Mon·Nov 24, 2014Monday·November 24, 2014

1. 01*

   Charge Topology of the Coherent Dissociation of Relativistic C-11 and N-12 Nuclei

   D.A. Artemenkov🇷🇺 · V. Bradnova🇷🇺 · A.A. Zaitsev🇷🇺 · P.I. Zarubin🇷🇺 · I.G. Zarubina🇷🇺 · R.R. Kattabekov🇷🇺 · N.K. Kornegrutsa · K.Z. Mamatkulov🇷🇺 · P.A. Rukoyatkin🇷🇺 · V.V. Rusakova🇷🇺 · R.Z. Stanoeva🇧🇬

   The charge topology of coherent-dissociation events is presented for ${}^{11}$C and ${}^{12}$N nuclei of energy 1.2~\textit{A}~GeV per nucleon bombarding nuclear track emulsions. This topology is compared with respective data for ${}^7$Be, ${}^{8,10}$B, ${}^{9,10}$C and ${}^{14}$N nuclei.

   nucl-exPhys.Atom.Nucl.(2015)·12 citations
2. 02*

   Jet transport and photon bremsstrahlung via longitudinal and transverse scattering

   Guang-You Qin🇨🇳 · Abhijit Majumder🇺🇸

   We study the effect of multiple scatterings on the propagation of hard partons and the production of jet-bremsstrahlung photons inside a dense medium in the framework of deep-inelastic scattering off a large nucleus. We include the momentum exchanges in both longitudinal and transverse directions between the hard partons and the constituents of the medium. Keeping up to the second order in a momentum gradient expansion, we derive the spectrum for the photon emission from a hard quark jet when traversing dense nuclear matter. Our calculation demonstrates that the photon bremsstrahlung process is influenced not only by the transverse momentum diffusion of the propagating hard parton, but also by the longitudinal drag and diffusion of the parton momentum. A notable outcome is that the longitudinal drag tends to reduce the amount of stimulated emission from the hard parton.

   ↳ nucl-thhep-phnucl-exPRC(2015)·19 citations
3. 03*

   Study of isospin nonconservation in the framework of spectral distribution theory

   Kamales Kar🇮🇳 · Sukhendusekhar Sarkar🇮🇳

   The observed isospin-symmetry breaking in light nuclei are caused not only by the Coulomb interaction but by the isovector one and two body plus isotensor two body nuclear interactions as well. Spectral distribution theory which treats nuclear spectroscopy and other structural properties in a statistical framework was earlier applied to isospin conserving Hamiltonians only. In this paper we extend that to include the nuclear interactions non-scalar in isospin and work out examples in sd shell to calculate the linear term in the isobaric mass-multiplet equation originating from these non-scalar parts.

   ↳ nucl-thnucl-exJ.Phys.G(2015)·3 citations
4. 04*

   Nuclear Electric Dipole Moments in Chiral Effective Field Theory

   J. Bsaisou🇩🇪 · J. de Vries🇩🇪 · C. Hanhart🇩🇪 · S. Liebig🇩🇪 · Ulf-G. Meißner🇩🇪 · D. Minossi🇩🇪 · A. Nogga🇩🇪 · A. Wirzba🇩🇪

   We provide a consistent and complete calculation of the electric dipole moments of the deuteron, helion, and triton in the framework of chiral effective field theory. The CP-conserving and CP-violating interactions are treated on equal footing and we consider CP-violating one-, two-, and three-nucleon operators up to next-to-leading-order in the chiral power counting. In particular, we calculate for the first time EDM contributions induced by the CP-violating three-pion operator. We find that effects of CP-violating nucleon-nucleon contact interactions are larger than those found in previous studies based on phenomenological models for the CP-conserving nucleon-nucleon interactions. Our results which apply to any model of CP violation in the hadronic sector can be used to test various scenarios of CP violation. As examples, we study the implications of our results on the QCD $\theta$-term and the minimal left-right symmetric model.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2015)·106 citations
5. 05*

   Cosmogenic activation of a natural tellurium target

   V. Lozza (1)🇩🇪 · J. Petzoldt (1 and 2) ((1) Institut fuer Kern und Teilchenphysik, Technische Universitaet Dresden, Germany (2) OncoRay, National Center for Radiation Research in Oncology, Germany)🇩🇪

   130Te is one of the candidates for the search for neutrinoless double beta decay. It is currently planned to be used in two experiments: CUORE and SNO+. In the CUORE experiment TeO2 crystals cooled at cryogenic temperatures will be used. In the SNO+ experiment natTe will be deployed up to 0.3% loading in the liquid scintillator volume. A possible background for the signal searched for, are the high Q-value, long-lived isotopes, produced by cosmogenic neutron and proton spallation reaction on the target material. A total of 18 isotopes with Q-value larger than 2 MeV and T1/2 >20 days have been identified as potential backgrounds. In addition low Q-value, high rate isotopes can be problematic due to pile-up effects, specially in liquid scintillator based detectors. Production rates have been calculated using the ACTIVIA program, the TENDL library, and the cosmogenic neutron and proton flux parametrization at sea level from Armstrong and Gehrels for both long and short lived isotopes. The obtained values for the cross sections are compared with the existing experimental data and calculations. Good agreement has been generally found. The results have been applied to the SNO+ experiment for one year of exposure at sea level. Two possible cases have been considered: a two years of cooling down period deep underground, or a first purification on surface and 6 months of cooling down deep underground. Deep underground activation at the SNOLAB location has been considered.

   ↳ physics.ins-dethep-exnucl-exAstropart.Phys.(2015)·31 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.