Tue·Apr 12, 2016Tuesday·April 12, 2016

1. 01*

   Yields of Projectile Fragments in Sulphur-Emulsion Interactions at 3.7A GeV

   S. Kamel🇪🇬 · W. Osman🇪🇬 · M. Fayed🇪🇬

   This work presents the basic characteristics of singly, doubly and heavily charged projectile fragments (PFs) emitted in inelastic interactions of 32S ions with photo-emulsion nuclei at Dubna energy (3.7A GeV). Our experimental data are compared with the corresponding data for other projectiles at the same incident energy. The study of mean multiplicities of different charged PFs against the projectile mass shows a power-law relationship. The multiplicity distributions of singly and doubly charged PFs have been fitted well with a Gaussian distribution function. The yields of PFs broken up from the interactions of 32S projectile nuclei with different target nuclei are studied. The beam energy dependence in terms of the various order moments is studied as well.

   nucl-exhep-exCPC(2017)·1 citation
2. 02*

   Relativistic Kinematics

   Raghunath Sahoo🇮🇳

   This lecture note covers Relativistic Kinematics, which is very useful for the beginners in the field of high-energy physics. A very practical approach has been taken, which answers "why and how" of the kinematics useful for students working in the related areas.

   nucl-exhep-exhep-phnucl-thLect.Notes Phys.(2025)·19 citations
3. 03*

   Overview of recent ALICE results

   Taku Gunji (on behalf of the ALICE Collaboration)🇯🇵

   The ALICE experiment explores the properties of strongly interacting QCD matter at extremely high temperatures created in Pb-Pb collisions at LHC and provides further insight into small-system physics in (high-multiplicity) pp and p-Pb collisions. The ALICE collaboration presented 27 parallel talks, 50 posters, and 1 flash talk at Quark Matter 2015 and covered various topics including collective dynamics, correlations and fluctuations, heavy flavors, quarkonia, jets and high $p_{\mathrm{T}}$ hadrons, electromagnetic probes, small system physics, and the upgrade program. This paper highlights some of the selected results.

   nucl-exNPA(2016)·6 citations
4. 04*

   A new method of creating high intensity neutron source

   T. Masuda🇯🇵 · A. Yoshimi🇯🇵 · M. Yoshimura🇯🇵

   We propose a new scheme of producing intense neutron beam whose yields exceed those of existing facilities by many orders of magnitude. This scheme uses the recently proposed photon beam extracted from circulating quantum ions, which is directed to a deuteron target for photo-disintegration. The calculated neutron energy spectrum is nearly flat down to neV range, except a threshold rise and its adjacent wide structure. Hence, there exists a possibility of directly using sub-eV neutrons without a moderator. We shall have brief comments on promising particle physics applications using this large yield of neutron.

   nucl-exhep-exhep-phphysics.acc-ph+1IJMPE(2017)·0 citations
5. 05*

   Double-polarization observable G in neutral-pion photoproduction off the proton

   A. Thiel🇩🇪 · H. Eberhardt🇩🇪 · M. Lang🇩🇪 · F. Afzal🇩🇪 · A.V. Anisovich🇩🇪 · B. Bantes🇩🇪 · D. Bayadilov🇩🇪 · R. Beck🇩🇪 · M. Bichow🇩🇪 · K.-T. Brinkmann🇩🇪 · S. Böse🇩🇪 · V. Crede🇺🇸 and 60 other authors

   This paper reports on a measurement of the double-polarization observable G in ${\pi }^0$ photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The observable G is determined from reactions of linearly-polarized photons with longitudinally-polarized protons. The polarized photons are produced by bremsstrahlung off a properly oriented diamond radiator. A frozen spin butanol target provides the polarized protons. The data cover the photon energy range from 617 to 1325 MeV and a wide angular range. The experimental results for G are compared to predictions by the Bonn-Gatchina (BnGa), Jülich-Bonn (JüBo), MAID and SAID partial wave analyses. Implications of the new data for the pion photoproduction multipoles are discussed.

   nucl-exEPJA(2017)·33 citations
6. 06*

   Hammer events, neutrino energies, and nucleon-nucleon correlations

   L.B. Weinstein🇺🇸 · O. Hen🇺🇸 · E. Piasetzky🇮🇱

   Neutrino oscillation measurements depend on a difference between the rate of neutrino-nucleus interactions at different neutrino energies or different distances from the source. Knowledge of the neutrino energy spectrum and neutrino-detector interactions are crucial for these experiments. Short range nucleon-nucleon correlations in nuclei (SRC) affect properties of nuclei. The ArgoNeut liquid Argon Time Projection Chamber (lArTPC) observed neutrino-argon scattering events with two protons back-to-back in the final state ("hammer" events) which they associated with SRC pairs. The MicroBoone lArTPC will measure far more of these events. We simulate hammer events using two simple models. We use the well-known electron-nucleon cross section to calculate e-argon interactions where the e- scatters from a proton, ejecting a pi+, and the pi+ is then absorbed on a moving deuteron-like $np$ pair. We also use a model where the electron excites a nucleon to a Delta, which then deexcites by interacting with a second nucleon. The pion production model results in two protons very similar to those of the hammer events. These distributions are insensitive to the momentum of the $np$ pair that absorbed the $\pi$. The incident neutrino energy can be reconstructed from just the outgoing lepton. The Delta process results in two protons that are less similar to the observed events. ArgoNeut hammer events can be described by a simple pion production and reabsorption model. These hammer events in MicroBooNE can be used to determine the incident neutrino energy but not to learn about SRC. We suggest that this reaction channel could be used for neutrino oscillation experiments to complement other channels with higher statistics but different systematic uncertainties.

   ↳ hep-exnucl-exPRC(2016)·14 citations
7. 07*

   Multiplicities of charged pions and unidentified charged hadrons from deep-inelastic scattering of muons off an isoscalar target

   C. Adolph · J. Agarwala · M. Aghasyan · R. Akhunzyanov · M.G. Alexeev · G.D. Alexeev · A. Amoroso · V. Andrieux · N.V. Anfimov · V. Anosov · W. Augustyniak · A. Austregesilo and 216 other authors

   Multiplicities of charged pions and unidentified hadrons produced in deep-inelastic scattering were measured in bins of the Bjorken scaling variable $x$, the relative virtual-photon energy $y$ and the relative hadron energy $z$. Data were obtained by the COMPASS Collaboration using a 160 GeV muon beam and an isoscalar target (${}^6$LiD). They cover the kinematic domain in the photon virtuality $Q^2$ > 1(GeV/c${)}^2$, $0.004<x<0.4$, $0.2<z<0.85$ and $0.1<y<0.7$. In addition, a leading-order pQCD analysis was performed using the pion multiplicity results to extract quark fragmentation functions.

   ↳ hep-exnucl-exPLB(2017)·78 citations
8. 08*

   Thermal photon production from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions

   Alejandro Ayala🇲🇽 · Jorge David Castano-Yepes🇲🇽 · C. A. Dominguez🇿🇦 · L. A. Hernandez🇿🇦

   We compute the production of thermal photons in relativistic heavy-ion collisions by gluon fusion in the presence of an intense magnetic field, and during the early stages of the reaction. This photon yield is an excess over calculations that do not consider magnetic field effects. We add this excess to recent hydrodynamic calculations that are close to describing the experimental transverse momentum distribution in RHIC and LHC. We then show that with reasonable values for the temperature, magnetic field strength, and strong coupling constant, our results provide a very good description of such excess. These results support the idea that the origin of at least some of the photon excess observed in heavy-ion experiments may arise from magnetic field induced processes.

   ↳ hep-phhep-thnucl-exnucl-thEPJ Web Conf.(2017)·19 citations
9. 09*

   Ferro-deformation and shape coexistence over the nuclear chart: 28 < protons (Z) < 50 and 40 < neutrons (N) < 70

   Chang-Bum Moon

   With the experimental data at the national nuclear data center, NNDC, we investigate systematically the emerging nuclear structure properties in the first 2+ excited energies, E(2+) and their energy ratios to the first 4+ levels, R = E(4+)/E(2+) in the nuclei over 28 < Z < 50 for protons, and 40 < N < 70 for neutrons. By introducing the pseudo-shell configurations built on the combined subshells, we explain the following phenomena; a semi-double shell closure, a shape phase transition, and a reinforced deformation. The reinforced deformation arises suddenly at Z = 40 (or 38), N = 60 and approaches a maximum value, R = 3.3, as being centered at Z = 40, N = 64. We define this reinforced deformation 'a ferro-deformation', as in the previous study [arXiv:1604.01017]. The shape coexistence would be expected to be, as forming a ferro-deformation, with a strong rotational mode, and a near spherical shape, with a vibrational mode, in the transitional region at N = 58, 60, and 62 for the nuclei, with Z = 38 and 40; 96Sr, 98Sr, 100Sr, and 98Zr, 100Zr, and 102Zr. We suggest that the ferro-deformation should be closely associated with a strong spin-orbital interaction between neutrons in the g7/2 orbital and protons in the g9/2 orbital. Such an isospin dependent spin-orbital interaction, with the same angular momentum, l = 4, reinforces nuclear surface toward a sudden and dramatic deformation, giving rise to the ferro-deformation at the critical point, Z = 40, N = 64. We discuss the similarities and differences of the ferro-deformation between the two critical points; Z = 40, N = 64 and Z = 64, N = 104.

   ↳ nucl-thnucl-ex4 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.