Wed·Dec 20, 2017Wednesday·December 20, 2017

1. 01*

   Development of the (d,n) proton-transfer reaction in inverse kinematics for structure studies

   K.L. Jones🇺🇸 · C. Thornsberry🇺🇸 · J. Allen🇺🇸 · A. Atencio🇺🇸 · D.W. Bardayan🇺🇸 · D. Blankstein🇺🇸 · S. Burcher🇺🇸 · A.B. Carter🇺🇸 · K.A. Chipps🇺🇸 · J.A. Cizewski🇺🇸 · I. Cox🇺🇸 · Z. Elledge🇺🇸 and 18 other authors

   Transfer reactions have provided exciting opportunities to study the structure of exotic nuclei and are often used to inform studies relating to nucleosynthesis and applications. In order to benefit from these reactions and their application to rare ion beams (RIBs) it is necessary to develop the tools and techniques to perform and analyze the data from reactions performed in inverse kinematics, that is with targets of light nuclei and heavier beams. We are continuing to expand the transfer reaction toolbox in preparation for the next generation of facilities, such as the Facility for Rare Ion Beams (FRIB), which is scheduled for completion in 2022. An important step in this process is to perform the (d,n) reaction in inverse kinematics, with analyses that include Q-value spectra and differential cross sections. In this way, proton-transfer reactions can be placed on the same level as the more commonly used neutron-transfer reactions, such as (d,p), (9Be,8Be), and (13C,12C). Here we present an overview of the techniques used in (d,p) and (d,n), and some recent data from (d,n) reactions in inverse kinematics using stable beams of 12C and 16O.

   nucl-exActa Phys.Polon.B(2018)·0 citations
2. 02*

   Search for three-nucleon short-range correlations in light nuclei

   Z. Ye · P. Solvignon · D. Nguyen · P. Aguilera · Z. Ahmed · H. Albataineh · K. Allada · B. Anderson · D. Anez · K. Aniol · J. Annand · J. Arrington and 91 other authors

   We present new data probing short-range correlations (SRCs) in nuclei through the measurement of electron scattering off high-momentum nucleons in nuclei. The inclusive 4He/3He cross section ratio is observed to be both x and Q2 independent for 1.5 < x < 2, confirming the dominance of two- nucleon (2N) short-range correlations (SRCs). For x > 2, our data do not support a previous claim of three-nucleon (3N) correlation dominance. While contributions beyond those from stationary 2N- SRCs are observed, our data show that isolating 3N-SRCs is more complicated than for 2N-SRCs.

   nucl-exPRC(2018)·28 citations
3. 03*

   Gluon Shadowing in Heavy-Flavor Production at the LHC

   Aleksander Kusina🇵🇱 · Jean-Philippe Lansberg🇫🇷 · Ingo Schienbein🇫🇷 · Hua-Sheng Shao🇫🇷

   We study the relevance of experimental data on heavy-flavor [$D^0$, $J/\psi$, $B\to J/\psi$ and ${\rm Y}(1S)$ mesons] production in proton-lead collisions at the LHC to improve our knowledge of the gluon-momentum distribution inside heavy nuclei. We observe that the nuclear effects encoded in both most recent global fits of nuclear parton densities at next-to-leading order (nCTEQ15 and EPPS16) provide a good overall description of the LHC data. We interpret this as a hint that these are the dominant ones. In turn, we perform a Bayesian-reweighting analysis for each particle data sample which shows that each of the existing heavy-quark(onium) data set clearly points --with a minimal statistical significance of 7 $\sigma$-- to a shadowed gluon distribution at small $x$ in the lead. Moreover, our analysis corroborates the existence of gluon antishadowing. Overall, the inclusion of such heavy-flavor data in a global fit would significantly reduce the uncertainty on the gluon density down to $x\simeq 7\times 10^{-6}$ --where no other data exist-- while keeping an agreement with the other data of the global fits. Our study accounts for the factorization-scale uncertainties which dominate for the charm(onium) sector.

   ↳ hep-phhep-exnucl-exnucl-thPRL(2018)·170 citations
4. 04*

   Muon-neutrino-induced charged current cross section without pions: Theoretical analysis

   U. Mosel🇩🇪 · K. Gallmeister🇩🇪

   We calculate the charged current cross sections obtained at the T2K near detector for ${\nu }_{\mu }$-induced events without pions in the final state. The method used is quantum-kinetic transport theory. Results are shown first, as a benchmark, for electron inclusive cross sections on ${}^{12}$C and ${}^{16}$O to be followed with a detailed comparison with the data measured by the T2K collaboration on C${}_8$H${}_8$ and H${}_2$O targets. The contribution of 2p2h processes is found to be relevant mostly for backwards angles; their theoretical uncertainties are within the experimental uncertainties. Particular emphasis is then put on a discussion of events in which pions are first created, but then reabsorbed. Their contribution is found to be essential at forward angles.

   ↳ hep-exhep-phnucl-exnucl-thPRC(2018)·20 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.