Wed·Jun 15, 2016Wednesday·June 15, 2016

1. 01*

   Production of deuterium, tritium, and ${}^3$He in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV at the CERN SPS

   NA49 Collaboration: T. Anticic🇭🇷 · B. Baatar🇷🇺 · J. Bartke🇵🇱 · H. Beck🇩🇪 · L. Betev🇨🇭 · H. Białkowska🇵🇱 · C. Blume🇩🇪 · B. Boimska🇵🇱 · J. Book🇩🇪 · M. Botje🇳🇱 · P. Bunčić🇨🇭 · P. Christakoglou🇳🇱 and 53 other authors

   Production of $d$, $t$, and ${}^3$He nuclei in central Pb+Pb interactions was studied at five collision energies ($\sqrt{s_{NN}}=$ 6.3, 7.6, 8.8, 12.3, and 17.3 GeV) with the NA49 detector at the CERN SPS. Transverse momentum spectra, rapidity distributions, and particle ratios were measured. Yields are compared to predictions of statistical models. Phase-space distributions of light nuclei are discussed and compared to those of protons in the context of a coalescence approach. The coalescence parameters $B_2$ and $B_3$, as well as coalescence radii for $d$ and ${}^3$He were determined as a function of transverse mass at all energies.

   nucl-exPRC(2016)·110 citations
2. 02*

   Considerations about Chopper Configuration at a time-of-flight SANS Instrument at a Spallation Source

   Sebastian Jaksch

   In any neutron scattering experiment the measurement of the position of the scattered neutrons and their respective velocities is necessary. In order to do so, a position sensitive detector as well as a way to determine the velocities is needed. Measuring the velocities can either be done by using only a single wavelength and therefore velocity or by creating pulses, where the start and end time of each pulse is known and registering the time of arrival at the detector, which is the case we want to consider here. This pulse shaping process in neutron scattering instruments is usually done by using a configuration of several choppers. This set of choppers is then used to define both the beginning and the end of the pulse. Additionally there is of course also a selection in phase space determining the final resolution that can be achieved by the instrument. Taking into account the special requirements of a specific instrument, here a small-angle neutron scattering instrument, creates an additional set of restrictions that have to be taken into account. In this manuscript a chopper configuration for two possible settings, namely a maximum flux and a high-resolution mode will be presented.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2016)·2 citations
3. 03*

   Performance studies of MRPC prototypes for CBM

   I. Deppner🇩🇪 · N. Herrmann🇩🇪 · J. Frühauf🇩🇪 · M. Kiš🇩🇪 · P. Lyu🇨🇳 · P.-A. Loizeau🇩🇪 · L. Shi · C. Simon🇩🇪 · Y. Wang🇨🇳 · B. Xie

   Multi-gap Resistive Plate Chambers (MRPCs) with multi-strip readout are considered to be the optimal detector candidate for the Time-of-Flight (ToF) wall in the Compressed Baryonic Matter (CBM) experiment. In the R&D phase MRPCs with different granularities, low-resistive materials and high voltage stack configurations were developed and tested. Here, we focus on two prototypes called HD-P2 and THU-strip, both with strips of 27 cm${}^2$ length and low-resistive glass electrodes. The HD-P2 prototype has a single-stack configuration with 8 gaps while the THU-strip prototype is constructed in a double-stack configuration with 2 $\times$ 4 gaps. The performance results of these counters in terms of efficiency and time resolution carried out in a test beam time with heavy-ion beam at GSI in 2014 are presented in this proceeding.

   ↳ physics.ins-detnucl-exJINST(2016)·5 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.