Thu·Jan 12, 2017Thursday·January 12, 2017

1. 01*

   Parity Violation in Deep Inelastic Scattering with the SoLID Spectrometer at JLab

   Y. X. Zhao🇺🇸

   Measurements of parity-violating asymmetries in DIS region using the SoLID spectrometer at Jefferson Lab (JLab) Hall A in the 12 GeV era are presented. A proposal with a polarized electron beam on unpolarized deuteron and proton targets has been approved with an A rating by the JLab PAC. The deuteron measurement aims to measure the weak mixing angle ${\sin }^2{\theta }_W$ with a precision of $\pm$ 0.0006 as well as to access the fundamental coupling constants $C_{2q}$ with a high precision. This measurement is ideally suited for testing the Standard Model with the potential to probe charge symmetry violation and resolve the quark-quark correlations in the DIS region. The proton experiment provides a clean measurement of $d/u$ ratio in the high-$x$ region free of nuclear corrections. To achieve these goals, the SoLID spectrometer was proposed and designed to handle a high luminosity with a large acceptance. In this article, the details of the approved measurements are discussed, along with new ideas with PVDIS using a polarized ${}^3$He target to access new $\gamma -Z$ interference polarized structure functions and a unpolarized ${}^{48}$Ca target to study the EMC effect.

   nucl-ex8 citations
2. 02*

   ALICE mesurements of heavy-flavour production in pp and p-Pb collisions at the LHC

   Grazia Luparello · (for the ALICE Collaboration)

   The D meson yields as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}=7$ TeV and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV are presented. The measurement of the yields of electrons from heavy-flavour hadron decays as a function of charged-particle multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV are shown as well. The measurement of azimuthal correlations of prompt D mesons and charged hadrons in pp collisions at $\sqrt{s}=7$ TeV and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV are also presented. The results are compared with expectations from models.

   nucl-exNucl.Part.Phys.Proc.(2017)·0 citations
3. 03*

   First measurement of ${}^{30}$S+$\alpha$ resonant elastic scattering for the ${}^{30}$S($\alpha$,p) reaction rate

   D. Kahl🇯🇵 · H. Yamaguchi · S. Kubono🇨🇳 · A. A. Chen🇹🇼 · A. Parikh🇪🇸 · D. N. Binh🇯🇵 · J. Chen🇨🇳 · S. Cherubini🇮🇹 · N. N. Duy🇻🇳 · T. Hashimoto🇰🇷 · S. Hayakawa🇯🇵 · N. Iwasa🇯🇵 and 11 other authors

   Background: Type I x-ray bursts are the most frequent thermonuclear explosions in the galaxy, resulting from thermonuclear runaway on the surface of an accreting neutron star. The ${}^{30}$S($\alpha$,p) reaction plays a critical role in burst models, yet insufficient experimental information is available to calculate a reliable, precise rate for this reaction. Purpose: Our measurement was conducted to search for states in ${}^{34}$Ar and determine their quantum properties. In particular, natural-parity states with large $\alpha$-decay partial widths should dominate the stellar reaction rate. Method: We performed the first measurement of ${}^{30}$S+$\alpha$ resonant elastic scattering up to a center-of-mass energy of 5.5 MeV using a radioactive ion beam. The experiment utilized a thick gaseous active target system and silicon detector array in inverse kinematics. Results: We obtained an excitation function for ${}^{30}$S($\alpha$,$\alpha$) near $150^{\circ }$ in the center-of-mass frame. The experimental data were analyzed with an $R$-Matrix calculation, and we observed three new resonant patterns between 11.1 and 12.1 MeV, extracting their properties of resonance energy, widths, spin, and parity. Conclusions: We calculated the resonant thermonuclear reaction rate of ${}^{30}$S($\alpha$,p) based on all available experimental data of ${}^{34}$Ar and found an upper limit about one order of magnitude larger than a rate determined using a statistical model. The astrophysical impact of these two rates has been investigated through one-zone postprocessing type I x-ray burst calculations. We find that our new upper limit for the ${}^{30}$S($\alpha$,p)${}^{33}$Cl rate significantly affects the predicted nuclear energy generation rate during the burst.

   nucl-exPRC(2018)·13 citations
4. 04*

   Applications of Nuclear Physics

   Anna C. Hayes🇺🇸

   Today the applications of nuclear physics span a very broad range of topics and fields. This review discusses a number of aspects of these applications, including selected topics and concepts in nuclear reactor physics, nuclear fusion, nuclear non-proliferation, nuclear-geophysics, and nuclear medicine. The review begins with a historic summary of the early years in applied nuclear physics, with an emphasis on the huge developments that took place around the time of World War II, and that underlie the physics involved in designs of nuclear explosions, controlled nuclear energy, and nuclear fusion. The review then moves to focus on modern applications of these concepts, including the basic concepts and diagnostics developed for the forensics of nuclear explosions, the nuclear diagnostics at the National Ignition Facility, nuclear reactor safeguards, and the detection of nuclear material production and trafficking. The review also summarizes recent developments in nuclear geophysics and nuclear medicine. The nuclear geophysics areas discussed include geo-chronology, nuclear logging for industry, the Oklo reactor, and geo-neutrinos. The section on nuclear medicine summarizes the critical advances in nuclear imaging, including PET and SPECT imaging, targeted radionuclide therapy, and the nuclear physics of medical isotope production. Each subfield discussed requires a review article onto itself, which is not the intention of the current review. Rather, the current review is intended for readers who wish to get a broad understanding of applied nuclear physics.

   ↳ nucl-thnucl-exRept.Prog.Phys.(2017)·11 citations
5. 05*

   Reduced $E$1 $S$-factor of ${}^{12}$C($\alpha$,${\gamma }_0$)${}^{16}$O

   M. Katsuma

   The astrophysical $S$-factor of $E$1 transition for ${}^{12}$C($\alpha$,${\gamma }_0$)${}^{16}$O is discussed in the $R$-matrix theory. The reduced $\alpha$-particle widths of the 1${}_1^{-}$ ($E_x=7.12$ MeV) and 1${}_2^{-}$ ($E_x=9.59$ MeV) states are extracted from the result of the potential model. The formal parameters are obtained without the linear approximation to the shift function. The resultant $E$1 $S$-factor is not strongly enhanced by the subthreshold 1${}_1^{-}$ state if the channel radius is 4.75 fm. The calculated $\beta$-delayed $\alpha$-particle spectrum of ${}^{16}$N and the $p$-wave phase shift of $\alpha$+${}^{12}$C elastic scattering are also found to be consistent with the previous studies. The small channel radius leads to the low penetrability to the Coulomb barrier, and it makes the reduced $E$1 $S$-factor below the barrier. Owing to the large reduced width from the molecular structure, the $R$-matrix pole of the 1${}_2^{-}$ state is shifted in the vicinity of 1${}_1^{-}$. The proximity of the two poles suppresses the interference between the states. The transparency of the $\alpha$+${}^{12}$C system appears to be expressed as the shrinking strong interaction region.

   ↳ nucl-thastro-ph.SRnucl-ex2 citations
6. 06*

   Cryogenic magnetic coil and superconducting magnetic shield for neutron electric dipole moment searches

   S. Slutsky🇺🇸 · C. M. Swank🇺🇸 · A. Biswas🇺🇸 · R. Carr🇺🇸 · J. Escribano🇺🇸 · B. W. Filippone🇺🇸 · W. C. Griffith🇬🇧 · M. Mendenhall🇺🇸 · N. Nouri🇺🇸 · C. Osthelder🇺🇸 · A. Pérez Galván🇺🇸 · R. Picker🇺🇸 · B. Plaster🇺🇸

   A magnetic coil operated at cryogenic temperatures is used to produce spatial, relative field gradients below 6 ppm/cm, stable for several hours. The apparatus is a prototype of the magnetic components for a neutron electric dipole moment (nEDM) search, which will take place at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory using ultra-cold neutrons (UCN). That search requires a uniform magnetic field to mitigate systematic effects and obtain long polarization lifetimes for neutron spin precession measurements. This paper details upgrades to a previously described apparatus, particularly the introduction of super-conducting magnetic shielding and the associated cryogenic apparatus. The magnetic gradients observed are sufficiently low for the nEDM search at SNS.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2017)·8 citations
7. 07*

   Dilepton and $\varphi$ meson production in elementary and nuclear collisions at the NICA fixed target experiment

   Gy. Wolf \🇭🇺 · M. Zétényi🇭🇺

   We argue that the NICA fixed target experiment will be able to provide very important new experimental data on dilepton and $\varphi$ meson production in the basically undiscovered energy domain between the SIS and SPS energies. Experimental information about elementary cross sections in this energy region is an essential ingredient of models of nuclear collisions in the same energy range.

   ↳ nucl-thhep-exhep-phnucl-exEPJA(2016)·0 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.