Thu·Nov 17, 2016Thursday·November 17, 2016

1. 01*

   Rearrangement of valence neutrons in the neutrinoless double-$\beta$ decay of ${}^{136}$Xe

   S. V. Szwec🇬🇧 · B. P. Kay🇺🇸 · T. E. Cocolios🇬🇧 · J. P. Entwisle🇬🇧 · S. J. Freeman🇬🇧 · L. P. Gaffney🇬🇧 · V. Guimarães🇧🇷 · F. Hammache🇫🇷 · P. P. McKee🇬🇧 · E. Parr🇬🇧 · C. Portail🇫🇷 · J. P. Schiffer🇺🇸 and 4 other authors

   A quantitative description of the change in ground-state neutron occupancies between ${}^{136}$Xe and ${}^{136}$Ba, the initial and final state in the neutrinoless double-$\beta$ decay of ${}^{136}$Xe, has been extracted from precision measurements of the cross sections of single-neutron adding and -removing reactions. Comparisons are made to recent theoretical calculations of the same properties using various nuclear-structure models. These are the same calculations used to determine the magnitude of the nuclear matrix elements for the process, which at present disagree with each other by factors of 2 or 3. The experimental neutron occupancies show some disagreement with the theoretical calculations.

   nucl-exnucl-thPRC(2016)·30 citations
2. 02*

   Ultra-peripheral Collisions with the ATLAS Detector

   Miguel Arratia (for the ATLAS collaboration)🇬🇧

   The first ATLAS measurement of ultra-peripheral collisions is described. Dimuon pairs from photon--photon scattering have been measured with data of Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV taken with the ATLAS detector at the LHC. The measured cross-section is presented as a function of dimuon invariant mass and rapidity and is well described by STARLIGHT 1.1 calculations. This measurement paves the way for new studies of photon-induced reactions at the LHC.

   nucl-exhep-exAIP Conf.Proc.(2017)·3 citations
3. 03*

   Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments

   A. Steyerl · K.K.H. Leung🇫🇷 · C. Kaufman · G. Müller🇩🇪 · S.S. Malik

   We analyze the spin flip loss for ultracold neutrons in magnetic bottles of the type used in experiments aiming at a precise measurement of the neutron lifetime, extending the one-dimensional field model used previously by Steyerl $\text{et al.}$ [Phys.Rev.C $86$, 065501 (2012)] to two dimensions for cylindrical multipole fields. We also develop a general analysis applicable to three dimensions. Here we apply it to multipole fields and to the bowl-type field configuration used for the Los Alamos UCN$\tau$ experiment. In all cases considered the spin flip loss calculated exceeds the Majorana estimate by many orders of magnitude but can be suppressed sufficiently by applying a holding field of appropriate magnitude to allow high-precision neutron lifetime measurements, provided other possible sources of systematic error are under control.

   ↳ physics.ins-detnucl-exPRC(2017)·12 citations
4. 04*

   Investigating the NCQ scaling of elliptic flow at LHC with a multiphase transport model

   Liang Zheng🇨🇳 · Hui Li🇨🇳 · Hong Qin🇨🇳 · Qi-Ye Shou🇨🇳 · Zhong-Bao Yin🇨🇳

   The number of constituent quark (NCQ) scaling behavior of elliptic flow has been systematically studied at the LHC energy within the framework of a multiphase transport model (AMPT) in this work. We find that the parameters used to generate the initial states and the collision centrality are important for the existence of NCQ scaling even when hadronic rescattering contribution is off in Pb-Pb collisions of $\sqrt{s_{NN}}=2.76$ TeV. By turning on the hadron rescattering process, the hadronic evolution impacts are also found to be significant. Extending the analysis to Pb-Pb collsions of $\sqrt{s_{NN}}=5.02$ TeV, one would observe similar qualitative features.

   ↳ nucl-thnucl-exEPJA(2017)·13 citations
5. 05*

   From gluon topology to chiral anomaly: Emergent phenomena in quark-gluon plasma

   Jinfeng Liao🇺🇸

   Heavy-ion collision experiments at RHIC and the LHC have found a new emergent phase of QCD, a strongly coupled quark-gluon plasma (sQGP) that is distinctively different from either the low temperature hadron phase or the very high temperature weakly coupled plasma phase. Highly nontrivial emergent phenomena occur in such sQGP and two examples will be discussed in this contribution: the magnetic component of sQGP that stems from topologically nontrivial configurations in the gluon sector; and the anomalous chiral transport that arises as macroscopic manifestation of microscopic chiral anomaly in the quark sector. For both examples, their important roles in explaining pertinent heavy-ion data will be emphasized.

   ↳ nucl-thhep-phhep-thnucl-exJ.Phys.Conf.Ser.(2017)·1 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.