Fri·Oct 23, 2020Friday·October 23, 2020

1. 01*

   Large-size sub-keV sensitive germanium detectors for the CONUS experiment

   H. Bonet (1)🇩🇪 · A. Bonhomme (1)🇩🇪 · C. Buck (1)🇩🇪 · K. Fülber (2)🇩🇪 · J. Hakenmüller (1)🇩🇪 · G. Heusser (1)🇩🇪 · T. Hugle (1)🇩🇪 · J.B. Legras (3)🇫🇷 · M. Lindner (1)🇩🇪 · W. Maneschg (1)🇩🇪 · V. Marian (3)🇫🇷 · T. Rink (1)🇩🇪 and 3 other authors

   Intense fluxes of reactor antineutrinos offer a unique possibility to probe the fully coherent character of elastic neutrino scattering off atomic nuclei. In this regard, detectors face the challenge to register tiny recoil energies of a few keV at the maximum. The CONUS experiment was installed in 17.1 m distance from the reactor core of the nuclear power plant in Brokdorf, Germany, and was designed to detect this neutrino interaction channel by using four 1 kg-sized point contact germanium detectors with sub-keV energy thresholds. This report describes the unique specifications addressed to the design, the research and development, and the final production of these detectors. It demonstrates their excellent electronic performance obtained during commissioning under laboratory conditions as well as during the first two years of operation at the reactor site which started on April 1, 2018. It highlights the long-term stability of different detector parameters and the achieved background levels of the germanium detectors inside the CONUS shield setup.

   ↳ physics.ins-detastro-ph.IMnucl-exEPJC(2021)·35 citations
2. 02*

   Development of a ${}^{83\mathrm{m}}$Kr source for the calibration of the CENNS-10 Liquid Argon Detector

   COHERENT Collaboration: D. Akimov · P. An · C. Awe · P. S. Barbeau · B. Becker · V. Belov · I. Bernardi · M. A. Blackston · L. Blokland · A. Bolozdynya · B. Cabrera-Palmer · N. Chen and 67 other authors

   We report on the preparation of and calibration measurements with a ${}^{83\mathrm{m}}$Kr source for the CENNS-10 liquid argon detector. ${}^{83\mathrm{m}}$Kr atoms generated in the decay of a ${}^{83}$Rb source were introduced into the detector via injection into the Ar circulation loop. Scintillation light arising from the 9.4 keV and 32.1 keV conversion electrons in the decay of ${}^{83\mathrm{m}}$Kr in the detector volume were then observed. This calibration source allows the characterization of the low-energy response of the CENNS-10 detector and is applicable to other low-energy-threshold detectors. The energy resolution of the detector was measured to be 9$\%$ at the total ${}^{83\mathrm{m}}$Kr decay energy of 41.5 keV. We performed an analysis to separately calibrate the detector using the two conversion electrons at 9.4 keV and 32.1 keV

   ↳ physics.ins-dethep-exnucl-exJINST(2021)·6 citations
3. 03*

   Searching signature of neutrino-nucleus coherent scattering with Mössbauer Spectroscopy

   C Marques🇧🇷 · G S Dias🇧🇷 · H S Chavez · S B Duarte🇧🇷

   The Mössbauer spectroscopy is presented as an alternative experimental technique to be pursued in the detec-tion of Coherent Elastic{\nu}-Nucleus Scattering (CENNS). The neutrino transferred energy in the neutrino-nucleusinteraction causes a perturbation at the nuclear levels which are responsible for gamma radiation in Mössbauerresonance. The main characteristic of Mössbauer spectroscopy is the recoil less condition imposed on the nucleiimposed by quantum restrictions of the crystalline array potential. Coherent neutrino scattering is expected tooccurs low energy regime of the beam, typically below 30 MeV, at higher neutrino energies small incoherencecomponent appears in the scattering[30] as disturbances within the internal nuclear degrees of freedom. Inthis work we have shown that using anti neutrino reactor beam, with the accuracy of Mössbauer technique itspossible to obtain a measurable signature of the Coherent neutrino Scattering.

   ↳ hep-phnucl-ex0 citations
4. 04*

   Effective shear and bulk viscosities for anisotropic flow

   Fernando G. Gardim🇧🇷 · Jean-Yves Ollitrault🇫🇷

   We evaluate the viscous damping of anisotropic flow in heavy-ion collisions for arbitrary temperature-dependent shear and bulk viscosities. We show that the damping is solely determined by effective shear and bulk viscosities, which are weighted averages over the temperature. We determine the relevant weights for nucleus-nucleus collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and 200 GeV, corresponding to the maximum LHC and RHIC energies, by running ideal and viscous hydrodynamic simulations. The effective shear viscosity is driven by temperatures below $210$ MeV at RHIC, and below $280$ MeV at the LHC, with the largest contributions coming from the lowest temperatures, just above freeze-out. The effective bulk viscosity is driven by somewhat higher temperatures, corresponding to earlier stages of the collision. We show that at a fixed collision energy, the effective viscosity is independent of centrality and system size, to the same extent as the mean transverse momentum of outgoing hadrons. The variation of viscous damping is determined by Reynolds number scaling.

   ↳ nucl-thhep-phnucl-exPRC(2021)·23 citations
5. 05*

   The Multiplicity Dependence of Pion Interferometry in Hydrodynamics

   Christopher Plumberg🇺🇸

   Understanding the origins of collective, fluid-like behavior in ultrarelativistic nuclear collisions constitutes one of the biggest open challenges in the field. In this Letter, it is argued that certain features in the multiplicity dependence of the source sizes extracted using pion interferometry may be understood quite naturally if small systems evolve hydrodynamically at sufficiently large multiplicities. Interferometry may therefore provide a baseline for probing and constraining the nature of collective behavior in nuclear collisions.

   ↳ nucl-thnucl-ex4 citations
6. 06*

   A New Beam Polarimeter at COSY to Search for Electric Dipole Moments of Charged Particles

   F. Müller🇩🇪 · O. Javakhishvili🇩🇪 · D. Shergelashvili🇬🇪 · I. Keshelashvili🇩🇪 · D. Mchedlishvili🇬🇪 · F. Abusaif🇩🇪 · A. Aggarwal🇵🇱 · L. Barion🇮🇹 · S. Basile🇮🇹 · J. Böker🇩🇪 · N. Canale🇮🇹 · G. Ciullo🇮🇹 and 44 other authors

   A calorimetric polarimeter based on inorganic LYSO scintillators is described. It has been designed for use in a storage ring to search for electric dipole moments (EDM) of charged particles such as the proton and deuteron. Its development and first use was on the Cooler Synchrotron (COSY) at the Forschungszentrum Jülich with 0.97 GeV/c polarized deuterons, a particle and energy suitable for an EDM search. The search requires a polarimeter with high efficiency, large analyzing power, and stable operating characteristics. With typical beam momenta of about 1 GeV/c, the scattering of protons or deuterons from a carbon target into forward angles becomes a nearly optimal choice of an analyzing reaction. The polarimeter described here consists of 52 LYSO detector modules, arranged in 4 symmetric blocks (up, down, left, right) for energy determination behind plastic scintillators for particle identification via energy loss. The commissioning results of the current setup demonstrate that the polarimeter is ready to be employed in a first direct search for an EDM on the deuteron, which is planned at COSY in the next two years.

   ↳ physics.ins-dethep-exnucl-exJINST(2020)·13 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.