Date: Wed, 25 Nov 20 01:36:35 GMT Subject: nucl-ex daily 1 new + 1 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-ex@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Mon 23 Nov 20 19:00:00 GMT to Tue 24 Nov 20 19:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:2011.12211 Date: Tue, 24 Nov 2020 17:02:40 GMT (1086kb,D) Title: Exclusive dimuon production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV with ATLAS Authors: ATLAS Collaboration Categories: nucl-ex hep-ex Comments: 50 pages in total, author list starting page 34, 12 figures, submitted to Phys. Rev. C. All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2016-02/ Report-no: CERN-EP-2020-138 \\ Exclusive dimuon production in ultraperipheral collisions (UPC), resulting from photon-photon interactions in the strong electromagnetic fields of colliding high-energy lead nuclei, $\mathrm{PbPb}(\gamma\gamma) \rightarrow \mu^+\mu^- (\mathrm{Pb}^{(\star)}\mathrm{Pb}^{(\star)} )$, is studied using $\mathcal{L}_{\mathrm{int}} = 0.48$ nb$^{-1}$ of $\sqrt{s_\mathrm{NN}}=5.02$ TeV lead-lead collision data at the LHC with the ATLAS detector. Dimuon pairs are measured in the fiducial region $p_{\mathrm{T}\mu} > 4$ GeV, $|\eta_{\mu}| < 2.4$, invariant mass $m_{\mu\mu} > 10$ GeV, and $p_{\mathrm{T,\mu\mu}} < 2$ GeV. The primary background from single-dissociative processes is extracted from the data using a template fitting technique. Differential cross sections are presented as a function of $m_{\mu\mu}$, absolute pair rapidity ($|y_{\mu\mu}|$), scattering angle in the dimuon rest frame ($|\cos \vartheta^{\star}_{\mu\mu}|$) and the colliding photon energies. The total cross section of the UPC $\gamma \gamma \rightarrow \mu^{+}\mu^{-}$ process in the fiducial volume is measured to be $\sigma_{\mathrm{fid}}^{\mu\mu} = 34.1 \! \pm \! 0.3 \mathrm{(stat.)} \! \pm \! 0.7 \mathrm{(syst.)}$ $\mu\mathrm{b}$. Generally good agreement is found with calculations from STARlight, which incorporate the leading-order Breit-Wheeler process with no final-state effects, albeit differences between the measurements and theoretical expectations are observed. In particular, the measured cross sections at larger $|y_{\mu\mu}|$ are found to be about 10-20% larger in data than in the calculations, suggesting the presence of larger fluxes of photons in the initial state. Modification of the dimuon cross sections in the presence of forward and/or backward neutron production is also studied and is found to be associated with a harder incoming photon spectrum, consistent with expectations. \\ ( https://arxiv.org/abs/2011.12211 , 1086kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:2011.11769 (*cross-listing*) Date: Mon, 23 Nov 2020 22:27:29 GMT (1145kb) Title: Performance of photosensors in high rate environment for gas Cherenkov Authors: Chao Peng, Junqi Xie, Sylvester Joosten, Zein-Eddine Meziani, Alexandre Camsonne, Mark Jones, Edward Kaczanowicz, Melanie Rehfuss, Nikolaos Sparveris, Michael Paolone, Michael Foley, Michael Minot, Mark Popecki Categories: physics.ins-det nucl-ex Comments: 16 pages, 11 figures \\ The upcoming SoLID experiment at Jefferson Lab will push the envelope on luminosity for a large-acceptance detector, requiring the use of a light-gas Cherenkov detector for trigger-level event selection. Due to the high luminosity environment, the single-photon background rate in this Cherenkov is expected to be extremely high at the photon sensor. Thus, it is essential to validate the planned photosensors and readout electronics to determine the limits of these sensors and mitigate the risk of failure of the trigger-level event selection. We report the design of a small prototype telescopic Cherenkov device and a set of early studies in a high-rate environment in Hall C at Jefferson Lab. Commercially available multi-anode photomultipliers (MaPMT) and low-cost large-area picosecond photodetectors (LAPPD) were tested with the JLab FADC250 modules for the data acquisition to assess their performance in such an environment. The experiment results show that both a MaPMT array and an internal stripline LAPPD could detect the Cherenkov signals and separate single-electron events and pair production events. A GEANT4 simulation confirms the experimental performance of the prototype results through direct comparison. With higher quantum efficiency, the MaPMT array provided a better separation of the single-electron events and pair production events than the internal stripline LAPPD. The experiment also demonstrated that the MaPMT array with a summed readout of 16 pixels per MaPMT, the LAPPD with internal stripline readout, and the FADC250 modules performed successfully at a single-photon rate up to 60 $kHz/cm^{2}$. \\ ( https://arxiv.org/abs/2011.11769 , 1145kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1904.13248 (*cross-listing*) replaced with revised version Tue, 24 Nov 2020 08:14:59 GMT (2467kb,D) Title: A new software implementation of the Oslo method with rigorous statistical uncertainty propagation Authors: J{\o}rgen E. Midtb{\o}, Fabio Zeiser, Erlend Lima, Ann-Cecilie Larsen, Gry M. Tveten, Magne Guttormsen, Frank Leonel Bello Garrote, Anders Kvellestad, Therese Renstr{\o}m Categories: physics.comp-ph nucl-ex Comments: 20 pages, 6 figures. Updated this version: Major revision of App. C \\ ( https://arxiv.org/abs/1904.13248 , 2467kb) ------------------------------------------------------------------------------ \\ arXiv:1910.06170 (*cross-listing*) replaced with revised version Tue, 24 Nov 2020 15:52:13 GMT (114kb,D) Title: Probing the neutron skin with ultrarelativistic isobaric collisions Authors: Hanlin Li, Hao-jie Xu, Ying Zhou, Xiaobao Wang, Jie Zhao, Lie-Wen Chen, Fuqiang Wang Categories: nucl-th nucl-ex Comments: 6 pages, 4 figures, published version Journal-ref: Phys. Rev. Lett. 125, 222301 (2020) DOI: 10.1103/PhysRevLett.125.222301 \\ ( https://arxiv.org/abs/1910.06170 , 114kb) ------------------------------------------------------------------------------ \\ arXiv:2008.06014 replaced with revised version Mon, 23 Nov 2020 20:20:06 GMT (4277kb,D) Title: The Majorana Demonstrator's Search for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se Authors: I.J. Arnquist, F.T. Avignone III, A.S. Barabash, C.J. Barton, F.E. Bertrand, E. Blalock, B. Bos, M. Busch, M. Buuck, T.S. Caldwell, Y-D. Chan, C.D. Christofferson, P.-H. Chu, M.L. Clark, C. Cuesta, J.A. Detwiler, A. Drobizhev, T.R. Edwards, D.W. Edwins, Yu. Efremenko, H. Ejiri, S.R. Elliott, T. Gilliss, G.K. Giovanetti, M.P. Green, J. Gruszko, I.S. Guinn, V.E. Guiseppe, C.R. Haufe, R. Henning, D. Hervas Aguilar, E.W. Hoppe, A. Hostiuc, M.F. Kidd, I. Kim, R.T. Kouzes, A.M. Lopez, J.M. L\'opez-Casta\~no, E.L. Martin, R.D. Martin, R. Massarczyk, S.J. Meijer, S. Mertens, J. Myslik, T.K. Oli, G. Othman, L.S. Paudel, W. Pettus, A.W.P. Poon, D.C. Radford, A.L. Reine, K. Rielage, N.W. Ruof, B. Sayk{\i}, M.J. Stortini, D. Tedeschi, R.L. Varner, S. Vasilyev, J.F. Wilkerson, C. Wiseman, W. Xu, C.-H. Yu, and B.X. Zhu Categories: nucl-ex Comments: 16 pages, 11 figures \\ ( https://arxiv.org/abs/2008.06014 , 4277kb) ------------------------------------------------------------------------------ \\ arXiv:2011.06265 replaced with revised version Tue, 24 Nov 2020 12:52:48 GMT (210kb,D) Title: Search for decays of the $^{9}$B nucleus and Hoyle state in $^{14}$N nucleus dissociation Authors: E. Mitsova, A.A. Zaitsev, D.A. Aretemenkov, N.K. Kornegrutsa, V.V. Rusakova, R. Stanoeva, P.I. Zarubin, I.G. Zarubina Categories: nucl-ex Comments: Article materials were presented in the report by A.A. Zaitsev at LXX International conference Nucleus - 2020, https://indico.cern.ch/event/839985/contributions/3985257 To be published in journal "Physics of Particles and Nuclei" \\ ( https://arxiv.org/abs/2011.06265 , 210kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arxiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arxiv.org/help/