grid (WLCG) became the limiting factor in the processing of ever growing volumes of data produced from LHC collisions. During the last five years the LHC community launched a number of activities to increase computing performance and optimize usage of available resources. These activities are...

34. Complex Langevin simulations of a finite density matrix model for QCD

Dr Savvas Zafeiropoulos (Universitaet Heidelberg)

22/01/2018, 17:45

Poster

We study the Stephanov model, which is a Random Matrix Theory model for QCD at finite baryon density, using the Complex Langevin algorithm. Naive implementation of the algorithm shows convergence towards the phase quenched or quenched theory rather than to the intended theory with dynamical quarks. A detailed analysis of this issue various potential resolutions of the failure of this...

8. Production of neutron-rich nuclei approaching r-process by 238U photofission at ELI-NP

Dr Bo Mei (Extreme Light Infrastructure - Nuclear Physics (ELI-NP))

22/01/2018, 17:51

Nuclear Structure and Astrophysics

Poster

The investigation of very neutron-rich nuclei are of significant importance for nuclear physics and nuclear astrophysics. However, so far, only few neutron-rich nuclei near the stability have been measured, while most neutron-rich nuclei have not been experimentally studied due to their small production cross sections and short half-lives. Very brilliant and intense gamma beams planned at...