Wed·Jan 5, 2022Wednesday·January 5, 2022

1. 01*

   Emergence of pion parton distributions

   Z.-F. Cui🇨🇳 · M. Ding🇩🇪 · J. M. Morgado🇪🇸 · K. Raya🇪🇸 · D. Binosi🇮🇹 · L. Chang🇨🇳 · F. De Soto🇪🇸 · C. D. Roberts🇨🇳 · J. Rodríguez-Quintero🇪🇸 · S. M. Schmidt🇩🇪

   Supposing only that there is an effective charge which defines an evolution scheme for parton distribution functions (DFs) that is all-orders exact, strict lower and upper bounds on all Mellin moments of the valence-quark DFs of pion-like systems are derived. Exploiting contemporary results from numerical simulations of lattice-regularised quantum chromodynamics (QCD) that are consistent with these bounds, parameter-free predictions for pion valence, glue, and sea DFs are obtained. The form of the valence-quark DF at large values of the light-front momentum fraction is consistent with predictions derived using the QCD-prescribed behaviour of the pion wave function.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2022)·51 citations
2. 02*

   Laser Driven Nuclear physics at ELINP

   F. Negoita🇷🇴 · M. Roth🇩🇪 · P.G. Thirolf🇩🇪 · S. Tudisco🇮🇹 · F. Hannachi🇫🇷 · S. Moustaizis🇬🇷 · I. Pomerantz🇮🇱 · P. Mckenna🇬🇧 · J. Fuchs🇫🇷 · K. Sphor🇬🇧 · G. Acbas🇷🇴 · A. Anzalone🇮🇹 and 44 other authors

   High power lasers have proven being capable to produce high energy gamma rays, charged particles and neutrons to induce all kinds of nuclear reactions. At ELI, the studies with high power lasers will enter for the first time into new domains of power and intensities.

   ↳ physics.ins-detnucl-ex7 citations
3. 03*

   Effects of neutron-skin thickness on direct hard photon emission from reactions induced by the neutron-rich projectile ${}^{50}$Ca

   S. S. Wang🇨🇳 · Y. G. Ma🇨🇳 · D. Q. Fang🇨🇳 · X. G. Cao🇨🇳

   Direct hard photon emissions from incoherent proton-neutron bremsstrahlung in collisions of the neutron-rich projectile ${}^{50}$Ca with ${}^{12}$C and ${}^{40}$Ca targets are simulated in the framework of the isospin-dependent quantum molecular dynamics (IQMD) model. By adjusting the diffuseness parameter of neutron density in the droplet model to obtain different neutron skin thicknesses for ${}^{50}$Ca, the effects of neutron skin thickness on direct hard photon emission are investigated via several probes. The results show that more direct hard photons are produced with increasing neutron skin thickness in peripheral collisions. Meanwhile, we find that the multiplicity yield ratio $R_{cp}({\sigma }_{\gamma })$ between central collisions and peripheral collisions as well as the rapidity dependence of multiplicity for direct hard photons are sensitive to neutron skin thickness. The results indicate that direct hard photon emission can be taken as an experimental observable to extract information on neutron skin thickness.

   ↳ nucl-thnucl-exPRC(2022)·8 citations
4. 04*

   Characteristics of a matrix proportional counter with circular anodes

   R.A. Etezov🇷🇺 · Yu.M. Gavrilyuk🇷🇺 · A.M. Gangapshev🇷🇺 · V.V. Kazalov🇷🇺 · A.Kh. Khokonov🇷🇺 · V.V. Kuzminov🇷🇺 · S.I. Panasenko🇺🇦 · S.S Ratkevich🇺🇦

   The construction of a butt-end multicell matrix proportional counter (MMPC) is presented in the work. Each cell is a butt-end proportional counter with a 5 mm cathode diameter and 0.8 mm circular anode diameter. In the example of the $3\times 3$ matrix, it is shown that the gas multiplication of the central cell depends on the potentials at the anodes of the peripheral cells, the drift electrode, the forming rings, and the surrounding metal parts of the structure. The amplitude characteristics were measured when the MMPC was filled with mixtures of 96.3\% Ar + 3.7\% Xe and 90\% Ar + 10\% CH${}_4$ at pressures of 620 Torr and 62 Torr. The calibration was carried out with $\alpha$-particles and $\gamma$-quanta from a ${}^{238}$Pu source. For photons with energies of 7.5 keV, a resolution of 26\% was obtained. It is shown that, based on MMPC, it is possible to fabricate recording surfaces of arbitrary configuration.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2023)·0 citations
5. 05*

   Fieldable Muon Momentum Measurement using Coupled Pressurized Gaseous Cherenkov Detectors

   Junghyun Bae🇺🇸 · Stylianos Chatzidakis🇺🇸

   Cosmic ray muons present a large part of the radiation background and depending on the application of interest muons can be seen as background noise, e.g., radiation mapping, radiation protection, dosimetry, or as a useful interrogation probe such as cosmic ray muon tomography. It is worth noting recent developments on muon scattering tomography which has emerged as a prospective noninvasive monitoring method for many applications including spent nuclear fuel cask monitoring and geotomography. However, it is still very challenging to measure muon momentum in the field, despite the apparent benefits, without resorting to large and expensive calorimeters, ring imagers, or time of flight detectors. Recent efforts at CNL and INFN have developed large prototypes based on multiple Coulomb scattering coupled with the muon momentum reconstruction algorithms. While these efforts show promise, no portable detectors exist that can measure muon momentum in the field. In this work, we present a new concept for measuring muon momentum using coupled pressurized gaseous Cherenkov radiators. By carefully selecting the gas pressure at each radiator we can optimize the muon momentum threshold for which a muon signal will be detected. This way, a muon passing through the radiators will only trigger those radiators with momentum threshold less than the actual muon momentum. By measuring the presence of Cherenkov signals in each radiator, our system can then estimate the muon momentum. The primary benefit of such a concept is that it can be compact and portable enough so that it can be deployed in the field separately or in combination with existing tomography systems.

   ↳ physics.ins-detastro-ph.IMhep-exnucl-ex1 citation

* 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.