Wed·Feb 17, 2021Wednesday·February 17, 2021

1. 01*

   Measurement of average cross sections and isomeric ratios for natRe({\gamma},xn) photonuclear reactions at the end-point bremsstrahlung energies of 30 MeV and 40 MeV

   A.E. Avetisyan · R.V. Avetisyan · A.G. Barseghyan · R.K. Dallakyan · Yu.A. Gharibyan · A.V. Gyurjinyan · I.A. Kerobyan · H.A. Mkrtchyan🇦🇲

   The cross sections for ({\gamma},xn) reactions at 30 MeV and 40 MeV bremsstrahlung end-point energies on natural rhenium (natRe) targets have been measured by the activation and the off-line {\gamma}-ray spectrometric techniques using a High Purity Germanium detector (HPGe). The measured natRe({\gamma},xn) reaction cross sections were compared to the theoretically calculated cross sections using TALYS 1.9 and EMPIRE 3.2 computer codes. The measurements allowed the determination of the Isomeric Cross section Ratios (ICR) for the 184m,g Re and 182m,gRe isomeric pairs. In addition, we have determined a semi-empirical value for the 186m,gRe isomeric pair. These results for the 30 MeV and 40 MeV end-point bremsstrahlung energies are obtained for the first time.

   nucl-exNucl.Instrum.Meth.B(2021)·1 citation
2. 02*

   EIC Physics from An All-Silicon Tracking Detector

   John Arrington🇺🇸 · Reynier Cruz-Torres🇺🇸 · Winston DeGraw🇺🇸 · Xin Dong🇺🇸 · Leo Greiner🇺🇸 · Samuel Heppelmann🇺🇸 · Barbara Jacak🇺🇸 · Yuanjing Ji🇺🇸 · Matthew Kelsey🇺🇸 · Spencer R. Klein🇺🇸 · Yue Shi Lai🇺🇸 · Grazyna Odyniec🇺🇸 and 8 other authors

   The proposed electron-ion collider has a rich physics program to study the internal structure of protons and heavy nuclei. This program will impose strict requirements on detector design. This paper explores how these requirements can be satisfied using an all-silicon tracking detector, by consideration of three representative probes: heavy flavor hadrons, jets, and exclusive vector mesons.

   nucl-exnucl-th22 citations
3. 03*

   Proton mass decomposition: naturalness and interpretations

   Xiangdong Ji🇺🇸

   I discuss the scope and naturalness of the proton mass decomposition (or sum rule) published in PRL74, 1071 (1995) and answer a few criticisms that appeared recently in the literature, focusing particularly on its interpretation and the quantum anomalous energy contribution. I comment on the so-called frame-independent or invariant-mass decomposition from the trace of the energy-momentum tensor. I stress the importance of measuring the quantum anomalous energy through experiments. Finally, I point out a large discrepancy in the scalar radius of the nucleon extracted from vector-meson productions and lattice QCD calculations.

   ↳ hep-phhep-latnucl-exnucl-thFront.Phys.(Beijing)(2021)·104 citations
4. 04*

   Rapidity dependence of heavy-flavour production in heavy-ion collisions within a full 3+1 transport approach: quenching, elliptic and directed flow

   Andrea Beraudo🇮🇹 · Arturo De Pace🇮🇹 · Marco Monteno🇮🇹 · Marzia Nardi🇮🇹 · Francesco Prino🇮🇹

   We extend our POWLANG transport setup for the modelling of heavy-flavour production in heavy-ion collisions to the case of full 3+1 simulations, dropping the approximation of longitudinal boost-invariance of the background medium. This enables us to provide predictions for observables for which the rapidity dependence is essential in order to obtain a non-vanishing signal, like the directed flow $v_1$, and to get reliable results also for kinematic distributions of heavy-flavour particles at forward rapidity. We compare our predictions with experimental data obtained in Au-Au and Pb-Pb collisions at RHIC and at the LHC.

   ↳ hep-phnucl-exnucl-thJHEP(2021)·32 citations
5. 05*

   Accessing the shape of atomic nuclei with relativistic collisions of isobars

   Giuliano Giacalone🇩🇪 · Jiangyong Jia🇺🇸 · Vittorio Somà🇫🇷

   Nuclides sharing the same mass number (isobars) are observed ubiquitously along the stability line. While having nearly identical radii, stable isobars can differ in shape, and present in particular different quadrupole deformations. We show that even small differences in these deformations can be probed by relativistic nuclear collisions experiments, where they manifest as deviations from unity in the ratios of elliptic flow coefficients taken between isobaric systems. Collider experiments with isobars represent, thus, a unique means to obtain quantitative information about the geometric shape of atomic nuclei.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2021)·52 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.