Nuclear Experiment
New submissions
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New submissions for Fri, 27 Mar 20
 [1] arXiv:2003.11572 [pdf, ps, other]

Title: Structure of highlying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $β$ decayAuthors: K.R. Mashtakov, V.Yu. Ponomarev, M. Scheck, S.W. Finch, J. Isaak, M. Zweidinger, O. Agar, C. Bathia, T. Beck, J. Beller, M. Bowry, R. Chapman, M.M.R. Chisthi, U. FrimanGayer, L.P. Gaffney, P.E. Garrett, E.T. Gregor, J.M. Keatings, U. Köster, B. Löher, A.D. McLean, D. O'Donnell, H. Pai, N. Pietralla, G. Rainovski, M. Ramdhane, C. Romig, G. Rusev, D. Savran, G.S. Simpson, J. Sinclair, K. Sonnabend, P. Spagnoletti, A.P. Tonchev, W. TornowSubjects: Nuclear Experiment (nuclex)
The nature of $J^{\pi}=1^$ levels of $^{96}$Zr below the $\beta$decay $Q_{\beta}$ value of $^{96}$Y has been investigated in highresolution $\gamma$ray spectroscopy following the $\beta$ decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from $\beta$ decay allow the absolute $E1$ excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of $1^$ levels below the $Q_{\beta}$ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of highlying levels in the $^{96}$Y$_{gs}$ $\beta$ decay, one of the three most important contributors to the highenergy reactor antineutrino spectrum.
Crosslists for Fri, 27 Mar 20
 [2] arXiv:2003.11264 (crosslist from hepph) [pdf, other]

Title: Joint lattice QCD  dispersion theory analysis confirms the toprow CKM unitarity deficitComments: 6 pages, 5 figures, 1 tableSubjects: High Energy Physics  Phenomenology (hepph); High Energy Physics  Experiment (hepex); High Energy Physics  Lattice (heplat); Nuclear Experiment (nuclex); Nuclear Theory (nuclth)
Recently, the first ever lattice computation of the $\gamma W$box radiative correction to the rate of the semileptonic pion decay allowed for a reduction of the theory uncertainty of that rate by a factor of $\sim3$. A recent dispersion evaluation of the $\gamma W$box correction on the neutron also led to a significant reduction of the theory uncertainty, but shifted the value of $V_{ud}$ extracted from the neutron and superallowed nuclear $\beta$ decay, resulting in a deficit of the CKM unitarity in the top row. A direct lattice computation of the $\gamma W$box correction for the neutron decay would provide an independent crosscheck for this result but is very challenging. Before those challenges are overcome, we propose a hybrid analysis, converting the lattice calculation on the pion to that on the neutron by a combination of dispersion theory and phenomenological input. The new prediction for the universal radiative correction to free and bound neutron $\beta$decay reads $\Delta_R^V=0.02477(24)$, in excellent agreement with the dispersion theory result $\Delta_R^V=0.02467(22)$. Combining with other relevant information, the toprow CKM unitarity deficit persists.
 [3] arXiv:2003.11321 (crosslist from nuclth) [pdf, other]

Title: Selfconsistent Green's function theory for atomic nucleiAuthors: Vittorio SomàComments: 31 pages, 10 figures, submitted to 'Frontiers in Physics'Subjects: Nuclear Theory (nuclth); Nuclear Experiment (nuclex); Chemical Physics (physics.chemph)
Nuclear structure theory has recently gone through a major renewal with the development of ab initio techniques that can be applied to a large number of atomic nuclei, well beyond the light sector that had been traditionally targeted in the past. Selfconsistent Green's function theory is one among these techniques. The present work aims to give an overview of the selfconsistent Green's function approach for atomic nuclei, including examples of recent applications and a discussion on the perspectives for extending the method to nuclear reactions, doubly openshell systems and heavy nuclei.
 [4] arXiv:2003.11510 (crosslist from physics.insdet) [pdf, other]

Title: Coherent Elastic NeutrinoNucleus Scattering with directional detectorsComments: 14 pages, 11 figuresSubjects: Instrumentation and Detectors (physics.insdet); High Energy Physics  Experiment (hepex); High Energy Physics  Phenomenology (hepph); Nuclear Experiment (nuclex); Nuclear Theory (nuclth)
We study the sensitivity of detectors with directional sensitivity to coherent elastic neutrinonucleus scattering (CE$\nu$NS), and how these detectors complement measurements of the nuclear recoil energy. We consider stopped pion and reactor neutrino sources, and use gaseous helium and fluorine as examples of detector material. We generate Standard Model predictions, and compare to scenarios that include new, light vector or scalar mediators. We show that directional detectors can provide valuable additional information in discerning new physics, and we identify prominent spectral features in both the angular and the recoil energy spectrum for light mediators, even for nuclear recoil energy thresholds as high as $\sim 50$ keV. Combined with energy and timing information, directional information can play an important role in extracting new physics from CE$\nu$NS experiments.
 [5] arXiv:2003.11655 (crosslist from hepph) [pdf, other]

Title: Nucleon elastic form factors at accessible large spacelike momentaAuthors: ZhuFang Cui, Chen Chen, Daniele Binosi, Feliciano De Soto, Craig D. Roberts, Jose RodriguezQuintero, Sebastian M. Schmidt, Jorge SegoviaComments: 14 pages, 9 figures, 1 tableSubjects: High Energy Physics  Phenomenology (hepph); High Energy Physics  Lattice (heplat); Nuclear Experiment (nuclex); Nuclear Theory (nuclth)
A Poincar\'ecovariant quark+diquark Faddeev equation is used to compute nucleon elastic form factors on $0\leq Q^2\leq 18 \,m_N^2$ ($m_N$ is the nucleon mass) and elucidate their role as probes of emergent hadronic mass in the Standard Model. The calculations expose features of the form factors that can be tested in new generation experiments at existing facilities, e.g. a zero in $G_E^p/G_M^p$; a maximum in $G_E^n/G_M^n$; and a zero in the proton's $d$quark Dirac form factor, $F_1^d$. Additionally, examination of the associated lightfronttransverse number and anomalous magnetisation densities reveals, inter alia: a marked excess of valence $u$quarks in the neighbourhood of the proton's centre of transverse momentum; and that the valence $d$quark is markedly more active magnetically than either of the valence $u$quarks. The calculations and analysis also reveal other aspects of nucleon structure that could be tested with a highluminosity accelerator capable of delivering higher beam energies than are currently available.
 [6] arXiv:2003.11728 (crosslist from physics.dataan) [pdf, other]

Title: A Comprehensive Monte Carlo Framework for JetQuenchingAuthors: R.A. SoltzComments: 8 pages, 8 figures, contribution to the Quark Matter 2019 proceedingsSubjects: Data Analysis, Statistics and Probability (physics.dataan); Nuclear Experiment (nuclex); Nuclear Theory (nuclth)
This article presents the motivation for developing a comprehensive modeling framework in which different models and parameter inputs can be compared and evaluated for a large range of jetquenching observables measured in relativistic heavyion collisions at RHIC and the LHC. The concept of a framework us discussed within the context of recent efforts by the JET Collaboration, the authors of JEWEL, and the JETSCAPE collaborations. The framework ingredients for each of these approaches is presented with a sample of important results from each. The role of advanced statistical tools in comparing models to data is also discussed, along with the need for a more detailed accounting of correlated errors in experimental results.
 [7] arXiv:2003.11836 (crosslist from hepph) [pdf, other]

Title: Searching for New Physics in TwoNeutrino Double Beta DecayComments: 28 pages, 6 figures, including appendixSubjects: High Energy Physics  Phenomenology (hepph); Nuclear Experiment (nuclex); Nuclear Theory (nuclth)
Motivated by nonzero neutrino masses and the possibility of New Physics discovery, a number of experiments search for neutrinoless double beta decay. While hunting for this hypothetical nuclear process, a significant amount of twoneutrino double beta decay data has become available. Although these events are regarded and studied mostly as the background of neutrinoless double beta decay, they can be also used to probe physics beyond the Standard Model. In this paper we show how the presence of righthanded leptonic currents would affect the energy distribution and angular correlation of the outgoing electrons in twoneutrino double beta decay. Consequently, we estimate constraints imposed by currently available data on the existence of righthanded neutrino interactions without having to assume their nature. In this way our results complement the bounds coming from the nonobservation of neutrinoless double beta decay as they limit also the exotic interactions of Dirac neutrinos. We perform a detailed calculation of twoneutrino double beta decay under the presence of exotic (axial)vector currents and we demonstrate that current experimental searches can be competitive to existing limits.
Replacements for Fri, 27 Mar 20
 [8] arXiv:1908.07113 (replaced) [pdf, other]

Title: Neutrino Detectors as Tools for Nuclear SecurityAuthors: Adam Bernstein, Nathaniel Bowden, Bethany L. Goldblum, Patrick Huber, Igor Jovanovic, John MattinglyComments: 22 pages, 5 figures, published versionJournalref: Rev. Mod. Phys. 92 (2020) no.1, 011003Subjects: Physics and Society (physics.socph); High Energy Physics  Experiment (hepex); High Energy Physics  Phenomenology (hepph); Nuclear Experiment (nuclex); Instrumentation and Detectors (physics.insdet)
 [9] arXiv:1909.03158 (replaced) [pdf, other]

Title: Studies of J/$ψ$ production at forward rapidity in PbPb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeVAuthors: ALICE CollaborationComments: 27 pages, 9 captioned figures, 1 table, authors from page 22, submitted to JHEP, figures atJournalref: JHEP 2002 (2020) 041Subjects: Nuclear Experiment (nuclex); High Energy Physics  Experiment (hepex)
 [10] arXiv:1909.12261 (replaced) [pdf, other]

Title: Catching a glimpse of the parton structure of the bound protonComments: 6 pages, 4 figures; minor corrections; references added. Version accepted for publication in Phys. Rev. D, Rapid CommunicationsSubjects: Nuclear Theory (nuclth); High Energy Physics  Phenomenology (hepph); Nuclear Experiment (nuclex)
 [11] arXiv:1911.00456 (replaced) [pdf, ps, other]

Title: Charmed hadron chemistry in relativistic heavyion collisionsAuthors: Shanshan Cao, KaiJia Sun, ShuQing Li, Shuai Y.F. Liu, WenJing Xing, GuangYou Qin, CheMing KoComments: 6 pages, 5 figuresSubjects: Nuclear Theory (nuclth); High Energy Physics  Phenomenology (hepph); Nuclear Experiment (nuclex)
 [12] arXiv:2001.04256 (replaced) [pdf, other]

Title: Probing impactparameter dependent nuclear parton densities from double parton scatterings in heavyion collisionsAuthors: HuaSheng ShaoComments: 12 pages, 3 figures, 4 tables; v2: journal version (add a new appendix and references)Journalref: Phys. Rev. D 101, 054036 (2020)Subjects: High Energy Physics  Phenomenology (hepph); High Energy Physics  Experiment (hepex); Nuclear Experiment (nuclex); Nuclear Theory (nuclth)
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