Thu·Sep 10, 2015Thursday·September 10, 2015

1. 01*

   Response of a proportional counter to ${}^{37}$Ar and ${}^{71}$Ge: measured spectra versus Geant4 simulation

   D.N Abdurashitov🇷🇺 · Yu.M Malyshkin🇷🇺 · V.L. Matushko🇷🇺 · B. Suerfu🇺🇸

   The energy deposition spectra of ${}^{37}$Ar and ${}^{71}$Ge in a miniature proportional counter are measured and compared in detail to the model response simulated with Geant4. A certain modification of the Geant4 code, making it possible to trace the deexcitation of atomic shells properly, is suggested. Modified Geant4 is able to reproduce a response of particle detectors in detail in the keV energy range. This feature is very important for the laboratory experiments that search for massive sterile neutrinos as well as for dark matter searches that employ direct detection of recoil nuclei. This work demonstrates the reliability of Geant4 simulation at low energies.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.B(2016)·3 citations
2. 02*

   Charmonium production at mid-rapidity in Pb-Pb and p-Pb collisions with ALICE

   Steffen Georg Weber (for the ALICE Collaboration)🇩🇪

   We present an overview of the ALICE measurements on the production of $J/\psi$ in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=2.76\mathrm{TeV}$ and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02\mathrm{TeV}$ at mid-rapidity ($|y_{\mathrm{lab}}|<0.8$) down to zero transverse momentum. The cold nuclear matter effects estimated from the p-Pb measurements and their impact on the interpretation of Pb-Pb results are discussed, based on comparison of data to model calculations.

   ↳ hep-exnucl-exJ.Phys.Conf.Ser.(2016)·3 citations
3. 03*

   Test of the CLAS12 RICH large scale prototype in the direct proximity focusing configuration

   N. Baltzell · L. Barion · F. Benmokhtar · W. Brooks · E. Cisbani · M. Contalbrigo · A. El Alaoui · K. Hafidi · M. Hoek · V. Kubarovsky · L. Lagamba · V. Lucherini and 16 other authors

   A large area ring-imaging Cherenkov detector has been designed to provide clean hadron identification capability in the momentum range from 3 GeV/c up to 8 GeV/c for the CLAS12 experiments at the upgraded 12 GeV continuous electron beam accelerator facility of Jefferson Laboratory. The adopted solution foresees a novel hybrid optics design based on aerogel radiator, composite mirrors and high-packed and high-segmented photon detectors. Cherenkov light will either be imaged directly (forward tracks) or after two mirror reflections (large angle tracks). We report here the results of the tests of a large scale prototype of the RICH detector performed with the hadron beam of the CERN T9 experimental hall for the direct detection configuration. The tests demonstrated that the proposed design provides the required pion-to-kaon rejection factor of 1:500 in the whole momentum range.

   ↳ physics.ins-detnucl-exEPJA(2016)·11 citations
4. 04*

   Peculiarities of neutron waveguides with thin Gd layer

   Yu. Khaydukov · E. Kravtsov · V. Progliado · V. Ustinov · Yu. Nikitenko · T. Keller🇩🇪 · V. Aksenov · B. Keimer

   Peculiarities of the formation of a neutron enhanced standing wave in the structure with a thin highly absorbing layer of gadolinium are considered in the article. An analogue of the poisoning effect well known in reactor physics was found. The effect is stronger for the Nb/Gd/Nb system. Despite of this effect, for a Nb/Gd bilayer and a Nb/Gd/Nb trilayer placed between Al2O3 substrate and Cu layer, it is shown theoretically and experimentally that one order of magnitude enhancement of neutron density is possible in the vicinity of the Gd layer. This enhancement makes it possible to study domain formation in the Gd layer under transition of the Nb layer(s) into the superconducting state (cryptoferromagnetic phase).

   ↳ physics.ins-detnucl-exJ.Phys.Conf.Ser.(2016)·0 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.